CVE-2024-20309

Device reset or hang via AUX traffic

Published Mar 27, 2024 · Updated Aug 9, 2024

Denial of service in Cisco IOS XE Software AUX functions allows local users to reset or hang affected devices through reverse Telnet. The AUX-port path incorrectly handles specific ingress data while hardware flow control is enabled, causing the device to reset or stop responding. Exploitation requires authenticated access to reverse Telnet into an AUX port with flowcontrol hardware enabled and either no attached hardware or a modem that keeps flow control off.

CVSS severity5.6
Medium
EPSS probability0.10%
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 AUX functions allows local users to reset or hang affected devices through reverse Telnet. The AUX-port path incorrectly handles specific ingress data while hardware flow control is enabled, causing the device to reset or stop responding. Exploitation requires authenticated access to reverse Telnet into an AUX port with flowcontrol hardware enabled and either no attached hardware or a modem that keeps flow control off.

The record

CVE
CVE-2024-20309
Published
Mar 27, 2024
Updated
Aug 9, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-828, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 9, 2024Record 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=16.1.1
  13. Affected versionversion=16.11.1
  14. Affected versionversion=16.11.1a
  15. Affected versionversion=16.11.1b
  16. Affected versionversion=16.11.1s
  17. Affected versionversion=16.11.2
  18. Affected versionversion=16.1.2
  19. Affected versionversion=16.12.1
  20. Affected versionversion=16.12.10
  21. Affected versionversion=16.12.10a
  22. Affected versionversion=16.12.1a
  23. Affected versionversion=16.12.1c
  24. Affected versionversion=16.12.1s
  25. Affected versionversion=16.12.1t
  26. Affected versionversion=16.12.1w
  27. Affected versionversion=16.12.1x
  28. Affected versionversion=16.12.1y
  29. Affected versionversion=16.12.1z1
  30. Affected versionversion=16.12.1z2
  31. Affected versionversion=16.12.2
  32. Affected versionversion=16.12.2a
  33. Affected versionversion=16.12.2s
  34. Affected versionversion=16.12.3
  35. Affected versionversion=16.12.3a
  36. Affected versionversion=16.12.3s
  37. Affected versionversion=16.12.4
  38. Affected versionversion=16.12.4a
  39. Affected versionversion=16.12.5
  40. Affected versionversion=16.12.5a
  41. Affected versionversion=16.12.5b
  42. Affected versionversion=16.12.6
  43. Affected versionversion=16.12.6a
  44. Affected versionversion=16.12.7
  45. Affected versionversion=16.12.8
  46. Affected versionversion=16.12.9
  47. Affected versionversion=16.1.3
  48. Affected versionversion=16.2.1
  49. Affected versionversion=16.2.2
  50. Affected versionversion=16.3.1
  51. Affected versionversion=16.3.10
  52. Affected versionversion=16.3.11
  53. Affected versionversion=16.3.1a
  54. Affected versionversion=16.3.2
  55. Affected versionversion=16.3.3
  56. Affected versionversion=16.3.4
  57. Affected versionversion=16.3.5
  58. Affected versionversion=16.3.5b
  59. Affected versionversion=16.3.6
  60. Affected versionversion=16.3.7
  61. Affected versionversion=16.3.8
  62. Affected versionversion=16.3.9
  63. Affected versionversion=16.4.1
  64. Affected versionversion=16.4.2
  65. Affected versionversion=16.4.3
  66. Affected versionversion=16.5.1
  67. Affected versionversion=16.5.1a
  68. Affected versionversion=16.5.1b
  69. Affected versionversion=16.5.2
  70. Affected versionversion=16.5.3
  71. Affected versionversion=16.6.1
  72. Affected versionversion=16.6.10
  73. Affected versionversion=16.6.2
  74. Affected versionversion=16.6.3
  75. Affected versionversion=16.6.4
  76. Affected versionversion=16.6.4a
  77. Affected versionversion=16.6.5
  78. Affected versionversion=16.6.5a
  79. Affected versionversion=16.6.6
  80. Affected versionversion=16.6.7
  81. Affected versionversion=16.6.8
  82. Affected versionversion=16.6.9
  83. Affected versionversion=16.7.1
  84. Affected versionversion=16.7.1a
  85. Affected versionversion=16.7.1b
  86. Affected versionversion=16.7.2
  87. Affected versionversion=16.7.3
  88. Affected versionversion=16.7.4
  89. Affected versionversion=16.8.1
  90. Affected versionversion=16.8.1a
  91. Affected versionversion=16.8.1b
  92. Affected versionversion=16.8.1c
  93. Affected versionversion=16.8.1d
  94. Affected versionversion=16.8.1e
  95. Affected versionversion=16.8.1s
  96. Affected versionversion=16.8.2
  97. Affected versionversion=16.8.3
  98. Affected versionversion=16.9.1
  99. Affected versionversion=16.9.1a
  100. Affected versionversion=16.9.1b
  101. Affected versionversion=16.9.1s
