CVE-2021-1424Network attack vector

Unauthenticated service interruption via malformed IKEv2 packets

Published Nov 18, 2024 · Updated Nov 18, 2024

Denial of service in Cisco ASR 5000 Series Software before 21.22 allows remote attackers to restart ipsecmgr with malformed IKEv2 packets. The ipsecmgr process insufficiently validates incoming IKEv2 packets and restarts when it parses a specifically malformed packet. Exposure requires an affected device configured to negotiate IPsec connections over IKEv2; exploitation interrupts ongoing negotiations temporarily.

CVSS severity5.3
Medium
EPSS probability0.81%
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 ASR 5000 Series Software before 21.22 allows remote attackers to restart ipsecmgr with malformed IKEv2 packets. The ipsecmgr process insufficiently validates incoming IKEv2 packets and restarts when it parses a specifically malformed packet. Exposure requires an affected device configured to negotiate IPsec connections over IKEv2; exploitation interrupts ongoing negotiations temporarily.

The record

CVE
CVE-2021-1424
Published
Nov 18, 2024
Updated
Nov 18, 2024
Vendor
ClamAV
Product
Cisco ASR 5000 Series Software
Classifications
CWE-119, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 18, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 18, 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=21.11.0
  2. Affected versionversion=21.11.1
  3. Affected versionversion=21.11.10
  4. Affected versionversion=21.11.11
  5. Affected versionversion=21.11.12
  6. Affected versionversion=21.11.13
  7. Affected versionversion=21.11.14
  8. Affected versionversion=21.11.15
  9. Affected versionversion=21.11.16
  10. Affected versionversion=21.11.17
  11. Affected versionversion=21.11.18
  12. Affected versionversion=21.11.19
  13. Affected versionversion=21.11.2
  14. Affected versionversion=21.11.3
  15. Affected versionversion=21.11.4
  16. Affected versionversion=21.11.5
  17. Affected versionversion=21.11.6
  18. Affected versionversion=21.11.7
  19. Affected versionversion=21.11.8
  20. Affected versionversion=21.11.9
  21. Affected versionversion=21.12.0
  22. Affected versionversion=21.12.1
  23. Affected versionversion=21.12.10
  24. Affected versionversion=21.12.11
  25. Affected versionversion=21.12.12
  26. Affected versionversion=21.12.13
  27. Affected versionversion=21.12.14
  28. Affected versionversion=21.12.16
  29. Affected versionversion=21.12.17
  30. Affected versionversion=21.12.18
  31. Affected versionversion=21.12.19
  32. Affected versionversion=21.12.2
  33. Affected versionversion=21.12.20
  34. Affected versionversion=21.12.21
  35. Affected versionversion=21.12.3
  36. Affected versionversion=21.12.4
  37. Affected versionversion=21.12.5
  38. Affected versionversion=21.12.6
  39. Affected versionversion=21.12.7
  40. Affected versionversion=21.12.8
  41. Affected versionversion=21.12.9
  42. Affected versionversion=21.13.0
  43. Affected versionversion=21.13.1
  44. Affected versionversion=21.13.10
  45. Affected versionversion=21.13.11
  46. Affected versionversion=21.13.12
  47. Affected versionversion=21.13.13
  48. Affected versionversion=21.13.14
  49. Affected versionversion=21.13.15
  50. Affected versionversion=21.13.16
  51. Affected versionversion=21.13.17
  52. Affected versionversion=21.13.18
  53. Affected versionversion=21.13.19
  54. Affected versionversion=21.13.2
  55. Affected versionversion=21.13.20
  56. Affected versionversion=21.13.21
  57. Affected versionversion=21.13.3
  58. Affected versionversion=21.13.4
  59. Affected versionversion=21.13.5
