CVE-2024-20260Network attack vector

Service interruption via unreclaimed TLS connection memory

Published Oct 23, 2024 · Updated Oct 24, 2024

Resource exhaustion in Cisco ASAv and FTDv allows remote attackers to interrupt SSL VPN and management service via TLS connections. The virtual platforms fail to reclaim memory properly for large volumes of new SSL/TLS connections, eventually exhausting system memory. Exploitation requires no authentication but requires an SSL/TLS-processing feature; service recovers slowly after traffic stops and can require a manual reload.

CVSS severity8.6
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Cisco ASAv and FTDv allows remote attackers to interrupt SSL VPN and management service via TLS connections. The virtual platforms fail to reclaim memory properly for large volumes of new SSL/TLS connections, eventually exhausting system memory. Exploitation requires no authentication but requires an SSL/TLS-processing feature; service recovers slowly after traffic stops and can require a manual reload.

The record

CVE
CVE-2024-20260
Published
Oct 23, 2024
Updated
Oct 24, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-789, T1499.003
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=9.14.1
  44. Affected versionversion=9.14.1.10
  45. Affected versionversion=9.14.1.15
  46. Affected versionversion=9.14.1.19
  47. Affected versionversion=9.14.1.30
  48. Affected versionversion=9.14.1.6
  49. Affected versionversion=9.14.1 <=9.14.4.24
  50. Affected versionversion=9.14.2
  51. Affected versionversion=9.14.2.13
  52. Affected versionversion=9.14.2.15
  53. Affected versionversion=9.14.2.4
  54. Affected versionversion=9.14.2.8
  55. Affected versionversion=9.14.3
  56. Affected versionversion=9.14.3.1
  57. Affected versionversion=9.14.3.11
  58. Affected versionversion=9.14.3.13
  59. Affected versionversion=9.14.3.15
  60. Affected versionversion=9.14.3.18
  61. Affected versionversion=9.14.3.9
  62. Affected versionversion=9.14.4
  63. Affected versionversion=9.14.4.12
  64. Affected versionversion=9.14.4.13
  65. Affected versionversion=9.14.4.14
  66. Affected versionversion=9.14.4.15
  67. Affected versionversion=9.14.4.17
  68. Affected versionversion=9.14.4.22
  69. Affected versionversion=9.14.4.23
  70. Affected versionversion=9.14.4.24
  71. Affected versionversion=9.14.4.6
  72. Affected versionversion=9.14.4.7
  73. Affected versionversion=9.15.1
  74. Affected versionversion=9.15.1.1
  75. Affected versionversion=9.15.1.10
  76. Affected versionversion=9.15.1.15
  77. Affected versionversion=9.15.1.16
  78. Affected versionversion=9.15.1.17
  79. Affected versionversion=9.15.1.21
  80. Affected versionversion=9.15.1.7
  81. Affected versionversion=9.15.1 <=9.15.1.21
  82. Affected versionversion=9.16.1
  83. Affected versionversion=9.16.1.28
  84. Affected versionversion=9.16.1 <=9.16.4.61
  85. Affected versionversion=9.16.2
  86. Affected versionversion=9.16.2.11
  87. Affected versionversion=9.16.2.13
  88. Affected versionversion=9.16.2.14
  89. Affected versionversion=9.16.2.3
  90. Affected versionversion=9.16.2.7
  91. Affected versionversion=9.16.3
  92. Affected versionversion=9.16.3.14
  93. Affected versionversion=9.16.3.15
  94. Affected versionversion=9.16.3.19
  95. Affected versionversion=9.16.3.23
  96. Affected versionversion=9.16.3.3
  97. Affected versionversion=9.16.4
  98. Affected versionversion=9.16.4.14
  99. Affected versionversion=9.16.4.18
  100. Affected versionversion=9.16.4.19
  101. Affected versionversion=9.16.4.27
  102. Affected versionversion=9.16.4.38
  103. Affected versionversion=9.16.4.39
  104. Affected versionversion=9.16.4.42
  105. Affected versionversion=9.16.4.48
  106. Affected versionversion=9.16.4.55
  107. Affected versionversion=9.16.4.57
  108. Affected versionversion=9.16.4.61
  109. Affected versionversion=9.16.4.9
  110. Affected versionversion=9.17.1
  111. Affected versionversion=9.17.1.10
  112. Affected versionversion=9.17.1.11
  113. Affected versionversion=9.17.1.13
  114. Affected versionversion=9.17.1.15
  115. Affected versionversion=9.17.1 <=19.17.1.39
  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=9.18.1
