CVE-2024-20481Known exploitationNetwork attack vector

RAVPN outage via authentication-request resource exhaustion

Published Oct 23, 2024 · Updated Oct 21, 2025

Resource exhaustion in Cisco ASA and FTD Software RAVPN services allows remote attackers to interrupt VPN service with authentication requests. The RAVPN authentication path fails to release resources after requests complete, so a high request volume depletes service capacity. RAVPN must be enabled; exploitation requires no authentication, can force a device reload to restore VPN access, and leaves non-VPN services unaffected.

CVSS severity5.8
Medium
EPSS probability15.75%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Cisco ASA and FTD Software RAVPN services allows remote attackers to interrupt VPN service with authentication requests. The RAVPN authentication path fails to release resources after requests complete, so a high request volume depletes service capacity. RAVPN must be enabled; exploitation requires no authentication, can force a device reload to restore VPN access, and leaves non-VPN services unaffected.

The record

CVE
CVE-2024-20481
Published
Oct 23, 2024
Updated
Oct 21, 2025
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-772, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 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=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=9.12.4.67
  41. Affected versionversion=9.12.4.7
  42. Affected versionversion=9.12.4.8
  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=9.14.2
  50. Affected versionversion=9.14.2.13
  51. Affected versionversion=9.14.2.15
  52. Affected versionversion=9.14.2.4
  53. Affected versionversion=9.14.2.8
  54. Affected versionversion=9.14.3
  55. Affected versionversion=9.14.3.1
  56. Affected versionversion=9.14.3.11
  57. Affected versionversion=9.14.3.13
  58. Affected versionversion=9.14.3.15
  59. Affected versionversion=9.14.3.18
  60. Affected versionversion=9.14.3.9
  61. Affected versionversion=9.14.4
  62. Affected versionversion=9.14.4.12
  63. Affected versionversion=9.14.4.13
  64. Affected versionversion=9.14.4.14
  65. Affected versionversion=9.14.4.15
  66. Affected versionversion=9.14.4.17
  67. Affected versionversion=9.14.4.22
  68. Affected versionversion=9.14.4.23
  69. Affected versionversion=9.14.4.24
  70. Affected versionversion=9.14.4.6
  71. Affected versionversion=9.14.4.7
  72. Affected versionversion=9.15.1
  73. Affected versionversion=9.15.1.1
  74. Affected versionversion=9.15.1.10
  75. Affected versionversion=9.15.1.15
  76. Affected versionversion=9.15.1.16
  77. Affected versionversion=9.15.1.17
  78. Affected versionversion=9.15.1.21
  79. Affected versionversion=9.15.1.7
  80. Affected versionversion=9.16.1
  81. Affected versionversion=9.16.1.28
  82. Affected versionversion=9.16.2
  83. Affected versionversion=9.16.2.11
  84. Affected versionversion=9.16.2.13
  85. Affected versionversion=9.16.2.14
  86. Affected versionversion=9.16.2.3
  87. Affected versionversion=9.16.2.7
  88. Affected versionversion=9.16.3
  89. Affected versionversion=9.16.3.14
  90. Affected versionversion=9.16.3.15
  91. Affected versionversion=9.16.3.19
  92. Affected versionversion=9.16.3.23
  93. Affected versionversion=9.16.3.3
  94. Affected versionversion=9.16.4
  95. Affected versionversion=9.16.4.14
  96. Affected versionversion=9.16.4.18
  97. Affected versionversion=9.16.4.19
  98. Affected versionversion=9.16.4.27
  99. Affected versionversion=9.16.4.38
  100. Affected versionversion=9.16.4.39
  101. Affected versionversion=9.16.4.42
  102. Affected versionversion=9.16.4.48
  103. Affected versionversion=9.16.4.55
  104. Affected versionversion=9.16.4.57
  105. Affected versionversion=9.16.4.61
  106. Affected versionversion=9.16.4.9
  107. Affected versionversion=9.17.1
  108. Affected versionversion=9.17.1.10
  109. Affected versionversion=9.17.1.11
  110. Affected versionversion=9.17.1.13
  111. Affected versionversion=9.17.1.15
  112. Affected versionversion=9.17.1.20
  113. Affected versionversion=9.17.1.30
  114. Affected versionversion=9.17.1.33
  115. Affected versionversion=9.17.1.39
  116. Affected versionversion=9.17.1.7
  117. Affected versionversion=9.17.1.9
  118. Affected versionversion=9.18.1
  119. Affected versionversion=9.18.1.3
  120. Affected versionversion=9.18.2
