CVE-2024-20402Network attack vector

Device reload via SSL VPN memory-management error

Published Oct 23, 2024 · Updated Oct 24, 2024

Memory-management error in the SSL VPN feature of Cisco ASA and FTD Software allows remote attackers to force a device reload. The SSL VPN connection handler applies incorrect memory-management logic to crafted SSL/TLS packets, causing an unexpected reload. The feature must be enabled and network-reachable; successful exploitation interrupts firewall and VPN availability without reported data disclosure or modification.

CVSS severity8.6
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory-management error in the SSL VPN feature of Cisco ASA and FTD Software allows remote attackers to force a device reload. The SSL VPN connection handler applies incorrect memory-management logic to crafted SSL/TLS packets, causing an unexpected reload. The feature must be enabled and network-reachable; successful exploitation interrupts firewall and VPN availability without reported data disclosure or modification.

The record

CVE
CVE-2024-20402
Published
Oct 23, 2024
Updated
Oct 24, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-788, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 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=9.12.1
  2. Affected versionversion=9.12.1.2
  3. Affected versionversion=9.12.1.3
  4. Affected versionversion=9.12.1 <=9.12.4.67
  5. Affected versionversion=9.12.2
  6. Affected versionversion=9.12.2.1
  7. Affected versionversion=9.12.2.4
  8. Affected versionversion=9.12.2.5
  9. Affected versionversion=9.12.2.9
  10. Affected versionversion=9.12.3
  11. Affected versionversion=9.12.3.12
  12. Affected versionversion=9.12.3.2
  13. Affected versionversion=9.12.3.7
  14. Affected versionversion=9.12.3.9
  15. Affected versionversion=9.12.4
  16. Affected versionversion=9.12.4.10
  17. Affected versionversion=9.12.4.13
  18. Affected versionversion=9.12.4.18
  19. Affected versionversion=9.12.4.2
  20. Affected versionversion=9.12.4.24
  21. Affected versionversion=9.12.4.26
  22. Affected versionversion=9.12.4.29
  23. Affected versionversion=9.12.4.30
  24. Affected versionversion=9.12.4.35
  25. Affected versionversion=9.12.4.37
  26. Affected versionversion=9.12.4.38
  27. Affected versionversion=9.12.4.39
  28. Affected versionversion=9.12.4.4
  29. Affected versionversion=9.12.4.40
  30. Affected versionversion=9.12.4.41
  31. Affected versionversion=9.12.4.47
  32. Affected versionversion=9.12.4.48
  33. Affected versionversion=9.12.4.50
  34. Affected versionversion=9.12.4.52
  35. Affected versionversion=9.12.4.54
  36. Affected versionversion=9.12.4.55
  37. Affected versionversion=9.12.4.56
  38. Affected versionversion=9.12.4.58
  39. Affected versionversion=9.12.4.62
  40. Affected versionversion=9.12.4.65
  41. Affected versionversion=9.12.4.67
  42. Affected versionversion=9.12.4.7
  43. Affected versionversion=9.12.4.8
  44. Affected versionversion=9.14.1
  45. Affected versionversion=9.14.1.10
  46. Affected versionversion=9.14.1.15
  47. Affected versionversion=9.14.1.19
  48. Affected versionversion=9.14.1.30
  49. Affected versionversion=9.14.1.6
  50. Affected versionversion=9.14.1 <=9.14.4.24
  51. Affected versionversion=9.14.2
  52. Affected versionversion=9.14.2.13
  53. Affected versionversion=9.14.2.15
  54. Affected versionversion=9.14.2.4
  55. Affected versionversion=9.14.2.8
  56. Affected versionversion=9.14.3
  57. Affected versionversion=9.14.3.1
  58. Affected versionversion=9.14.3.11
  59. Affected versionversion=9.14.3.13
  60. Affected versionversion=9.14.3.15
  61. Affected versionversion=9.14.3.18
  62. Affected versionversion=9.14.3.9
  63. Affected versionversion=9.14.4
  64. Affected versionversion=9.14.4.12
