CVE-2024-20331Network attack vector

VPN login interruption via guessable session handles

Published Oct 23, 2024 · Updated Oct 24, 2024

Insufficient entropy in Cisco ASA and FTD Remote Access SSL VPN authentication allows remote attackers to prevent user logins. The authentication process produces guessable handles, enabling an attacker to identify an authenticating user's handle and submit it to terminate that session. Remote Access SSL VPN must be enabled, and the attacker must target a user during authentication; successful exploitation forces that user to restart and can repeatedly prevent a VPN session.

CVSS severity6.8
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient entropy in Cisco ASA and FTD Remote Access SSL VPN authentication allows remote attackers to prevent user logins. The authentication process produces guessable handles, enabling an attacker to identify an authenticating user's handle and submit it to terminate that session. Remote Access SSL VPN must be enabled, and the attacker must target a user during authentication; successful exploitation forces that user to restart and can repeatedly prevent a VPN session.

The record

CVE
CVE-2024-20331
Published
Oct 23, 2024
Updated
Oct 24, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-330, CAPEC-112, CAPEC-59, CAPEC-485, 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=9.12.2
  5. Affected versionversion=9.12.2.1
  6. Affected versionversion=9.12.2.4
  7. Affected versionversion=9.12.2.5
  8. Affected versionversion=9.12.2.9
  9. Affected versionversion=9.12.3
  10. Affected versionversion=9.12.3.12
  11. Affected versionversion=9.12.3.2
  12. Affected versionversion=9.12.3.7
  13. Affected versionversion=9.12.3.9
  14. Affected versionversion=9.12.4
  15. Affected versionversion=9.12.4.10
  16. Affected versionversion=9.12.4.13
  17. Affected versionversion=9.12.4.18
  18. Affected versionversion=9.12.4.2
  19. Affected versionversion=9.12.4.24
  20. Affected versionversion=9.12.4.26
  21. Affected versionversion=9.12.4.29
  22. Affected versionversion=9.12.4.30
  23. Affected versionversion=9.12.4.35
  24. Affected versionversion=9.12.4.37
  25. Affected versionversion=9.12.4.38
  26. Affected versionversion=9.12.4.39
  27. Affected versionversion=9.12.4.4
  28. Affected versionversion=9.12.4.40
  29. Affected versionversion=9.12.4.41
  30. Affected versionversion=9.12.4.47
  31. Affected versionversion=9.12.4.48
  32. Affected versionversion=9.12.4.50
  33. Affected versionversion=9.12.4.52
  34. Affected versionversion=9.12.4.54
  35. Affected versionversion=9.12.4.55
  36. Affected versionversion=9.12.4.56
  37. Affected versionversion=9.12.4.58
  38. Affected versionversion=9.12.4.62
  39. Affected versionversion=9.12.4.65
  40. Affected versionversion=9.12.4.7
  41. Affected versionversion=9.12.4.8
  42. Affected versionversion=9.14.1
  43. Affected versionversion=9.14.1.10
  44. Affected versionversion=9.14.1.15
  45. Affected versionversion=9.14.1.19
  46. Affected versionversion=9.14.1.30
  47. Affected versionversion=9.14.1.6
  48. Affected versionversion=9.14.2
  49. Affected versionversion=9.14.2.13
  50. Affected versionversion=9.14.2.15
  51. Affected versionversion=9.14.2.4
  52. Affected versionversion=9.14.2.8
  53. Affected versionversion=9.14.3
  54. Affected versionversion=9.14.3.1
  55. Affected versionversion=9.14.3.11
  56. Affected versionversion=9.14.3.13
  57. Affected versionversion=9.14.3.15
  58. Affected versionversion=9.14.3.18
  59. Affected versionversion=9.14.3.9
  60. Affected versionversion=9.14.4
  61. Affected versionversion=9.14.4.12
  62. Affected versionversion=9.14.4.13
  63. Affected versionversion=9.14.4.14
  64. Affected versionversion=9.14.4.15
  65. Affected versionversion=9.14.4.17
  66. Affected versionversion=9.14.4.22
  67. Affected versionversion=9.14.4.23
  68. Affected versionversion=9.14.4.24
  69. Affected versionversion=9.14.4.6
  70. Affected versionversion=9.14.4.7
  71. Affected versionversion=9.15.1
  72. Affected versionversion=9.15.1.1
  73. Affected versionversion=9.15.1.10
  74. Affected versionversion=9.15.1.15
  75. Affected versionversion=9.15.1.16
  76. Affected versionversion=9.15.1.17
  77. Affected versionversion=9.15.1.21
  78. Affected versionversion=9.15.1.7
  79. Affected versionversion=9.16.1
  80. Affected versionversion=9.16.1.28
  81. Affected versionversion=9.16.2
  82. Affected versionversion=9.16.2.11
  83. Affected versionversion=9.16.2.13
  84. Affected versionversion=9.16.2.14
  85. Affected versionversion=9.16.2.3
  86. Affected versionversion=9.16.2.7
  87. Affected versionversion=9.16.3
  88. Affected versionversion=9.16.3.14
  89. Affected versionversion=9.16.3.15
  90. Affected versionversion=9.16.3.19
  91. Affected versionversion=9.16.3.23
  92. Affected versionversion=9.16.3.3
  93. Affected versionversion=9.16.4
  94. Affected versionversion=9.16.4.14
  95. Affected versionversion=9.16.4.18
  96. Affected versionversion=9.16.4.19
  97. Affected versionversion=9.16.4.27
  98. Affected versionversion=9.16.4.38
  99. Affected versionversion=9.16.4.39
  100. Affected versionversion=9.16.4.42
  101. Affected versionversion=9.16.4.48