  102. Affected versionversion=16.9.2
  103. Affected versionversion=16.9.3
  104. Affected versionversion=16.9.3a
  105. Affected versionversion=16.9.4
  106. Affected versionversion=16.9.5
  107. Affected versionversion=16.9.5f
  108. Affected versionversion=16.9.6
  109. Affected versionversion=16.9.7
  110. Affected versionversion=16.9.8
  111. Affected versionversion=17.10.1
  112. Affected versionversion=17.10.1a
  113. Affected versionversion=17.10.1b
  114. Affected versionversion=17.1.1
  115. Affected versionversion=17.11.1
  116. Affected versionversion=17.11.1a
  117. Affected versionversion=17.11.99SW
  118. Affected versionversion=17.1.1a
  119. Affected versionversion=17.1.1s
  120. Affected versionversion=17.1.1t
  121. Affected versionversion=17.12.1
  122. Affected versionversion=17.12.1a
  123. Affected versionversion=17.12.1w
  124. Affected versionversion=17.12.2
  125. Affected versionversion=17.12.2a
  126. Affected versionversion=17.1.3
  127. Affected versionversion=17.2.1
  128. Affected versionversion=17.2.1a
  129. Affected versionversion=17.2.1r
  130. Affected versionversion=17.2.1v
  131. Affected versionversion=17.2.2
  132. Affected versionversion=17.2.3
  133. Affected versionversion=17.3.1
  134. Affected versionversion=17.3.1a
  135. Affected versionversion=17.3.1w
  136. Affected versionversion=17.3.1x
  137. Affected versionversion=17.3.1z
  138. Affected versionversion=17.3.2
  139. Affected versionversion=17.3.2a
  140. Affected versionversion=17.3.3
  141. Affected versionversion=17.3.4
  142. Affected versionversion=17.3.4a
  143. Affected versionversion=17.3.4b
  144. Affected versionversion=17.3.4c
  145. Affected versionversion=17.3.5
  146. Affected versionversion=17.3.5a
  147. Affected versionversion=17.3.5b
  148. Affected versionversion=17.3.6
  149. Affected versionversion=17.3.7
  150. Affected versionversion=17.3.8
  151. Affected versionversion=17.3.8a
  152. Affected versionversion=17.4.1
  153. Affected versionversion=17.4.1a
  154. Affected versionversion=17.4.1b
  155. Affected versionversion=17.4.2
  156. Affected versionversion=17.4.2a
  157. Affected versionversion=17.5.1
  158. Affected versionversion=17.5.1a
  159. Affected versionversion=17.6.1
  160. Affected versionversion=17.6.1a
  161. Affected versionversion=17.6.1w
  162. Affected versionversion=17.6.1x
  163. Affected versionversion=17.6.1y
  164. Affected versionversion=17.6.1z
  165. Affected versionversion=17.6.1z1
  166. Affected versionversion=17.6.2
  167. Affected versionversion=17.6.3
  168. Affected versionversion=17.6.3a
  169. Affected versionversion=17.6.4
  170. Affected versionversion=17.6.5
  171. Affected versionversion=17.6.5a
  172. Affected versionversion=17.6.6
  173. Affected versionversion=17.6.6a
  174. Affected versionversion=17.7.1
  175. Affected versionversion=17.7.1a
  176. Affected versionversion=17.7.1b
  177. Affected versionversion=17.7.2
  178. Affected versionversion=17.8.1
  179. Affected versionversion=17.8.1a
  180. Affected versionversion=17.9.1
  181. Affected versionversion=17.9.1a
  182. Affected versionversion=17.9.1w
  183. Affected versionversion=17.9.1x
  184. Affected versionversion=17.9.1x1
  185. Affected versionversion=17.9.1y
  186. Affected versionversion=17.9.1y1
  187. Affected versionversion=17.9.2
  188. Affected versionversion=17.9.2a
  189. Affected versionversion=17.9.3
  190. Affected versionversion=17.9.3a
  191. Affected versionversion=17.9.4
  192. Affected versionversion=17.9.4a
  193. Affected versionversion=3.10.0S
  194. Affected versionversion=3.10.10S
  195. Affected versionversion=3.10.1S
  196. Affected versionversion=3.10.1xbS
  197. Affected versionversion=3.10.2S
  198. Affected versionversion=3.10.2tS
  199. Affected versionversion=3.10.3S
  200. Affected versionversion=3.10.4S
  201. Affected versionversion=3.10.5S
  202. Affected versionversion=3.10.6S
  203. Affected versionversion=3.10.7S
  204. Affected versionversion=3.10.8aS
  205. Affected versionversion=3.10.8S
  206. Affected versionversion=3.10.9S
  207. Affected versionversion=3.11.0S
  208. Affected versionversion=3.11.1S
  209. Affected versionversion=3.11.2S
  210. Affected versionversion=3.11.3S
  211. Affected versionversion=3.11.4S
  212. Affected versionversion=3.12.0aS
  213. Affected versionversion=3.12.0S
  214. Affected versionversion=3.12.1S
  215. Affected versionversion=3.12.2S
  216. Affected versionversion=3.12.3S
  217. Affected versionversion=3.12.4S
  218. Affected versionversion=3.13.0aS
  219. Affected versionversion=3.13.0S
  220. Affected versionversion=3.13.10S
  221. Affected versionversion=3.13.1S
  222. Affected versionversion=3.13.2aS
  223. Affected versionversion=3.13.2S
