CVE-2025-20189

Adjacent RSP reload via crafted ARP flood

Published May 7, 2025 · Updated May 7, 2025

Denial of service in Cisco IOS XE Software on ASR 903 routers with RSP3C allows attackers to reload the active RSP via ARP traffic. Cisco Express Forwarding mishandles memory while processing a sustained high rate of crafted ARP messages, allowing the uea_mgr process to exhaust resources. Reachability requires Layer 2 adjacency; the active RSP reloads near critical memory use, and without a redundant RSP the entire router reloads.

CVSS severity7.4
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Cisco IOS XE Software on ASR 903 routers with RSP3C allows attackers to reload the active RSP via ARP traffic. Cisco Express Forwarding mishandles memory while processing a sustained high rate of crafted ARP messages, allowing the uea_mgr process to exhaust resources. Reachability requires Layer 2 adjacency; the active RSP reloads near critical memory use, and without a redundant RSP the entire router reloads.

The record

CVE
CVE-2025-20189
Published
May 7, 2025
Updated
May 7, 2025
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-762, T1498.001
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 7, 2025CVE publishedPublication date reported by the CVE source.
  2. May 7, 2025Record 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=16.12.11
  23. Affected versionversion=16.12.12
  24. Affected versionversion=16.12.13
  25. Affected versionversion=16.12.1a
  26. Affected versionversion=16.12.1c
  27. Affected versionversion=16.12.1s
  28. Affected versionversion=16.12.1t
  29. Affected versionversion=16.12.1w
  30. Affected versionversion=16.12.1x
  31. Affected versionversion=16.12.1y
  32. Affected versionversion=16.12.1z1
  33. Affected versionversion=16.12.1z2
  34. Affected versionversion=16.12.2
  35. Affected versionversion=16.12.2a
  36. Affected versionversion=16.12.2s
  37. Affected versionversion=16.12.3
  38. Affected versionversion=16.12.3a
  39. Affected versionversion=16.12.3s
  40. Affected versionversion=16.12.4
  41. Affected versionversion=16.12.4a
  42. Affected versionversion=16.12.5
  43. Affected versionversion=16.12.5a
  44. Affected versionversion=16.12.5b
  45. Affected versionversion=16.12.6
  46. Affected versionversion=16.12.6a
  47. Affected versionversion=16.12.7
  48. Affected versionversion=16.12.8
  49. Affected versionversion=16.12.9
  50. Affected versionversion=16.1.3
  51. Affected versionversion=16.2.1
  52. Affected versionversion=16.2.2
  53. Affected versionversion=16.3.1
  54. Affected versionversion=16.3.10
  55. Affected versionversion=16.3.11
  56. Affected versionversion=16.3.1a
  57. Affected versionversion=16.3.2
  58. Affected versionversion=16.3.3
  59. Affected versionversion=16.3.4
  60. Affected versionversion=16.3.5
  61. Affected versionversion=16.3.5b
  62. Affected versionversion=16.3.6
  63. Affected versionversion=16.3.7
  64. Affected versionversion=16.3.8
  65. Affected versionversion=16.3.9
  66. Affected versionversion=16.4.1
  67. Affected versionversion=16.4.2
  68. Affected versionversion=16.4.3
  69. Affected versionversion=16.5.1
  70. Affected versionversion=16.5.1a
  71. Affected versionversion=16.5.1b
  72. Affected versionversion=16.5.2
  73. Affected versionversion=16.5.3
  74. Affected versionversion=16.6.1
  75. Affected versionversion=16.6.10
  76. Affected versionversion=16.6.2
  77. Affected versionversion=16.6.3
  78. Affected versionversion=16.6.4
  79. Affected versionversion=16.6.4a
  80. Affected versionversion=16.6.5
  81. Affected versionversion=16.6.5a
  82. Affected versionversion=16.6.6
  83. Affected versionversion=16.6.7
  84. Affected versionversion=16.6.8
  85. Affected versionversion=16.6.9
  86. Affected versionversion=16.7.1
  87. Affected versionversion=16.7.1a
  88. Affected versionversion=16.7.1b
  89. Affected versionversion=16.7.2
  90. Affected versionversion=16.7.3
  91. Affected versionversion=16.7.4
  92. Affected versionversion=16.8.1
  93. Affected versionversion=16.8.1a
  94. Affected versionversion=16.8.1b
  95. Affected versionversion=16.8.1c
  96. Affected versionversion=16.8.1d
  97. Affected versionversion=16.8.1e
  98. Affected versionversion=16.8.1s
  99. Affected versionversion=16.8.2
  100. Affected versionversion=16.8.3
  101. Affected versionversion=16.9.1
  102. Affected versionversion=16.9.1a
  103. Affected versionversion=16.9.1b
  104. Affected versionversion=16.9.1s
  105. Affected versionversion=16.9.2
  106. Affected versionversion=16.9.3
  107. Affected versionversion=16.9.3a
  108. Affected versionversion=16.9.4
  109. Affected versionversion=16.9.5
  110. Affected versionversion=16.9.5f
  111. Affected versionversion=16.9.6
  112. Affected versionversion=16.9.7
  113. Affected versionversion=16.9.8
  114. Affected versionversion=17.10.1
  115. Affected versionversion=17.10.1a
  116. Affected versionversion=17.10.1b
  117. Affected versionversion=17.1.1
  118. Affected versionversion=17.11.1
  119. Affected versionversion=17.11.1a
  120. Affected versionversion=17.1.1a
  121. Affected versionversion=17.1.1s
  122. Affected versionversion=17.1.1t
  123. Affected versionversion=17.12.1
  124. Affected versionversion=17.12.1w
  125. Affected versionversion=17.12.1x
  126. Affected versionversion=17.12.1y
  127. Affected versionversion=17.12.1z
  128. Affected versionversion=17.12.1z1