  60. Affected versionversion=21.13.6
  61. Affected versionversion=21.13.7
  62. Affected versionversion=21.13.8
  63. Affected versionversion=21.13.9
  64. Affected versionversion=21.14.0
  65. Affected versionversion=21.14.1
  66. Affected versionversion=21.14.10
  67. Affected versionversion=21.14.11
  68. Affected versionversion=21.14.12
  69. Affected versionversion=21.14.16
  70. Affected versionversion=21.14.17
  71. Affected versionversion=21.14.19
  72. Affected versionversion=21.14.2
  73. Affected versionversion=21.14.20
  74. Affected versionversion=21.14.22
  75. Affected versionversion=21.14.23
  76. Affected versionversion=21.14.3
  77. Affected versionversion=21.14.4
  78. Affected versionversion=21.14.5
  79. Affected versionversion=21.14.6
  80. Affected versionversion=21.14.7
  81. Affected versionversion=21.14.8
  82. Affected versionversion=21.14.9
  83. Affected versionversion=21.14.a0
  84. Affected versionversion=21.14.b12
  85. Affected versionversion=21.14.b13
  86. Affected versionversion=21.14.b14
  87. Affected versionversion=21.14.b15
  88. Affected versionversion=21.14.b17
  89. Affected versionversion=21.14.b18
  90. Affected versionversion=21.14.b19
  91. Affected versionversion=21.14.b20
  92. Affected versionversion=21.14.b21
  93. Affected versionversion=21.14.b22
  94. Affected versionversion=21.15.0
  95. Affected versionversion=21.15.1
  96. Affected versionversion=21.15.10
  97. Affected versionversion=21.15.11
  98. Affected versionversion=21.15.12
  99. Affected versionversion=21.15.13
  100. Affected versionversion=21.15.14
  101. Affected versionversion=21.15.15
  102. Affected versionversion=21.15.16
  103. Affected versionversion=21.15.17
  104. Affected versionversion=21.15.18
  105. Affected versionversion=21.15.19
  106. Affected versionversion=21.15.2
  107. Affected versionversion=21.15.20
  108. Affected versionversion=21.15.21
  109. Affected versionversion=21.15.22
  110. Affected versionversion=21.15.24
  111. Affected versionversion=21.15.25
  112. Affected versionversion=21.15.26
  113. Affected versionversion=21.15.27
  114. Affected versionversion=21.15.28
  115. Affected versionversion=21.15.29
  116. Affected versionversion=21.15.3
  117. Affected versionversion=21.15.30
  118. Affected versionversion=21.15.32
  119. Affected versionversion=21.15.33
  120. Affected versionversion=21.15.36
  121. Affected versionversion=21.15.37
  122. Affected versionversion=21.15.4
  123. Affected versionversion=21.15.40
  124. Affected versionversion=21.15.41
  125. Affected versionversion=21.15.43
  126. Affected versionversion=21.15.45
  127. Affected versionversion=21.15.46
  128. Affected versionversion=21.15.47
  129. Affected versionversion=21.15.48
  130. Affected versionversion=21.15.5
  131. Affected versionversion=21.15.51
  132. Affected versionversion=21.15.52
  133. Affected versionversion=21.15.53
  134. Affected versionversion=21.15.54
  135. Affected versionversion=21.15.55
  136. Affected versionversion=21.15.6
  137. Affected versionversion=21.15.7
  138. Affected versionversion=21.15.8
  139. Affected versionversion=21.16.2
  140. Affected versionversion=21.16.3
  141. Affected versionversion=21.16.4
  142. Affected versionversion=21.16.5
  143. Affected versionversion=21.16.6
  144. Affected versionversion=21.16.7
  145. Affected versionversion=21.16.8
  146. Affected versionversion=21.16.c10
  147. Affected versionversion=21.16.c11
  148. Affected versionversion=21.16.c12
  149. Affected versionversion=21.16.c13
  150. Affected versionversion=21.16.c14
  151. Affected versionversion=21.16.c15
  152. Affected versionversion=21.16.c9