  224. Affected versionversion=3.13.3S
  225. Affected versionversion=3.13.4S
  226. Affected versionversion=3.13.5aS
  227. Affected versionversion=3.13.5S
  228. Affected versionversion=3.13.6aS
  229. Affected versionversion=3.13.6S
  230. Affected versionversion=3.13.7aS
  231. Affected versionversion=3.13.7S
  232. Affected versionversion=3.13.8S
  233. Affected versionversion=3.13.9S
  234. Affected versionversion=3.14.0S
  235. Affected versionversion=3.14.1S
  236. Affected versionversion=3.14.2S
  237. Affected versionversion=3.14.3S
  238. Affected versionversion=3.14.4S
  239. Affected versionversion=3.15.0S
  240. Affected versionversion=3.15.1cS
  241. Affected versionversion=3.15.1S
  242. Affected versionversion=3.15.2S
  243. Affected versionversion=3.15.3S
  244. Affected versionversion=3.15.4S
  245. Affected versionversion=3.16.0cS
  246. Affected versionversion=3.16.0S
  247. Affected versionversion=3.16.10S
  248. Affected versionversion=3.16.1aS
  249. Affected versionversion=3.16.1S
  250. Affected versionversion=3.16.2aS
  251. Affected versionversion=3.16.2bS
  252. Affected versionversion=3.16.2S
  253. Affected versionversion=3.16.3aS
  254. Affected versionversion=3.16.3S
  255. Affected versionversion=3.16.4aS
  256. Affected versionversion=3.16.4bS
  257. Affected versionversion=3.16.4dS
  258. Affected versionversion=3.16.4S
  259. Affected versionversion=3.16.5S
  260. Affected versionversion=3.16.6bS
  261. Affected versionversion=3.16.6S
  262. Affected versionversion=3.16.7aS
  263. Affected versionversion=3.16.7bS
  264. Affected versionversion=3.16.7S
  265. Affected versionversion=3.16.8S
  266. Affected versionversion=3.16.9S
  267. Affected versionversion=3.17.0S
  268. Affected versionversion=3.17.1aS
  269. Affected versionversion=3.17.1S
  270. Affected versionversion=3.17.2S
  271. Affected versionversion=3.17.3S
  272. Affected versionversion=3.17.4S
  273. Affected versionversion=3.18.0aS
  274. Affected versionversion=3.18.0S
  275. Affected versionversion=3.18.0SP
  276. Affected versionversion=3.18.1aSP
  277. Affected versionversion=3.18.1bSP
  278. Affected versionversion=3.18.1cSP
  279. Affected versionversion=3.18.1S
  280. Affected versionversion=3.18.1SP
  281. Affected versionversion=3.18.2aSP
  282. Affected versionversion=3.18.2S
  283. Affected versionversion=3.18.2SP
  284. Affected versionversion=3.18.3aSP
  285. Affected versionversion=3.18.3bSP
  286. Affected versionversion=3.18.3S
  287. Affected versionversion=3.18.3SP
  288. Affected versionversion=3.18.4S
  289. Affected versionversion=3.18.4SP
  290. Affected versionversion=3.18.5SP
  291. Affected versionversion=3.18.6SP
  292. Affected versionversion=3.18.7SP
  293. Affected versionversion=3.18.8aSP
  294. Affected versionversion=3.18.9SP
  295. Affected versionversion=3.2.0SE
  296. Affected versionversion=3.2.1SE
  297. Affected versionversion=3.2.2SE
  298. Affected versionversion=3.2.3SE
  299. Affected versionversion=3.3.0SE
  300. Affected versionversion=3.3.0SQ
  301. Affected versionversion=3.3.1SE
  302. Affected versionversion=3.3.1SQ
  303. Affected versionversion=3.3.2SE
  304. Affected versionversion=3.3.3SE
  305. Affected versionversion=3.3.4SE
  306. Affected versionversion=3.3.5SE
  307. Affected versionversion=3.4.0SQ
  308. Affected versionversion=3.4.1SQ
  309. Affected versionversion=3.5.0SQ
  310. Affected versionversion=3.5.1SQ
  311. Affected versionversion=3.5.2SQ
  312. Affected versionversion=3.5.3SQ
  313. Affected versionversion=3.5.4SQ
  314. Affected versionversion=3.5.5SQ
  315. Affected versionversion=3.5.6SQ
  316. Affected versionversion=3.5.7SQ
  317. Affected versionversion=3.5.8SQ
  318. Affected versionversion=3.6.10E
  319. Affected versionversion=3.6.2aE
  320. Affected versionversion=3.6.2E
  321. Affected versionversion=3.6.5bE
  322. Affected versionversion=3.6.7bE
  323. Affected versionversion=3.6.9E
  324. Affected versionversion=3.7.0bS
  325. Affected versionversion=3.7.0S
  326. Affected versionversion=3.7.1aS
  327. Affected versionversion=3.7.1S
  328. Affected versionversion=3.7.2S
  329. Affected versionversion=3.7.2tS
  330. Affected versionversion=3.7.3S
  331. Affected versionversion=3.7.4aS
  332. Affected versionversion=3.7.4S
  333. Affected versionversion=3.7.5S
  334. Affected versionversion=3.7.6S
  335. Affected versionversion=3.7.7S
  336. Affected versionversion=3.8.0S
  337. Affected versionversion=3.8.1S
  338. Affected versionversion=3.8.2S
  339. Affected versionversion=3.9.0aS
  340. Affected versionversion=3.9.0S
  341. Affected versionversion=3.9.1aS
  342. Affected versionversion=3.9.1S
  343. Affected versionversion=3.9.2S