  129. Affected versionversion=17.12.2
  130. Affected versionversion=17.12.2a
  131. Affected versionversion=17.12.3
  132. Affected versionversion=17.12.3a
  133. Affected versionversion=17.12.4
  134. Affected versionversion=17.12.4a
  135. Affected versionversion=17.12.4b
  136. Affected versionversion=17.1.3
  137. Affected versionversion=17.13.1
  138. Affected versionversion=17.13.1a
  139. Affected versionversion=17.14.1
  140. Affected versionversion=17.14.1a
  141. Affected versionversion=17.2.1
  142. Affected versionversion=17.2.1a
  143. Affected versionversion=17.2.1r
  144. Affected versionversion=17.2.1v
  145. Affected versionversion=17.2.2
  146. Affected versionversion=17.2.3
  147. Affected versionversion=17.3.1
  148. Affected versionversion=17.3.1a
  149. Affected versionversion=17.3.1w
  150. Affected versionversion=17.3.1x
  151. Affected versionversion=17.3.1z
  152. Affected versionversion=17.3.2
  153. Affected versionversion=17.3.2a
  154. Affected versionversion=17.3.3
  155. Affected versionversion=17.3.4
  156. Affected versionversion=17.3.4a
  157. Affected versionversion=17.3.4b
  158. Affected versionversion=17.3.4c
  159. Affected versionversion=17.3.5
  160. Affected versionversion=17.3.5a
  161. Affected versionversion=17.3.5b
  162. Affected versionversion=17.3.6
  163. Affected versionversion=17.3.7
  164. Affected versionversion=17.3.8
  165. Affected versionversion=17.3.8a
  166. Affected versionversion=17.4.1
  167. Affected versionversion=17.4.1a
  168. Affected versionversion=17.4.1b
  169. Affected versionversion=17.4.2
  170. Affected versionversion=17.4.2a
  171. Affected versionversion=17.5.1
  172. Affected versionversion=17.5.1a
  173. Affected versionversion=17.6.1
  174. Affected versionversion=17.6.1a
  175. Affected versionversion=17.6.1w
  176. Affected versionversion=17.6.1x
  177. Affected versionversion=17.6.1y
  178. Affected versionversion=17.6.1z
  179. Affected versionversion=17.6.1z1
  180. Affected versionversion=17.6.2
  181. Affected versionversion=17.6.3
  182. Affected versionversion=17.6.3a
  183. Affected versionversion=17.6.4
  184. Affected versionversion=17.6.5
  185. Affected versionversion=17.6.5a
  186. Affected versionversion=17.6.6
  187. Affected versionversion=17.6.6a
  188. Affected versionversion=17.6.7
  189. Affected versionversion=17.6.8
  190. Affected versionversion=17.6.8a
  191. Affected versionversion=17.7.1
  192. Affected versionversion=17.7.1a
  193. Affected versionversion=17.7.1b
  194. Affected versionversion=17.7.2
  195. Affected versionversion=17.8.1
  196. Affected versionversion=17.8.1a
  197. Affected versionversion=17.9.1
  198. Affected versionversion=17.9.1a
  199. Affected versionversion=17.9.1w
  200. Affected versionversion=17.9.1x
  201. Affected versionversion=17.9.1x1
  202. Affected versionversion=17.9.1y
  203. Affected versionversion=17.9.1y1
  204. Affected versionversion=17.9.2
  205. Affected versionversion=17.9.2a
  206. Affected versionversion=17.9.3
  207. Affected versionversion=17.9.3a
  208. Affected versionversion=17.9.4
  209. Affected versionversion=17.9.4a
  210. Affected versionversion=17.9.5
  211. Affected versionversion=17.9.5a
  212. Affected versionversion=17.9.5b
  213. Affected versionversion=17.9.5e
  214. Affected versionversion=17.9.5f
  215. Affected versionversion=17.9.6
  216. Affected versionversion=17.9.6a
  217. Affected versionversion=3.16.0cS
  218. Affected versionversion=3.16.0S
  219. Affected versionversion=3.16.10S
  220. Affected versionversion=3.16.1aS
  221. Affected versionversion=3.16.1S
  222. Affected versionversion=3.16.2aS
  223. Affected versionversion=3.16.2bS
  224. Affected versionversion=3.16.2S
  225. Affected versionversion=3.16.3aS
  226. Affected versionversion=3.16.3S
  227. Affected versionversion=3.16.4aS
  228. Affected versionversion=3.16.4bS
  229. Affected versionversion=3.16.4dS
  230. Affected versionversion=3.16.4S
  231. Affected versionversion=3.16.5S
  232. Affected versionversion=3.16.6bS
  233. Affected versionversion=3.16.6S
  234. Affected versionversion=3.16.7aS
  235. Affected versionversion=3.16.7bS
  236. Affected versionversion=3.16.7S
  237. Affected versionversion=3.16.8S
  238. Affected versionversion=3.16.9S
  239. Affected versionversion=3.17.0S
  240. Affected versionversion=3.17.1aS
  241. Affected versionversion=3.17.1S
  242. Affected versionversion=3.17.2S
  243. Affected versionversion=3.17.3S
  244. Affected versionversion=3.17.4S
  245. Affected versionversion=3.18.0aS
  246. Affected versionversion=3.18.0S
  247. Affected versionversion=3.18.0SP
  248. Affected versionversion=3.18.1aSP
  249. Affected versionversion=3.18.1bSP
  250. Affected versionversion=3.18.1cSP
  251. Affected versionversion=3.18.1S
  252. Affected versionversion=3.18.1SP
  253. Affected versionversion=3.18.2aSP
  254. Affected versionversion=3.18.2S
  255. Affected versionversion=3.18.2SP
  256. Affected versionversion=3.18.3aSP
  257. Affected versionversion=3.18.3bSP
  258. Affected versionversion=3.18.3S
  259. Affected versionversion=3.18.3SP
  260. Affected versionversion=3.18.4S
  261. Affected versionversion=3.18.4SP
  262. Affected versionversion=3.18.5SP
  263. Affected versionversion=3.18.6SP
  264. Affected versionversion=3.18.7SP
  265. Affected versionversion=3.18.8aSP
  266. Affected versionversion=3.18.9SP