  102. Affected versionversion=9.16.4.9
  103. Affected versionversion=9.17.1
  104. Affected versionversion=9.17.1.10
  105. Affected versionversion=9.17.1.11
  106. Affected versionversion=9.17.1.13
  107. Affected versionversion=9.17.1.15
  108. Affected versionversion=9.17.1.20
  109. Affected versionversion=9.17.1.30
  110. Affected versionversion=9.17.1.33
  111. Affected versionversion=9.17.1.7
  112. Affected versionversion=9.17.1.9
  113. Affected versionversion=9.18.1
  114. Affected versionversion=9.18.1.3
  115. Affected versionversion=9.18.2
  116. Affected versionversion=9.18.2.5
  117. Affected versionversion=9.18.2.7
  118. Affected versionversion=9.18.2.8
  119. Affected versionversion=9.18.3
  120. Affected versionversion=9.18.3.39
  121. Affected versionversion=9.18.3.46
  122. Affected versionversion=9.18.3.53
  123. Affected versionversion=9.18.3.55
  124. Affected versionversion=9.18.3.56
  125. Affected versionversion=9.18.4
  126. Affected versionversion=9.18.4.5
  127. Affected versionversion=9.18.4.8
  128. Affected versionversion=9.19.1
  129. Affected versionversion=9.19.1.12
  130. Affected versionversion=9.19.1.18
  131. Affected versionversion=9.19.1.22
  132. Affected versionversion=9.19.1.24
  133. Affected versionversion=9.19.1.27
  134. Affected versionversion=9.19.1.5
  135. Affected versionversion=9.19.1.9
  136. Affected versionversion=9.20.1
  137. Affected versionversion=9.20.1.5
  138. Affected versionversion=9.20.2
  139. Affected versionversion=9.8.1
  140. Affected versionversion=9.8.1.5
  141. Affected versionversion=9.8.1.7
  142. Affected versionversion=9.8.2
  143. Affected versionversion=9.8.2.14
  144. Affected versionversion=9.8.2.15
  145. Affected versionversion=9.8.2.17
  146. Affected versionversion=9.8.2.20
  147. Affected versionversion=9.8.2.24
  148. Affected versionversion=9.8.2.26
  149. Affected versionversion=9.8.2.28
  150. Affected versionversion=9.8.2.33
  151. Affected versionversion=9.8.2.35
  152. Affected versionversion=9.8.2.38
  153. Affected versionversion=9.8.2.45
  154. Affected versionversion=9.8.2.8
  155. Affected versionversion=9.8.3
  156. Affected versionversion=9.8.3.11
  157. Affected versionversion=9.8.3.14
  158. Affected versionversion=9.8.3.16
  159. Affected versionversion=9.8.3.18
  160. Affected versionversion=9.8.3.21
  161. Affected versionversion=9.8.3.26
  162. Affected versionversion=9.8.3.29
  163. Affected versionversion=9.8.3.8
  164. Affected versionversion=9.8.4
  165. Affected versionversion=9.8.4.10
  166. Affected versionversion=9.8.4.12
  167. Affected versionversion=9.8.4.15
  168. Affected versionversion=9.8.4.17
  169. Affected versionversion=9.8.4.20
  170. Affected versionversion=9.8.4.22
  171. Affected versionversion=9.8.4.25
  172. Affected versionversion=9.8.4.26
  173. Affected versionversion=9.8.4.29
  174. Affected versionversion=9.8.4.3
  175. Affected versionversion=9.8.4.32
  176. Affected versionversion=9.8.4.33
  177. Affected versionversion=9.8.4.34
  178. Affected versionversion=9.8.4.35
  179. Affected versionversion=9.8.4.39
  180. Affected versionversion=9.8.4.40
  181. Affected versionversion=9.8.4.41
  182. Affected versionversion=9.8.4.43
  183. Affected versionversion=9.8.4.44
  184. Affected versionversion=9.8.4.45
  185. Affected versionversion=9.8.4.46
  186. Affected versionversion=9.8.4.48
  187. Affected versionversion=9.8.4.7
  188. 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=9.12.2; 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=9.12.4.7; 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=9.14.2; 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=9.16.1; version=9.16.1.28; 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=9.16.4.9; 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=9.17.1.7; version=9.17.1.9; version=9.18.1; version=9.18.1.3; 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=9.18.4.5; 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=9.19.1.5; version=9.19.1.9; version=9.20.1; version=9.20.1.5; version=9.20.2; version=9.8.1; version=9.8.1.5; version=9.8.1.7; 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=6.2.3.7; 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=6.4.0.2; version=6.4.0.3; version=6.4.0.4; version=6.4.0.5; version=6.4.0.6; version=6.4.0.7; version=6.4.0.8; version=6.4.0.9; version=6.6.0; version=6.6.0.1; 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=7.0.0; version=7.0.0.1; 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=7.1.0; version=7.1.0.1; version=7.1.0.2; version=7.1.0.3; version=7.2.0; version=7.2.0.1; 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=7.3.0; version=7.3.1; version=7.3.1.1; version=7.3.1.2; version=7.4.0; version=7.4.1; version=7.4.1.1

Published CVSS scores

6.8CiscoCVSS:3.1/AV:N/AC:H/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-330Use of Insufficiently Random Values
CAPEC-112Brute Force
CAPEC-59Session Credential Falsification through Prediction
CAPEC-485Signature Spoofing by Key Recreation
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

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Your stack

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