CVE-2026-20083

Device reload via malformed SCP request

Published Mar 25, 2026 · Updated Mar 25, 2026

Denial of service in Cisco IOS XE Software's SCP server allows local users with low privileges to reload affected devices through SSH. The SCP server improperly handles a malformed SCP request carried by a crafted SSH command instead of rejecting it. The SCP server must be enabled, and successful exploitation unexpectedly reloads the device, interrupting network service.

CVSS severity6.5
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco IOS XE Software's SCP server allows local users with low privileges to reload affected devices through SSH. The SCP server improperly handles a malformed SCP request carried by a crafted SSH command instead of rejecting it. The SCP server must be enabled, and successful exploitation unexpectedly reloads the device, interrupting network service.

The record

CVE
CVE-2026-20083
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-235, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.10.1
  2. Affected versionversion=16.10.1a
  3. Affected versionversion=16.10.1b
  4. Affected versionversion=16.10.1c
  5. Affected versionversion=16.10.1d
  6. Affected versionversion=16.10.1e
  7. Affected versionversion=16.10.1f
  8. Affected versionversion=16.10.1g
  9. Affected versionversion=16.10.1s
  10. Affected versionversion=16.10.2
  11. Affected versionversion=16.10.3
  12. Affected versionversion=16.11.1
  13. Affected versionversion=16.11.1a
  14. Affected versionversion=16.11.1b
  15. Affected versionversion=16.11.1s
  16. Affected versionversion=16.11.2
  17. Affected versionversion=16.12.1
  18. Affected versionversion=16.12.10
  19. Affected versionversion=16.12.10a
  20. Affected versionversion=16.12.11
  21. Affected versionversion=16.12.12
  22. Affected versionversion=16.12.13
  23. Affected versionversion=16.12.14
  24. Affected versionversion=16.12.1a
  25. Affected versionversion=16.12.1c
  26. Affected versionversion=16.12.1s
  27. Affected versionversion=16.12.1t
  28. Affected versionversion=16.12.1w
  29. Affected versionversion=16.12.1x
  30. Affected versionversion=16.12.1y
  31. Affected versionversion=16.12.1z1
  32. Affected versionversion=16.12.1z2
  33. Affected versionversion=16.12.2
  34. Affected versionversion=16.12.2a
  35. Affected versionversion=16.12.2s
  36. Affected versionversion=16.12.3
  37. Affected versionversion=16.12.3a
  38. Affected versionversion=16.12.3s
  39. Affected versionversion=16.12.4
  40. Affected versionversion=16.12.4a
  41. Affected versionversion=16.12.5
  42. Affected versionversion=16.12.5a
  43. Affected versionversion=16.12.5b
  44. Affected versionversion=16.12.6
  45. Affected versionversion=16.12.6a
  46. Affected versionversion=16.12.7
  47. Affected versionversion=16.12.8
  48. Affected versionversion=16.12.9
  49. Affected versionversion=16.6.1
  50. Affected versionversion=16.6.10
  51. Affected versionversion=16.6.2
  52. Affected versionversion=16.6.3
  53. Affected versionversion=16.6.4
  54. Affected versionversion=16.6.4a
  55. Affected versionversion=16.6.5
  56. Affected versionversion=16.6.5a
  57. Affected versionversion=16.6.6
  58. Affected versionversion=16.6.7
  59. Affected versionversion=16.6.8
  60. Affected versionversion=16.6.9
  61. Affected versionversion=16.7.1
  62. Affected versionversion=16.7.1a
  63. Affected versionversion=16.7.1b
  64. Affected versionversion=16.7.2
  65. Affected versionversion=16.7.3
  66. Affected versionversion=16.7.4
  67. Affected versionversion=16.8.1
  68. Affected versionversion=16.8.1a
  69. Affected versionversion=16.8.1b
  70. Affected versionversion=16.8.1c
  71. Affected versionversion=16.8.1d
  72. Affected versionversion=16.8.1e
  73. Affected versionversion=16.8.1s
  74. Affected versionversion=16.8.2
  75. Affected versionversion=16.8.3
  76. Affected versionversion=16.9.1
  77. Affected versionversion=16.9.1a
  78. Affected versionversion=16.9.1b
  79. Affected versionversion=16.9.1s
  80. Affected versionversion=16.9.2
  81. Affected versionversion=16.9.3
  82. Affected versionversion=16.9.3a
  83. Affected versionversion=16.9.4
  84. Affected versionversion=16.9.5
  85. Affected versionversion=16.9.5f
  86. Affected versionversion=16.9.6
  87. Affected versionversion=16.9.7
  88. Affected versionversion=16.9.8
  89. Affected versionversion=17.10.1
  90. Affected versionversion=17.10.1a