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

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=16.12.11; version=16.12.12; version=16.12.13; 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=17.1.1a; version=17.1.1s; version=17.1.1t; version=17.12.1; version=17.12.1w; version=17.12.1x; version=17.12.1y; version=17.12.1z; version=17.12.1z1; 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=17.1.3; version=17.13.1; version=17.13.1a; version=17.14.1; version=17.14.1a; 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=3.16.0cS; version=3.16.0S; version=3.16.10S; 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=3.16.6bS; version=3.16.6S; version=3.16.7aS; version=3.16.7bS; version=3.16.7S; version=3.16.8S; version=3.16.9S; version=3.17.0S; version=3.17.1aS; version=3.17.1S; version=3.17.2S; version=3.17.3S; version=3.17.4S; 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=3.18.2aSP; version=3.18.2S; version=3.18.2SP; version=3.18.3aSP; version=3.18.3bSP; version=3.18.3S; version=3.18.3SP; version=3.18.4S; version=3.18.4SP; version=3.18.5SP; version=3.18.6SP; version=3.18.7SP; version=3.18.8aSP; version=3.18.9SP

Published CVSS scores

7.4CiscoCVSS:3.1/AV:A/AC:L/PR:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-762Mismatched Memory Management Routines
T1498.001Direct Network Flood

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

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo