CVE-2023-20245Network attack vector

Unauthenticated ACL bypass via per-user override logic

Published Nov 1, 2023 · Updated Aug 2, 2024

ACL bypass in Cisco ASA and FTD Software allows remote attackers to reach protected resources through affected VPN configurations. The per-user-override logic incorrectly constructs and applies rules so traffic denied by an interface ACL is permitted. Exposure requires permit-vpn to be disabled, per-user-override on an interface ACL, a vpn-filter group policy, and an active associated VPN tunnel.

CVSS severity5.8
Medium
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ACL bypass in Cisco ASA and FTD Software allows remote attackers to reach protected resources through affected VPN configurations. The per-user-override logic incorrectly constructs and applies rules so traffic denied by an interface ACL is permitted. Exposure requires permit-vpn to be disabled, per-user-override on an interface ACL, a vpn-filter group policy, and an active associated VPN tunnel.

The record

CVE
CVE-2023-20245
Published
Nov 1, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 1, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=9.12.4.7
  38. Affected versionversion=9.12.4.8
  39. Affected versionversion=9.14.1
  40. Affected versionversion=9.14.1.10
  41. Affected versionversion=9.14.1.15
  42. Affected versionversion=9.14.1.19
  43. Affected versionversion=9.14.1.30
  44. Affected versionversion=9.14.1.6
  45. Affected versionversion=9.14.2
  46. Affected versionversion=9.14.2.13
  47. Affected versionversion=9.14.2.15
  48. Affected versionversion=9.14.2.4
  49. Affected versionversion=9.14.2.8
  50. Affected versionversion=9.14.3
  51. Affected versionversion=9.14.3.1
  52. Affected versionversion=9.14.3.11
  53. Affected versionversion=9.14.3.13
  54. Affected versionversion=9.14.3.15
  55. Affected versionversion=9.14.3.18
  56. Affected versionversion=9.14.3.9
  57. Affected versionversion=9.14.4
  58. Affected versionversion=9.14.4.12
  59. Affected versionversion=9.14.4.13
  60. Affected versionversion=9.14.4.14
  61. Affected versionversion=9.14.4.15
  62. Affected versionversion=9.14.4.17
  63. Affected versionversion=9.14.4.22
  64. Affected versionversion=9.14.4.23
  65. Affected versionversion=9.14.4.6
  66. Affected versionversion=9.14.4.7
  67. Affected versionversion=9.15.1
  68. Affected versionversion=9.15.1.1
  69. Affected versionversion=9.15.1.10
  70. Affected versionversion=9.15.1.15
  71. Affected versionversion=9.15.1.16
  72. Affected versionversion=9.15.1.17
  73. Affected versionversion=9.15.1.21
  74. Affected versionversion=9.15.1.7
  75. Affected versionversion=9.16.1
  76. Affected versionversion=9.16.1.28
  77. Affected versionversion=9.16.2
  78. Affected versionversion=9.16.2.11
  79. Affected versionversion=9.16.2.13
  80. Affected versionversion=9.16.2.14
  81. Affected versionversion=9.16.2.3
  82. Affected versionversion=9.16.2.7
  83. Affected versionversion=9.16.3
  84. Affected versionversion=9.16.3.14
  85. Affected versionversion=9.16.3.15
  86. Affected versionversion=9.16.3.19
  87. Affected versionversion=9.16.3.23
  88. Affected versionversion=9.16.3.3
  89. Affected versionversion=9.16.4
  90. Affected versionversion=9.16.4.14
  91. Affected versionversion=9.16.4.18
  92. Affected versionversion=9.16.4.9
  93. Affected versionversion=9.17.1
  94. Affected versionversion=9.17.1.10
  95. Affected versionversion=9.17.1.11
  96. Affected versionversion=9.17.1.13
  97. Affected versionversion=9.17.1.15
  98. Affected versionversion=9.17.1.20
  99. Affected versionversion=9.17.1.30
  100. Affected versionversion=9.17.1.7
  101. Affected versionversion=9.17.1.9
  102. Affected versionversion=9.18.1
  103. Affected versionversion=9.18.1.3
  104. Affected versionversion=9.18.2
  105. Affected versionversion=9.18.2.5
  106. Affected versionversion=9.18.2.7
  107. Affected versionversion=9.18.2.8
  108. Affected versionversion=9.18.3
  109. Affected versionversion=9.19.1
  110. Affected versionversion=9.19.1.5
  111. Affected versionversion=9.19.1.9
  112. Affected versionversion=9.8.3.14
  113. Affected versionversion=9.8.3.16
  114. Affected versionversion=9.8.3.18
  115. Affected versionversion=9.8.3.21
  116. Affected versionversion=9.8.3.26
  117. Affected versionversion=9.8.3.29
  118. Affected versionversion=9.8.4
  119. Affected versionversion=9.8.4.10
  120. Affected versionversion=9.8.4.12
  121. Affected versionversion=9.8.4.15
  122. Affected versionversion=9.8.4.17
  123. Affected versionversion=9.8.4.20
  124. Affected versionversion=9.8.4.22
  125. Affected versionversion=9.8.4.25
  126. Affected versionversion=9.8.4.26
  127. Affected versionversion=9.8.4.29
  128. Affected versionversion=9.8.4.3
  129. Affected versionversion=9.8.4.32
  130. Affected versionversion=9.8.4.33
  131. Affected versionversion=9.8.4.34
  132. Affected versionversion=9.8.4.35
  133. Affected versionversion=9.8.4.39
  134. Affected versionversion=9.8.4.40
  135. Affected versionversion=9.8.4.41
  136. Affected versionversion=9.8.4.43
  137. Affected versionversion=9.8.4.44
  138. Affected versionversion=9.8.4.45
  139. Affected versionversion=9.8.4.46
  140. Affected versionversion=9.8.4.48
  141. Affected versionversion=9.8.4.7
  142. 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=9.12.4.7; 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=9.14.4.6; 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=9.16.4.9; 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=9.19.1; version=9.19.1.5; version=9.19.1.9; 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=9.8.4; 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=6.2.3.10; 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=6.2.3.3; 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=6.7.0; 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=7.3.0; version=7.3.1; version=7.3.1.1

Published CVSS scores

5.8Cisco PSIRTCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

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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