  91. Affected versionversion=17.10.1b
  92. Affected versionversion=17.1.1
  93. Affected versionversion=17.11.1
  94. Affected versionversion=17.11.1a
  95. Affected versionversion=17.1.1a
  96. Affected versionversion=17.1.1s
  97. Affected versionversion=17.1.1t
  98. Affected versionversion=17.12.1
  99. Affected versionversion=17.12.1a
  100. Affected versionversion=17.12.1w
  101. Affected versionversion=17.12.1x
  102. Affected versionversion=17.12.1y
  103. Affected versionversion=17.12.1z
  104. Affected versionversion=17.12.1z1
  105. Affected versionversion=17.12.1z2
  106. Affected versionversion=17.12.1z3
  107. Affected versionversion=17.12.1z4
  108. Affected versionversion=17.12.2
  109. Affected versionversion=17.12.2a
  110. Affected versionversion=17.12.3
  111. Affected versionversion=17.12.3a
  112. Affected versionversion=17.12.4
  113. Affected versionversion=17.12.4a
  114. Affected versionversion=17.12.4b
  115. Affected versionversion=17.12.5
  116. Affected versionversion=17.12.5a
  117. Affected versionversion=17.12.5b
  118. Affected versionversion=17.12.5c
  119. Affected versionversion=17.12.5d
  120. Affected versionversion=17.12.6
  121. Affected versionversion=17.12.6a
  122. Affected versionversion=17.12.6b
  123. Affected versionversion=17.1.3
  124. Affected versionversion=17.13.1
  125. Affected versionversion=17.13.1a
  126. Affected versionversion=17.14.1
  127. Affected versionversion=17.14.1a
  128. Affected versionversion=17.15.1
  129. Affected versionversion=17.15.1a
  130. Affected versionversion=17.15.1b
  131. Affected versionversion=17.15.1w
  132. Affected versionversion=17.15.1x
  133. Affected versionversion=17.15.1y
  134. Affected versionversion=17.15.1z
  135. Affected versionversion=17.15.2
  136. Affected versionversion=17.15.2a
  137. Affected versionversion=17.15.2b
  138. Affected versionversion=17.15.2c
  139. Affected versionversion=17.15.3
  140. Affected versionversion=17.15.3a
  141. Affected versionversion=17.15.3b
  142. Affected versionversion=17.15.4
  143. Affected versionversion=17.15.4d
  144. Affected versionversion=17.15.4e
  145. Affected versionversion=17.16.1
  146. Affected versionversion=17.16.1a
  147. Affected versionversion=17.17.1
  148. Affected versionversion=17.18.1
  149. Affected versionversion=17.18.1a
  150. Affected versionversion=17.18.1w
  151. Affected versionversion=17.2.1
  152. Affected versionversion=17.2.1a
  153. Affected versionversion=17.2.1r
  154. Affected versionversion=17.2.1v
  155. Affected versionversion=17.2.2
  156. Affected versionversion=17.2.3
  157. Affected versionversion=17.3.1
  158. Affected versionversion=17.3.1a
  159. Affected versionversion=17.3.1w
  160. Affected versionversion=17.3.1x
  161. Affected versionversion=17.3.1z
  162. Affected versionversion=17.3.2
  163. Affected versionversion=17.3.2a
  164. Affected versionversion=17.3.3
  165. Affected versionversion=17.3.4
  166. Affected versionversion=17.3.4a
  167. Affected versionversion=17.3.4b
  168. Affected versionversion=17.3.4c
  169. Affected versionversion=17.3.5
  170. Affected versionversion=17.3.5a
  171. Affected versionversion=17.3.5b
  172. Affected versionversion=17.3.6
  173. Affected versionversion=17.3.7
  174. Affected versionversion=17.3.8
  175. Affected versionversion=17.3.8a
  176. Affected versionversion=17.4.1
  177. Affected versionversion=17.4.1a
  178. Affected versionversion=17.4.1b
  179. Affected versionversion=17.4.2
  180. Affected versionversion=17.4.2a
  181. Affected versionversion=17.5.1
  182. Affected versionversion=17.5.1a
  183. Affected versionversion=17.6.1
  184. Affected versionversion=17.6.1a
  185. Affected versionversion=17.6.1w
  186. Affected versionversion=17.6.1x
  187. Affected versionversion=17.6.1y
  188. Affected versionversion=17.6.1z
  189. Affected versionversion=17.6.1z1
  190. Affected versionversion=17.6.2
  191. Affected versionversion=17.6.3
  192. Affected versionversion=17.6.3a
  193. Affected versionversion=17.6.4
  194. Affected versionversion=17.6.5
  195. Affected versionversion=17.6.5a
  196. Affected versionversion=17.6.6
  197. Affected versionversion=17.6.6a
  198. Affected versionversion=17.6.7
  199. Affected versionversion=17.6.8
  200. Affected versionversion=17.6.8a
  201. Affected versionversion=17.7.1
  202. Affected versionversion=17.7.1a
  203. Affected versionversion=17.7.1b
  204. Affected versionversion=17.7.2
  205. Affected versionversion=17.8.1
  206. Affected versionversion=17.8.1a
  207. Affected versionversion=17.9.1
  208. Affected versionversion=17.9.1a
  209. Affected versionversion=17.9.1w
  210. Affected versionversion=17.9.1x
  211. Affected versionversion=17.9.1x1
  212. Affected versionversion=17.9.1y
  213. Affected versionversion=17.9.1y1
  214. Affected versionversion=17.9.2
  215. Affected versionversion=17.9.2a
  216. Affected versionversion=17.9.3
  217. Affected versionversion=17.9.3a
  218. Affected versionversion=17.9.4
  219. Affected versionversion=17.9.4a
  220. Affected versionversion=17.9.5
  221. Affected versionversion=17.9.5a
  222. Affected versionversion=17.9.5b
  223. Affected versionversion=17.9.5e
  224. Affected versionversion=17.9.5f
  225. Affected versionversion=17.9.6
  226. Affected versionversion=17.9.6a
  227. Affected versionversion=17.9.7
  228. Affected versionversion=17.9.7a
  229. Affected versionversion=17.9.7b
  230. Affected versionversion=17.9.8
  231. Affected versionversion=3.11.0S
  232. Affected versionversion=3.11.1S
  233. Affected versionversion=3.11.2S
  234. Affected versionversion=3.11.3S
  235. Affected versionversion=3.11.4S
  236. Affected versionversion=3.12.0aS
  237. Affected versionversion=3.12.0S
  238. Affected versionversion=3.12.1S
  239. Affected versionversion=3.12.2S
  240. Affected versionversion=3.12.3S
  241. Affected versionversion=3.12.4S
  242. Affected versionversion=3.13.0aS
  243. Affected versionversion=3.13.0S
  244. Affected versionversion=3.13.1S
  245. Affected versionversion=3.13.2aS
  246. Affected versionversion=3.13.2S
  247. Affected versionversion=3.13.3S
  248. Affected versionversion=3.13.4S
  249. Affected versionversion=3.13.5aS
  250. Affected versionversion=3.13.5S
  251. Affected versionversion=3.13.6aS
  252. Affected versionversion=3.13.6S
  253. Affected versionversion=3.13.7S
  254. Affected versionversion=3.14.0S
  255. Affected versionversion=3.14.1S
  256. Affected versionversion=3.14.2S
  257. Affected versionversion=3.14.3S
  258. Affected versionversion=3.14.4S
  259. Affected versionversion=3.15.0S
  260. Affected versionversion=3.15.1cS
  261. Affected versionversion=3.15.1S
  262. Affected versionversion=3.15.2S
  263. Affected versionversion=3.15.3S
  264. Affected versionversion=3.15.4S
  265. Affected versionversion=3.16.0cS
  266. Affected versionversion=3.16.0S
  267. Affected versionversion=3.16.1aS
  268. Affected versionversion=3.16.1S
  269. Affected versionversion=3.16.2aS
  270. Affected versionversion=3.16.2bS
  271. Affected versionversion=3.16.2S
  272. Affected versionversion=3.16.3aS
  273. Affected versionversion=3.16.3S
  274. Affected versionversion=3.16.4aS
  275. Affected versionversion=3.16.4bS
  276. Affected versionversion=3.16.4dS
  277. Affected versionversion=3.16.4S
  278. Affected versionversion=3.16.5S
  279. Affected versionversion=3.17.0S
  280. Affected versionversion=3.17.1aS
  281. Affected versionversion=3.17.1S
  282. Affected versionversion=3.17.2S
  283. Affected versionversion=3.17.3S
  284. Affected versionversion=3.18.0aS
  285. Affected versionversion=3.18.0S
  286. Affected versionversion=3.18.0SP
  287. Affected versionversion=3.18.1aSP
  288. Affected versionversion=3.18.1bSP
  289. Affected versionversion=3.18.1cSP
  290. Affected versionversion=3.18.1S
  291. Affected versionversion=3.18.1SP
  292. Affected versionversion=3.18.2S
  293. Affected versionversion=3.5.0E
  294. Affected versionversion=3.5.1E
  295. Affected versionversion=3.5.2E
  296. Affected versionversion=3.5.3E
  297. Affected versionversion=3.6.0E
  298. Affected versionversion=3.6.1E
  299. Affected versionversion=3.6.2aE
  300. Affected versionversion=3.6.2E
  301. Affected versionversion=3.6.3E
  302. Affected versionversion=3.6.4E
  303. Affected versionversion=3.6.5aE
  304. Affected versionversion=3.6.5E
  305. Affected versionversion=3.6.6E
  306. Affected versionversion=3.7.0E
  307. Affected versionversion=3.7.1E
  308. Affected versionversion=3.7.2E
  309. Affected versionversion=3.7.3E
  310. Affected versionversion=3.7.4E
  311. Affected versionversion=3.7.5E
  312. Affected versionversion=3.8.0E
  313. Affected versionversion=3.8.1E
  314. Affected versionversion=3.8.2E
  315. Affected versionversion=3.8.3E
  316. Affected versionversion=3.9.0E
  317. Affected versionversion=3.9.1E