  153. Affected versionversion=21.16.d0
  154. Affected versionversion=21.16.d1
  155. Affected versionversion=21.17.0
  156. Affected versionversion=21.17.1
  157. Affected versionversion=21.17.10
  158. Affected versionversion=21.17.11
  159. Affected versionversion=21.17.12
  160. Affected versionversion=21.17.13
  161. Affected versionversion=21.17.14
  162. Affected versionversion=21.17.15
  163. Affected versionversion=21.17.16
  164. Affected versionversion=21.17.17
  165. Affected versionversion=21.17.2
  166. Affected versionversion=21.17.3
  167. Affected versionversion=21.17.4
  168. Affected versionversion=21.17.5
  169. Affected versionversion=21.17.6
  170. Affected versionversion=21.17.7
  171. Affected versionversion=21.17.8
  172. Affected versionversion=21.17.9
  173. Affected versionversion=21.18.0
  174. Affected versionversion=21.18.1
  175. Affected versionversion=21.18.11
  176. Affected versionversion=21.18.12
  177. Affected versionversion=21.18.13
  178. Affected versionversion=21.18.14
  179. Affected versionversion=21.18.15
  180. Affected versionversion=21.18.2
  181. Affected versionversion=21.18.3
  182. Affected versionversion=21.18.4
  183. Affected versionversion=21.18.5
  184. Affected versionversion=21.18.6
  185. Affected versionversion=21.18.7
  186. Affected versionversion=21.18.8
  187. Affected versionversion=21.18.9
  188. Affected versionversion=21.19.0
  189. Affected versionversion=21.19.1
  190. Affected versionversion=21.19.10
  191. Affected versionversion=21.19.2
  192. Affected versionversion=21.19.3
  193. Affected versionversion=21.19.4
  194. Affected versionversion=21.19.5
  195. Affected versionversion=21.19.6
  196. Affected versionversion=21.19.7
  197. Affected versionversion=21.19.8
  198. Affected versionversion=21.19.9
  199. Affected versionversion=21.19.n3
  200. Affected versionversion=21.19.n4
  201. Affected versionversion=21.19.n5
  202. Affected versionversion=21.19.n6
  203. Affected versionversion=21.20.0
  204. Affected versionversion=21.20.1
  205. Affected versionversion=21.20.10
  206. Affected versionversion=21.20.11
  207. Affected versionversion=21.20.2
  208. Affected versionversion=21.20.3
  209. Affected versionversion=21.20.4
  210. Affected versionversion=21.20.6
  211. Affected versionversion=21.20.7
  212. Affected versionversion=21.20.8
  213. Affected versionversion=21.20.9
  214. Affected versionversion=21.20.k6
  215. Affected versionversion=21.20.k7
  216. Affected versionversion=21.20.sv1
  217. Affected versionversion=21.20.SV1
  218. Affected versionversion=21.20.sv2
  219. Affected versionversion=21.20.SV2
  220. Affected versionversion=21.20.sv3
  221. Affected versionversion=21.20.SV3
  222. Affected versionversion=21.20.sv5
  223. Affected versionversion=21.20.SV5
  224. Affected versionversion=21.20.u8
  225. Affected versionversion=21.21.0
  226. Affected versionversion=21.21.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco ASR 5000 Series Softwareversion=21.11.0; version=21.11.1; version=21.11.10; version=21.11.11; version=21.11.12; version=21.11.13; version=21.11.14; version=21.11.15; version=21.11.16; version=21.11.17; version=21.11.18; version=21.11.19; version=21.11.2; version=21.11.3; version=21.11.4; version=21.11.5; version=21.11.6; version=21.11.7; version=21.11.8; version=21.11.9; version=21.12.0; version=21.12.1; version=21.12.10; version=21.12.11; version=21.12.12; version=21.12.13; version=21.12.14; version=21.12.16; version=21.12.17; version=21.12.18; version=21.12.19; version=21.12.2; version=21.12.20; version=21.12.21; version=21.12.3; version=21.12.4; version=21.12.5; version=21.12.6; version=21.12.7; version=21.12.8; version=21.12.9; version=21.13.0; version=21.13.1; version=21.13.10; version=21.13.11; version=21.13.12; version=21.13.13; version=21.13.14; version=21.13.15; version=21.13.16; version=21.13.17; version=21.13.18; version=21.13.19; version=21.13.2; version=21.13.20; version=21.13.21; version=21.13.3; version=21.13.4; version=21.13.5; version=21.13.6; version=21.13.7; version=21.13.8; version=21.13.9; version=21.14.0; version=21.14.1; version=21.14.10; version=21.14.11; version=21.14.12; version=21.14.16; version=21.14.17; version=21.14.19; version=21.14.2; version=21.14.20; version=21.14.22; version=21.14.23; version=21.14.3; version=21.14.4; version=21.14.5; version=21.14.6; version=21.14.7; version=21.14.8; version=21.14.9; version=21.14.a0; version=21.14.b12; version=21.14.b13; version=21.14.b14; version=21.14.b15; version=21.14.b17; version=21.14.b18; version=21.14.b19; version=21.14.b20; version=21.14.b21; version=21.14.b22; version=21.15.0; version=21.15.1; version=21.15.10; version=21.15.11; version=21.15.12; version=21.15.13; version=21.15.14; version=21.15.15; version=21.15.16; version=21.15.17; version=21.15.18; version=21.15.19; version=21.15.2; version=21.15.20; version=21.15.21; version=21.15.22; version=21.15.24; version=21.15.25; version=21.15.26; version=21.15.27; version=21.15.28; version=21.15.29; version=21.15.3; version=21.15.30; version=21.15.32; version=21.15.33; version=21.15.36; version=21.15.37; version=21.15.4; version=21.15.40; version=21.15.41; version=21.15.43; version=21.15.45; version=21.15.46; version=21.15.47; version=21.15.48; version=21.15.5; version=21.15.51; version=21.15.52; version=21.15.53; version=21.15.54; version=21.15.55; version=21.15.6; version=21.15.7; version=21.15.8; version=21.16.2; version=21.16.3; version=21.16.4; version=21.16.5; version=21.16.6; version=21.16.7; version=21.16.8; version=21.16.c10; version=21.16.c11; version=21.16.c12; version=21.16.c13; version=21.16.c14; version=21.16.c15; version=21.16.c9; version=21.16.d0; version=21.16.d1; version=21.17.0; version=21.17.1; version=21.17.10; version=21.17.11; version=21.17.12; version=21.17.13; version=21.17.14; version=21.17.15; version=21.17.16; version=21.17.17; version=21.17.2; version=21.17.3; version=21.17.4; version=21.17.5; version=21.17.6; version=21.17.7; version=21.17.8; version=21.17.9; version=21.18.0; version=21.18.1; version=21.18.11; version=21.18.12; version=21.18.13; version=21.18.14; version=21.18.15; version=21.18.2; version=21.18.3; version=21.18.4; version=21.18.5; version=21.18.6; version=21.18.7; version=21.18.8; version=21.18.9; version=21.19.0; version=21.19.1; version=21.19.10; version=21.19.2; version=21.19.3; version=21.19.4; version=21.19.5; version=21.19.6; version=21.19.7; version=21.19.8; version=21.19.9; version=21.19.n3; version=21.19.n4; version=21.19.n5; version=21.19.n6; version=21.20.0; version=21.20.1; version=21.20.10; version=21.20.11; version=21.20.2; version=21.20.3; version=21.20.4; version=21.20.6; version=21.20.7; version=21.20.8; version=21.20.9; version=21.20.k6; version=21.20.k7; version=21.20.sv1; version=21.20.SV1; version=21.20.sv2; version=21.20.SV2; version=21.20.sv3; version=21.20.SV3; version=21.20.sv5; version=21.20.SV5; version=21.20.u8; version=21.21.0; version=21.21.1

Published CVSS scores

5.3CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
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

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Your stack

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