  121. Affected versionversion=9.18.2.5
  122. Affected versionversion=9.18.2.7
  123. Affected versionversion=9.18.2.8
  124. Affected versionversion=9.18.3
  125. Affected versionversion=9.18.3.39
  126. Affected versionversion=9.18.3.46
  127. Affected versionversion=9.18.3.53
  128. Affected versionversion=9.18.3.55
  129. Affected versionversion=9.18.3.56
  130. Affected versionversion=9.18.4
  131. Affected versionversion=9.18.4.22
  132. Affected versionversion=9.18.4.24
  133. Affected versionversion=9.18.4.5
  134. Affected versionversion=9.18.4.8
  135. Affected versionversion=9.19.1
  136. Affected versionversion=9.19.1.12
  137. Affected versionversion=9.19.1.18
  138. Affected versionversion=9.19.1.22
  139. Affected versionversion=9.19.1.24
  140. Affected versionversion=9.19.1.27
  141. Affected versionversion=9.19.1.28
  142. Affected versionversion=9.19.1.31
  143. Affected versionversion=9.19.1.5
  144. Affected versionversion=9.19.1.9
  145. Affected versionversion=9.20.1
  146. Affected versionversion=9.20.1.5
  147. Affected versionversion=9.20.2
  148. Affected versionversion=9.20.2.10
  149. Affected versionversion=9.20.2.21
  150. Affected versionversion=9.8.1
  151. Affected versionversion=9.8.1.5
  152. Affected versionversion=9.8.1.7
  153. Affected versionversion=9.8.2
  154. Affected versionversion=9.8.2.14
  155. Affected versionversion=9.8.2.15
  156. Affected versionversion=9.8.2.17
  157. Affected versionversion=9.8.2.20
  158. Affected versionversion=9.8.2.24
  159. Affected versionversion=9.8.2.26
  160. Affected versionversion=9.8.2.28
  161. Affected versionversion=9.8.2.33
  162. Affected versionversion=9.8.2.35
  163. Affected versionversion=9.8.2.38
  164. Affected versionversion=9.8.2.45
  165. Affected versionversion=9.8.2.8
  166. Affected versionversion=9.8.3
  167. Affected versionversion=9.8.3.11
  168. Affected versionversion=9.8.3.14
  169. Affected versionversion=9.8.3.16
  170. Affected versionversion=9.8.3.18
  171. Affected versionversion=9.8.3.21
  172. Affected versionversion=9.8.3.26
  173. Affected versionversion=9.8.3.29
  174. Affected versionversion=9.8.3.8
  175. Affected versionversion=9.8.4
  176. Affected versionversion=9.8.4.10
  177. Affected versionversion=9.8.4.12
  178. Affected versionversion=9.8.4.15
  179. Affected versionversion=9.8.4.17
  180. Affected versionversion=9.8.4.20
  181. Affected versionversion=9.8.4.22
  182. Affected versionversion=9.8.4.25
  183. Affected versionversion=9.8.4.26
  184. Affected versionversion=9.8.4.29
  185. Affected versionversion=9.8.4.3
  186. Affected versionversion=9.8.4.32
  187. Affected versionversion=9.8.4.33
  188. Affected versionversion=9.8.4.34
  189. Affected versionversion=9.8.4.35
  190. Affected versionversion=9.8.4.39
  191. Affected versionversion=9.8.4.40
  192. Affected versionversion=9.8.4.41
  193. Affected versionversion=9.8.4.43
  194. Affected versionversion=9.8.4.44
  195. Affected versionversion=9.8.4.45
  196. Affected versionversion=9.8.4.46
  197. Affected versionversion=9.8.4.48
  198. Affected versionversion=9.8.4.7
  199. 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=9.12.4.67; 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=9.14.2; 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=9.16.4.55; 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=9.18.1; 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=9.18.4.22; version=9.18.4.24; 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=9.20.1; version=9.20.1.5; version=9.20.2; version=9.20.2.10; version=9.20.2.21; 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=6.4.0.18; 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=6.4.0.7; 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=7.0.6.2; 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=7.2.6; version=7.2.7; version=7.2.8; version=7.2.8.1; 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

5.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
5.8CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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 exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
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.

Reported exploitation

Technologies

Your stack

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Your stack

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