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=16.10.1; version=16.10.1a; version=16.10.1b; version=16.10.1c; version=16.10.1d; version=16.10.1e; version=16.10.1f; version=16.10.1g; version=16.10.1s; version=16.10.2; version=16.10.3; version=16.11.1; version=16.11.1a; version=16.11.1b; version=16.11.1s; version=16.11.2; version=16.12.1; version=16.12.10; version=16.12.10a; version=16.12.11; version=16.12.12; version=16.12.13; version=16.12.14; version=16.12.1a; version=16.12.1c; version=16.12.1s; version=16.12.1t; version=16.12.1w; version=16.12.1x; version=16.12.1y; version=16.12.1z1; version=16.12.1z2; version=16.12.2; version=16.12.2a; version=16.12.2s; version=16.12.3; version=16.12.3a; version=16.12.3s; version=16.12.4; version=16.12.4a; version=16.12.5; version=16.12.5a; version=16.12.5b; version=16.12.6; version=16.12.6a; version=16.12.7; version=16.12.8; version=16.12.9; version=16.6.1; version=16.6.10; version=16.6.2; version=16.6.3; version=16.6.4; version=16.6.4a; version=16.6.5; version=16.6.5a; version=16.6.6; version=16.6.7; version=16.6.8; version=16.6.9; version=16.7.1; version=16.7.1a; version=16.7.1b; version=16.7.2; version=16.7.3; version=16.7.4; version=16.8.1; version=16.8.1a; version=16.8.1b; version=16.8.1c; version=16.8.1d; version=16.8.1e; version=16.8.1s; version=16.8.2; version=16.8.3; version=16.9.1; version=16.9.1a; version=16.9.1b; version=16.9.1s; version=16.9.2; version=16.9.3; version=16.9.3a; version=16.9.4; version=16.9.5; version=16.9.5f; version=16.9.6; version=16.9.7; version=16.9.8; version=17.10.1; version=17.10.1a; version=17.10.1b; version=17.1.1; version=17.11.1; version=17.11.1a; version=17.1.1a; version=17.1.1s; version=17.1.1t; version=17.12.1; version=17.12.1a; version=17.12.1w; version=17.12.1x; version=17.12.1y; version=17.12.1z; version=17.12.1z1; version=17.12.1z2; version=17.12.1z3; version=17.12.1z4; version=17.12.2; version=17.12.2a; version=17.12.3; version=17.12.3a; version=17.12.4; version=17.12.4a; version=17.12.4b; version=17.12.5; version=17.12.5a; version=17.12.5b; version=17.12.5c; version=17.12.5d; version=17.12.6; version=17.12.6a; version=17.12.6b; version=17.1.3; version=17.13.1; version=17.13.1a; version=17.14.1; version=17.14.1a; version=17.15.1; version=17.15.1a; version=17.15.1b; version=17.15.1w; version=17.15.1x; version=17.15.1y; version=17.15.1z; version=17.15.2; version=17.15.2a; version=17.15.2b; version=17.15.2c; version=17.15.3; version=17.15.3a; version=17.15.3b; version=17.15.4; version=17.15.4d; version=17.15.4e; version=17.16.1; version=17.16.1a; version=17.17.1; version=17.18.1; version=17.18.1a; version=17.18.1w; version=17.2.1; version=17.2.1a; version=17.2.1r; version=17.2.1v; version=17.2.2; version=17.2.3; version=17.3.1; version=17.3.1a; version=17.3.1w; version=17.3.1x; version=17.3.1z; version=17.3