  65. Affected versionversion=9.14.4.13
  66. Affected versionversion=9.14.4.14
  67. Affected versionversion=9.14.4.15
  68. Affected versionversion=9.14.4.17
  69. Affected versionversion=9.14.4.22
  70. Affected versionversion=9.14.4.23
  71. Affected versionversion=9.14.4.24
  72. Affected versionversion=9.14.4.6
  73. Affected versionversion=9.14.4.7
  74. Affected versionversion=9.15.1
  75. Affected versionversion=9.15.1.1
  76. Affected versionversion=9.15.1.10
  77. Affected versionversion=9.15.1.15
  78. Affected versionversion=9.15.1.16
  79. Affected versionversion=9.15.1.17
  80. Affected versionversion=9.15.1.21
  81. Affected versionversion=9.15.1.7
  82. Affected versionversion=9.15.1 <=9.15.1.21
  83. Affected versionversion=9.16.1
  84. Affected versionversion=9.16.1.28
  85. Affected versionversion=9.16.1 <=9.16.4.61
  86. Affected versionversion=9.16.2
  87. Affected versionversion=9.16.2.11
  88. Affected versionversion=9.16.2.13
  89. Affected versionversion=9.16.2.14
  90. Affected versionversion=9.16.2.3
  91. Affected versionversion=9.16.2.7
  92. Affected versionversion=9.16.3
  93. Affected versionversion=9.16.3.14
  94. Affected versionversion=9.16.3.15
  95. Affected versionversion=9.16.3.19
  96. Affected versionversion=9.16.3.23
  97. Affected versionversion=9.16.3.3
  98. Affected versionversion=9.16.4
  99. Affected versionversion=9.16.4.14
  100. Affected versionversion=9.16.4.18
  101. Affected versionversion=9.16.4.19
  102. Affected versionversion=9.16.4.27
  103. Affected versionversion=9.16.4.38
  104. Affected versionversion=9.16.4.39
  105. Affected versionversion=9.16.4.42
  106. Affected versionversion=9.16.4.48
  107. Affected versionversion=9.16.4.55
  108. Affected versionversion=9.16.4.57
  109. Affected versionversion=9.16.4.61
  110. Affected versionversion=9.16.4.9
  111. Affected versionversion=9.17.1
  112. Affected versionversion=9.17.1.10
  113. Affected versionversion=9.17.1.11
  114. Affected versionversion=9.17.1.13
  115. Affected versionversion=9.17.1.15
  116. Affected versionversion=9.17.1.20
  117. Affected versionversion=9.17.1.30
  118. Affected versionversion=9.17.1.33
  119. Affected versionversion=9.17.1.39
  120. Affected versionversion=9.17.1.7
  121. Affected versionversion=9.17.1.9
  122. Affected versionversion=9.17.1 <=9.17.1.39
  123. Affected versionversion=9.18.1
  124. Affected versionversion=9.18.1.3
  125. Affected versionversion=9.18.1 <=9.18.4.29
  126. Affected versionversion=9.18.2
  127. Affected versionversion=9.18.2.5
  128. Affected versionversion=9.18.2.7
  129. Affected versionversion=9.18.2.8
  130. Affected versionversion=9.18.3
  131. Affected versionversion=9.18.3.39
  132. Affected versionversion=9.18.3.46
  133. Affected versionversion=9.18.3.53
  134. Affected versionversion=9.18.3.55
  135. Affected versionversion=9.18.3.56
  136. Affected versionversion=9.18.4
  137. Affected versionversion=9.18.4.22
  138. Affected versionversion=9.18.4.24
  139. Affected versionversion=9.18.4.29
  140. Affected versionversion=9.18.4.5
  141. Affected versionversion=9.18.4.8
  142. Affected versionversion=9.19.1
  143. Affected versionversion=9.19.1.12
  144. Affected versionversion=9.19.1.18
  145. Affected versionversion=9.19.1.22
  146. Affected versionversion=9.19.1.24
  147. Affected versionversion=9.19.1.27
  148. Affected versionversion=9.19.1.28
  149. Affected versionversion=9.19.1.31
  150. Affected versionversion=9.19.1.5
  151. Affected versionversion=9.19.1.9
  152. Affected versionversion=9.19.1 <=9.19.1.31
  153. Affected versionversion=9.8.1
  154. Affected versionversion=9.8.1.5
  155. Affected versionversion=9.8.1.7
  156. Affected versionversion=9.8.1 <=9.8.4.48
  157. Affected versionversion=9.8.2