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=16.1.1; version=16.11.1; version=16.11.1a; version=16.11.1b; version=16.11.1s; version=16.11.2; version=16.1.2; version=16.12.1; version=16.12.10; version=16.12.10a; 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=16.1.3; version=16.2.1; version=16.2.2; version=16.3.1; version=16.3.10; version=16.3.11; version=16.3.1a; version=16.3.2; version=16.3.3; version=16.3.4; version=16.3.5; version=16.3.5b; version=16.3.6; version=16.3.7; version=16.3.8; version=16.3.9; version=16.4.1; version=16.4.2; version=16.4.3; version=16.5.1; version=16.5.1a; version=16.5.1b; version=16.5.2; version=16.5.3; 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=17.11.99SW; 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=17.12.2; version=17.12.2a; version=17.1.3; 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=17.7.1; 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=3.10.0S; version=3.10.10S; version=3.10.1S; version=3.10.1xbS; version=3.10.2S; version=3.10.2tS; version=3.10.3S; version=3.10.4S; version=3.10.5S; version=3.10.6S; version=3.10.7S; version=3.10.8aS; version=3.10.8S; version=3.10.9S; 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=3.13.10S; 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=3.13.7aS; version=3.13.7S; version=3.13.8S; version=3.13.9S; version=3.14.0S; version=3.14.1S; version=3.14.2S; 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Published CVSS scores

5.6CiscoCVSS:3.1/AV:L/AC:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-828Signal Handler with Functionality that is not Asynchronous-Safe
T1499.004Application or System Exploitation

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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