.2; version=17.3.2a; version=17.3.3; version=17.3.4; version=17.3.4a; version=17.3.4b; version=17.3.4c; version=17.3.5; version=17.3.5a; version=17.3.5b; version=17.3.6; version=17.3.7; version=17.3.8; version=17.3.8a; version=17.4.1; version=17.4.1a; version=17.4.1b; version=17.4.2; version=17.4.2a; version=17.5.1; version=17.5.1a; version=17.6.1; version=17.6.1a; version=17.6.1w; version=17.6.1x; version=17.6.1y; version=17.6.1z; version=17.6.1z1; version=17.6.2; version=17.6.3; version=17.6.3a; version=17.6.4; version=17.6.5; version=17.6.5a; version=17.6.6; version=17.6.6a; version=17.6.7; version=17.6.8; version=17.6.8a; version=17.7.1; version=17.7.1a; version=17.7.1b; version=17.7.2; version=17.8.1; version=17.8.1a; version=17.9.1; version=17.9.1a; version=17.9.1w; version=17.9.1x; version=17.9.1x1; version=17.9.1y; version=17.9.1y1; version=17.9.2; version=17.9.2a; version=17.9.3; version=17.9.3a; version=17.9.4; version=17.9.4a; version=17.9.5; version=17.9.5a; version=17.9.5b; version=17.9.5e; version=17.9.5f; version=17.9.6; version=17.9.6a; version=17.9.7; version=17.9.7a; version=17.9.7b; version=17.9.8; version=3.11.0S; version=3.11.1S; version=3.11.2S; version=3.11.3S; version=3.11.4S; version=3.12.0aS; version=3.12.0S; version=3.12.1S; version=3.12.2S; version=3.12.3S; version=3.12.4S; version=3.13.0aS; version=3.13.0S; version=3.13.1S; version=3.13.2aS; version=3.13.2S; version=3.13.3S; version=3.13.4S; version=3.13.5aS; version=3.13.5S; version=3.13.6aS; version=3.13.6S; version=3.13.7S; version=3.14.0S; version=3.14.1S; version=3.14.2S; version=3.14.3S; version=3.14.4S; version=3.15.0S; version=3.15.1cS; version=3.15.1S; version=3.15.2S; version=3.15.3S; version=3.15.4S; version=3.16.0cS; version=3.16.0S; version=3.16.1aS; version=3.16.1S; version=3.16.2aS; version=3.16.2bS; version=3.16.2S; version=3.16.3aS; version=3.16.3S; version=3.16.4aS; version=3.16.4bS; version=3.16.4dS; version=3.16.4S; version=3.16.5S; version=3.17.0S; version=3.17.1aS; version=3.17.1S; version=3.17.2S; version=3.17.3S; version=3.18.0aS; version=3.18.0S; version=3.18.0SP; version=3.18.1aSP; version=3.18.1bSP; version=3.18.1cSP; version=3.18.1S; version=3.18.1SP; version=3.18.2S; version=3.5.0E; version=3.5.1E; version=3.5.2E; version=3.5.3E; version=3.6.0E; version=3.6.1E; version=3.6.2aE; version=3.6.2E; version=3.6.3E; version=3.6.4E; version=3.6.5aE; version=3.6.5E; version=3.6.6E; version=3.7.0E; version=3.7.1E; version=3.7.2E; version=3.7.3E; version=3.7.4E; version=3.7.5E; version=3.8.0E; version=3.8.1E; version=3.8.2E; version=3.8.3E; version=3.9.0E; version=3.9.1E

Published CVSS scores

6.5Cisco Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-235Improper Handling of Extra Parameters
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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