  123. Affected versionversion=9.18.1.3
  124. Affected versionversion=9.18.1 <=9.18.4.29
  125. Affected versionversion=9.18.2
  126. Affected versionversion=9.18.2.5
  127. Affected versionversion=9.18.2.7
  128. Affected versionversion=9.18.2.8
  129. Affected versionversion=9.18.3
  130. Affected versionversion=9.18.3.39
  131. Affected versionversion=9.18.3.46
  132. Affected versionversion=9.18.3.53
  133. Affected versionversion=9.18.3.55
  134. Affected versionversion=9.18.3.56
  135. Affected versionversion=9.18.4
  136. Affected versionversion=9.18.4.22
  137. Affected versionversion=9.18.4.24
  138. Affected versionversion=9.18.4.29
  139. Affected versionversion=9.18.4.5
  140. Affected versionversion=9.18.4.8
  141. Affected versionversion=9.19.1
  142. Affected versionversion=9.19.1.12
  143. Affected versionversion=9.19.1.18
  144. Affected versionversion=9.19.1.22
  145. Affected versionversion=9.19.1.24
  146. Affected versionversion=9.19.1.27
  147. Affected versionversion=9.19.1.28
  148. Affected versionversion=9.19.1.31
  149. Affected versionversion=9.19.1.5
  150. Affected versionversion=9.19.1.9
  151. Affected versionversion=9.19.1 <=9.19.1.31
  152. Affected versionversion=9.20.2
  153. Affected versionversion=9.20.2.10
  154. Affected versionversion=9.20.2.21
  155. Affected versionversion=9.20.2 <=9.20.2.21
  156. Affected versionversion=9.8.1
  157. Affected versionversion=9.8.1.5
  158. Affected versionversion=9.8.1.7
  159. Affected versionversion=9.8.1 <=9.8.4.48
  160. Affected versionversion=9.8.2
  161. Affected versionversion=9.8.2.14
  162. Affected versionversion=9.8.2.15
  163. Affected versionversion=9.8.2.17
  164. Affected versionversion=9.8.2.20
  165. Affected versionversion=9.8.2.24
  166. Affected versionversion=9.8.2.26
  167. Affected versionversion=9.8.2.28
  168. Affected versionversion=9.8.2.33
  169. Affected versionversion=9.8.2.35
  170. Affected versionversion=9.8.2.38
  171. Affected versionversion=9.8.2.45
  172. Affected versionversion=9.8.2.8
  173. Affected versionversion=9.8.3
  174. Affected versionversion=9.8.3.11
  175. Affected versionversion=9.8.3.14
  176. Affected versionversion=9.8.3.16
  177. Affected versionversion=9.8.3.18
  178. Affected versionversion=9.8.3.21
  179. Affected versionversion=9.8.3.26
  180. Affected versionversion=9.8.3.29
  181. Affected versionversion=9.8.3.8
  182. Affected versionversion=9.8.4
  183. Affected versionversion=9.8.4.10
  184. Affected versionversion=9.8.4.12
  185. Affected versionversion=9.8.4.15
  186. Affected versionversion=9.8.4.17
  187. Affected versionversion=9.8.4.20
  188. Affected versionversion=9.8.4.22
  189. Affected versionversion=9.8.4.25
  190. Affected versionversion=9.8.4.26
  191. Affected versionversion=9.8.4.29
  192. Affected versionversion=9.8.4.3
  193. Affected versionversion=9.8.4.32
  194. Affected versionversion=9.8.4.34
  195. Affected versionversion=9.8.4.35
  196. Affected versionversion=9.8.4.39
  197. Affected versionversion=9.8.4.40
  198. Affected versionversion=9.8.4.41
  199. Affected versionversion=9.8.4.43
  200. Affected versionversion=9.8.4.44
  201. Affected versionversion=9.8.4.45
  202. Affected versionversion=9.8.4.46
  203. Affected versionversion=9.8.4.48
  204. Affected versionversion=9.8.4.7
  205. 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=9.14.1; 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 <=19.17.1.39; 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=9.18.1; 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=9.20.2; version=9.20.2.10; version=9.20.2.21; version=9.20.2 <=9.20.2.21; 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=9.8.4.34; 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=7.1.0.3; 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; version=7.4.1; version=7.4.1.1; version=7.4.1 <=7.4.1.1

Published CVSS scores

8.6CiscoCVSS: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 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-789Memory Allocation with Excessive Size Value
T1499.003Application Exhaustion 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

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