CVE-2024-20355Network attack vector

Unauthorized VPN access via cross-profile SAML token replay

Published May 22, 2024 · Updated Aug 1, 2024

Authorization bypass in Cisco ASA and FTD Software allows remote authenticated users to access an unauthorized VPN tunnel group. The SAML 2.0 SSO implementation accepts a token returned for one connection profile when that token is submitted to another, failing to bind authorization to the original tunnel group. Exploitation requires valid remote-access VPN credentials and at least two SAML-authenticated tunnel groups, and it grants access to otherwise unauthorized secured networks.

CVSS severity5.0
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Cisco ASA and FTD Software allows remote authenticated users to access an unauthorized VPN tunnel group. The SAML 2.0 SSO implementation accepts a token returned for one connection profile when that token is submitted to another, failing to bind authorization to the original tunnel group. Exploitation requires valid remote-access VPN credentials and at least two SAML-authenticated tunnel groups, and it grants access to otherwise unauthorized secured networks.

The record

CVE
CVE-2024-20355
Published
May 22, 2024
Updated
Aug 1, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-862, T1078
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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=9.12.4.7
  39. Affected versionversion=9.12.4.8
  40. Affected versionversion=9.14.1
  41. Affected versionversion=9.14.1.10
  42. Affected versionversion=9.14.1.15
  43. Affected versionversion=9.14.1.19
  44. Affected versionversion=9.14.1.30
  45. Affected versionversion=9.14.1.6
  46. Affected versionversion=9.14.2
  47. Affected versionversion=9.14.2.13
  48. Affected versionversion=9.14.2.15
  49. Affected versionversion=9.14.2.4
  50. Affected versionversion=9.14.2.8
  51. Affected versionversion=9.14.3
  52. Affected versionversion=9.14.3.1
  53. Affected versionversion=9.14.3.11
  54. Affected versionversion=9.14.3.13
  55. Affected versionversion=9.14.3.15
  56. Affected versionversion=9.14.3.18
  57. Affected versionversion=9.14.3.9
  58. Affected versionversion=9.14.4
  59. Affected versionversion=9.14.4.12
  60. Affected versionversion=9.14.4.13
  61. Affected versionversion=9.14.4.14
  62. Affected versionversion=9.14.4.15
  63. Affected versionversion=9.14.4.17
  64. Affected versionversion=9.14.4.22
  65. Affected versionversion=9.14.4.23
  66. Affected versionversion=9.14.4.24
  67. Affected versionversion=9.14.4.6
  68. Affected versionversion=9.14.4.7
  69. Affected versionversion=9.15.1
  70. Affected versionversion=9.15.1.1
  71. Affected versionversion=9.15.1.10
  72. Affected versionversion=9.15.1.15
  73. Affected versionversion=9.15.1.16
  74. Affected versionversion=9.15.1.17
  75. Affected versionversion=9.15.1.21
  76. Affected versionversion=9.15.1.7
  77. Affected versionversion=9.16.1
  78. Affected versionversion=9.16.1.28
  79. Affected versionversion=9.16.2
  80. Affected versionversion=9.16.2.11
  81. Affected versionversion=9.16.2.13
  82. Affected versionversion=9.16.2.14
  83. Affected versionversion=9.16.2.3
  84. Affected versionversion=9.16.2.7
  85. Affected versionversion=9.16.3
  86. Affected versionversion=9.16.3.14
  87. Affected versionversion=9.16.3.15
  88. Affected versionversion=9.16.3.19
  89. Affected versionversion=9.16.3.23
  90. Affected versionversion=9.16.3.3
  91. Affected versionversion=9.16.4
  92. Affected versionversion=9.16.4.14
  93. Affected versionversion=9.16.4.18
  94. Affected versionversion=9.16.4.19
  95. Affected versionversion=9.16.4.9
  96. Affected versionversion=9.17.1
  97. Affected versionversion=9.17.1.10
  98. Affected versionversion=9.17.1.11
  99. Affected versionversion=9.17.1.13
  100. Affected versionversion=9.17.1.15
  101. Affected versionversion=9.17.1.20
  102. Affected versionversion=9.17.1.30
  103. Affected versionversion=9.17.1.7
  104. Affected versionversion=9.17.1.9
  105. Affected versionversion=9.18.1
  106. Affected versionversion=9.18.1.3
  107. Affected versionversion=9.18.2
  108. Affected versionversion=9.18.2.5
  109. Affected versionversion=9.18.2.7
  110. Affected versionversion=9.18.2.8
  111. Affected versionversion=9.18.3
  112. Affected versionversion=9.18.3.39
  113. Affected versionversion=9.19.1
  114. Affected versionversion=9.19.1.5
  115. Affected versionversion=9.19.1.9
  116. Affected versionversion=9.8.2.28
  117. Affected versionversion=9.8.2.33
  118. Affected versionversion=9.8.2.35
  119. Affected versionversion=9.8.2.38
  120. Affected versionversion=9.8.3
  121. Affected versionversion=9.8.3.11
  122. Affected versionversion=9.8.3.14
  123. Affected versionversion=9.8.3.16
  124. Affected versionversion=9.8.3.18
  125. Affected versionversion=9.8.3.21
  126. Affected versionversion=9.8.3.26
  127. Affected versionversion=9.8.3.29
  128. Affected versionversion=9.8.3.8
  129. Affected versionversion=9.8.4
  130. Affected versionversion=9.8.4.10
  131. Affected versionversion=9.8.4.12
  132. Affected versionversion=9.8.4.15
  133. Affected versionversion=9.8.4.17
  134. Affected versionversion=9.8.4.20
  135. Affected versionversion=9.8.4.22
  136. Affected versionversion=9.8.4.25
  137. Affected versionversion=9.8.4.26
  138. Affected versionversion=9.8.4.29
  139. Affected versionversion=9.8.4.3
  140. Affected versionversion=9.8.4.32
  141. Affected versionversion=9.8.4.33
  142. Affected versionversion=9.8.4.34
  143. Affected versionversion=9.8.4.35
  144. Affected versionversion=9.8.4.39
  145. Affected versionversion=9.8.4.40
  146. Affected versionversion=9.8.4.41
  147. Affected versionversion=9.8.4.43
  148. Affected versionversion=9.8.4.44
  149. Affected versionversion=9.8.4.45
  150. Affected versionversion=9.8.4.46
  151. Affected versionversion=9.8.4.48
  152. Affected versionversion=9.8.4.7
  153. Affected versionversion=9.8.4.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

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=9.12.4.7; 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=9.16.4.9; 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=9.17.1.7; 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=9.19.1; version=9.19.1.5; version=9.19.1.9; version=9.8.2.28; version=9.8.2.33; version=9.8.2.35; version=9.8.2.38; 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 Management Centerversion=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=6.4.0.2; 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=7.1.0; 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=7.3.0; version=7.3.1; version=7.3.1.1; version=7.3.1.2
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=6.4.0.2; 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=7.1.0; 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=7.3.0; version=7.3.1; version=7.3.1.1; version=7.3.1.2

Published CVSS scores

5.0CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1078Valid Accounts

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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