  158. Affected versionversion=9.8.2.14
  159. Affected versionversion=9.8.2.15
  160. Affected versionversion=9.8.2.17
  161. Affected versionversion=9.8.2.20
  162. Affected versionversion=9.8.2.24
  163. Affected versionversion=9.8.2.26
  164. Affected versionversion=9.8.2.28
  165. Affected versionversion=9.8.2.33
  166. Affected versionversion=9.8.2.35
  167. Affected versionversion=9.8.2.38
  168. Affected versionversion=9.8.2.45
  169. Affected versionversion=9.8.2.8
  170. Affected versionversion=9.8.3
  171. Affected versionversion=9.8.3.11
  172. Affected versionversion=9.8.3.14
  173. Affected versionversion=9.8.3.16
  174. Affected versionversion=9.8.3.18
  175. Affected versionversion=9.8.3.21
  176. Affected versionversion=9.8.3.26
  177. Affected versionversion=9.8.3.29
  178. Affected versionversion=9.8.3.8
  179. Affected versionversion=9.8.4
  180. Affected versionversion=9.8.4.10
  181. Affected versionversion=9.8.4.12
  182. Affected versionversion=9.8.4.15
  183. Affected versionversion=9.8.4.17
  184. Affected versionversion=9.8.4.20
  185. Affected versionversion=9.8.4.22
  186. Affected versionversion=9.8.4.25
  187. Affected versionversion=9.8.4.26
  188. Affected versionversion=9.8.4.29
  189. Affected versionversion=9.8.4.3
  190. Affected versionversion=9.8.4.32
  191. Affected versionversion=9.8.4.33
  192. Affected versionversion=9.8.4.34
  193. Affected versionversion=9.8.4.35
  194. Affected versionversion=9.8.4.39
  195. Affected versionversion=9.8.4.40
  196. Affected versionversion=9.8.4.41
  197. Affected versionversion=9.8.4.43
  198. Affected versionversion=9.8.4.44
  199. Affected versionversion=9.8.4.45
  200. Affected versionversion=9.8.4.46
  201. Affected versionversion=9.8.4.48
  202. Affected versionversion=9.8.4.7
  203. Affected versionversion=9.8.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=9.12.1; version=9.12.1.2; version=9.12.1.3; version=9.12.1 <=9.12.4.67; version=9.12.2; version=9.12.2.1; version=9.12.2.4; version=9.12.2.5; version=9.12.2.9; version=9.12.3; version=9.12.3.12; version=9.12.3.2; version=9.12.3.7; version=9.12.3.9; version=9.12.4; version=9.12.4.10; version=9.12.4.13; version=9.12.4.18; version=9.12.4.2; version=9.12.4.24; version=9.12.4.26; version=9.12.4.29; version=9.12.4.30; version=9.12.4.35; version=9.12.4.37; version=9.12.4.38; version=9.12.4.39; version=9.12.4.4; version=9.12.4.40; version=9.12.4.41; version=9.12.4.47; version=9.12.4.48; version=9.12.4.50; version=9.12.4.52; version=9.12.4.54; version=9.12.4.55; version=9.12.4.56; version=9.12.4.58; version=9.12.4.62; version=9.12.4.65; version=9.12.4.67; version=9.12.4.7; version=9.12.4.8; version=9.14.1; version=9.14.1.10; version=9.14.1.15; version=9.14.1.19; version=9.14.1.30; version=9.14.1.6; version=9.14.1 <=9.14.4.24; version=9.14.2; version=9.14.2.13; version=9.14.2.15; version=9.14.2.4; version=9.14.2.8; version=9.14.3; version=9.14.3.1; version=9.14.3.11; version=9.14.3.13; version=9.14.3.15; version=9.14.3.18; version=9.14.3.9; version=9.14.4; version=9.14.4.12; version=9.14.4.13; version=9.14.4.14; version=9.14.4.15; version=9.14.4.17; version=9.14.4.22; version=9.14.4.23; version=9.14.4.24; version=9.14.4.6; version=9.14.4.7; version=9.15.1; version=9.15.1.1; version=9.15.1.10; version=9.15.1.15; version=9.15.1.16; version=9.15.1.17; version=9.15.1.21; version=9.15.1.7; version=9.15.1 <=9.15.1.21; version=9.16.1; version=9.16.1.28; version=9.16.1 <=9.16.4.61; version=9.16.2; version=9.16.2.11; version=9.16.2.13; version=9.16.2.14; version=9.16.2.3; version=9.16.2.7; version=9.16.3; version=9.16.3.14; version=9.16.3.15; version=9.16.3.19; version=9.16.3.23; version=9.16.3.3; version=9.16.4; version=9.16.4.14; version=9.16.4.18; version=9.16.4.19; version=9.16.4.27; version=9.16.4.38; version=9.16.4.39; version=9.16.4.42; version=9.16.4.48; version=9.16.4.55; version=9.16.4.57; version=9.16.4.61; version=9.16.4.9; version=9.17.1; version=9.17.1.10; version=9.17.1.11; version=9.17.1.13; version=9.17.1.15; version=9.17.1.20; version=9.17.1.30; version=9.17.1.33; version=9.17.1.39; version=9.17.1.7; version=9.17.1.9; version=9.17.1 <=9.17.1.39; version=9.18.1; version=9.18.1.3; version=9.18.1 <=9.18.4.29; version=9.18.2; version=9.18.2.5; version=9.18.2.7; version=9.18.2.8; version=9.18.3; version=9.18.3.39; version=9.18.3.46; version=9.18.3.53; version=9.18.3.55; version=9.18.3.56; version=9.18.4; version=9.18.4.22; version=9.18.4.24; version=9.18.4.29; version=9.18.4.5; version=9.18.4.8; version=9.19.1; version=9.19.1.12; version=9.19.1.18; version=9.19.1.22; version=9.19.1.24; version=9.19.1.27; version=9.19.1.28; version=9.19.1.31; version=9.19.1.5; version=9.19.1.9; version=9.19.1 <=9.19.1.31; version=9.8.1; version=9.8.1.5; version=9.8.1.7; version=9.8.1 <=9.8.4.48; version=9.8.2; version=9.8.2.14; version=9.8.2.15; version=9.8.2.17; version=9.8.2.20; version=9.8.2.24; version=9.8.2.26; version=9.8.2.28; version=9.8.2.33; version=9.8.2.35; version=9.8.2.38; version=9.8.2.45; version=9.8.2.8; version=9.8.3; version=9.8.3.11; version=9.8.3.14; version=9.8.3.16; version=9.8.3.18; version=9.8.3.21; version=9.8.3.26; version=9.8.3.29; version=9.8.3.8; version=9.8.4; version=9.8.4.10; version=9.8.4.12; version=9.8.4.15; version=9.8.4.17; version=9.8.4.20; version=9.8.4.22; version=9.8.4.25; version=9.8.4.26; version=9.8.4.29; version=9.8.4.3; version=9.8.4.32; version=9.8.4.33; version=9.8.4.34; version=9.8.4.35; version=9.8.4.39; version=9.8.4.40; version=9.8.4.41; version=9.8.4.43; version=9.8.4.44; version=9.8.4.45; version=9.8.4.46; version=9.8.4.48; version=9.8.4.7; version=9.8.4.8
ClamAV · Cisco Firepower Threat Defenseversion=6.2.3; version=6.2.3.1; version=6.2.3.10; version=6.2.3.11; version=6.2.3.12; version=6.2.3.13; version=6.2.3.14; version=6.2.3.15; version=6.2.3.16; version=6.2.3.17; version=6.2.3.18; version=6.2.3.2; version=6.2.3.3; version=6.2.3.4; version=6.2.3.5; version=6.2.3.6; version=6.2.3 <=6.2.3.18; version=6.2.3.7; version=6.2.3.8; version=6.2.3.9; version=6.4.0; version=6.4.0.1; version=6.4.0.10; version=6.4.0.11; version=6.4.0.12; version=6.4.0.13; version=6.4.0.14; version=6.4.0.15; version=6.4.0.16; version=6.4.0.17; version=6.4.0.18; version=6.4.0.2; version=6.4.0.3; version=6.4.0.4; version=6.4.0.5; version=6.4.0.6; version=6.4.0 <=6.4.0.18; version=6.4.0.7; version=6.4.0.8; version=6.4.0.9; version=6.6.0; version=6.6.0.1; version=6.6.0 <=6.6.7.2; version=6.6.1; version=6.6.3; version=6.6.4; version=6.6.5; version=6.6.5.1; version=6.6.5.2; version=6.6.7; version=6.6.7.1; version=6.6.7.2; version=6.7.0; version=6.7.0.1; version=6.7.0.2; version=6.7.0.3; version=6.7.0 <=6.7.0.3; version=7.0.0; version=7.0.0.1; version=7.0.0 <=7.0.6.2; version=7.0.1; version=7.0.1.1; version=7.0.2; version=7.0.2.1; version=7.0.3; version=7.0.4; version=7.0.5; version=7.0.6; version=7.0.6.1; version=7.0.6.2; version=7.1.0; version=7.1.0.1; version=7.1.0.2; version=7.1.0.3; version=7.1.0 <=7.1.0.3; version=7.2.0; version=7.2.0.1; version=7.2.0 <=7.2.8.1; version=7.2.1; version=7.2.2; version=7.2.3; version=7.2.4; version=7.2.4.1; version=7.2.5; version=7.2.5.1; version=7.2.5.2; version=7.2.6; version=7.2.7; version=7.2.8; version=7.2.8.1; version=7.3.0; version=7.3.0 <=7.3.1.2; version=7.3.1; version=7.3.1.1; version=7.3.1.2

Published CVSS scores

8.6Cisco Systems, Inc.CVSS:3.1/AV:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-788Access of Memory Location After End of Buffer
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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