CVE-2023-20086Network attack vector

Device reload via crafted ICMPv6 messages

Published Nov 1, 2023 · Updated Aug 2, 2024

ICMPv6 processing flaws in Cisco ASA and Firepower Threat Defense Software allow remote attackers to reload IPv6-enabled devices. The ICMPv6 message-processing path improperly handles a crafted message and raises an uncaught exception that forces the appliance to reload. The target must run an affected ASA or FTD release with IPv6 configured; IPv4-only devices are unaffected, and the consequence is a service interruption during reload.

CVSS severity8.6
High
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ICMPv6 processing flaws in Cisco ASA and Firepower Threat Defense Software allow remote attackers to reload IPv6-enabled devices. The ICMPv6 message-processing path improperly handles a crafted message and raises an uncaught exception that forces the appliance to reload. The target must run an affected ASA or FTD release with IPv6 configured; IPv4-only devices are unaffected, and the consequence is a service interruption during reload.

The record

CVE
CVE-2023-20086
Published
Nov 1, 2023
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-248, T1499.004
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=9.12.4.7
  37. Affected versionversion=9.12.4.8
  38. Affected versionversion=9.14.1
  39. Affected versionversion=9.14.1.10
  40. Affected versionversion=9.14.1.15
  41. Affected versionversion=9.14.1.19
  42. Affected versionversion=9.14.1.30
  43. Affected versionversion=9.14.2
  44. Affected versionversion=9.14.2.13
  45. Affected versionversion=9.14.2.15
  46. Affected versionversion=9.14.2.4
  47. Affected versionversion=9.14.2.8
  48. Affected versionversion=9.14.3
  49. Affected versionversion=9.14.3.1
  50. Affected versionversion=9.14.3.11
  51. Affected versionversion=9.14.3.13
  52. Affected versionversion=9.14.3.15
  53. Affected versionversion=9.14.3.18
  54. Affected versionversion=9.14.3.9
  55. Affected versionversion=9.14.4
  56. Affected versionversion=9.14.4.12
  57. Affected versionversion=9.14.4.13
  58. Affected versionversion=9.14.4.14
  59. Affected versionversion=9.14.4.15
  60. Affected versionversion=9.14.4.17
  61. Affected versionversion=9.14.4.22
  62. Affected versionversion=9.14.4.6
  63. Affected versionversion=9.14.4.7
  64. Affected versionversion=9.15.1
  65. Affected versionversion=9.15.1.1
  66. Affected versionversion=9.15.1.10
  67. Affected versionversion=9.15.1.15
  68. Affected versionversion=9.15.1.16
  69. Affected versionversion=9.15.1.17
  70. Affected versionversion=9.15.1.21
  71. Affected versionversion=9.15.1.7
  72. Affected versionversion=9.16.1
  73. Affected versionversion=9.16.1.28
  74. Affected versionversion=9.16.2
  75. Affected versionversion=9.16.2.11
  76. Affected versionversion=9.16.2.13
  77. Affected versionversion=9.16.2.14
  78. Affected versionversion=9.16.2.3
  79. Affected versionversion=9.16.2.7
  80. Affected versionversion=9.16.3
  81. Affected versionversion=9.16.3.14
  82. Affected versionversion=9.16.3.15
  83. Affected versionversion=9.16.3.19
  84. Affected versionversion=9.16.3.23
  85. Affected versionversion=9.16.3.3
  86. Affected versionversion=9.16.4
  87. Affected versionversion=9.16.4.9
  88. Affected versionversion=9.17.1
  89. Affected versionversion=9.17.1.10
  90. Affected versionversion=9.17.1.11
  91. Affected versionversion=9.17.1.13
  92. Affected versionversion=9.17.1.15
  93. Affected versionversion=9.17.1.20
  94. Affected versionversion=9.17.1.7
  95. Affected versionversion=9.17.1.9
  96. Affected versionversion=9.18.1
  97. Affected versionversion=9.18.1.3
  98. Affected versionversion=9.18.2
  99. Affected versionversion=9.18.2.5
  100. Affected versionversion=9.18.2.7
  101. Affected versionversion=9.18.2.8
  102. Affected versionversion=9.19.1
  103. Affected versionversion=9.8.1
  104. Affected versionversion=9.8.1.5
  105. Affected versionversion=9.8.1.7
  106. Affected versionversion=9.8.2
  107. Affected versionversion=9.8.2.14
  108. Affected versionversion=9.8.2.15
  109. Affected versionversion=9.8.2.17
  110. Affected versionversion=9.8.2.20
  111. Affected versionversion=9.8.2.24
  112. Affected versionversion=9.8.2.26
  113. Affected versionversion=9.8.2.28
  114. Affected versionversion=9.8.2.33
  115. Affected versionversion=9.8.2.35
  116. Affected versionversion=9.8.2.38
  117. Affected versionversion=9.8.2.8
  118. Affected versionversion=9.8.3
  119. Affected versionversion=9.8.3.11
  120. Affected versionversion=9.8.3.14
  121. Affected versionversion=9.8.3.16
  122. Affected versionversion=9.8.3.18
  123. Affected versionversion=9.8.3.21
  124. Affected versionversion=9.8.3.26
  125. Affected versionversion=9.8.3.29
  126. Affected versionversion=9.8.3.8
  127. Affected versionversion=9.8.4
  128. Affected versionversion=9.8.4.10
  129. Affected versionversion=9.8.4.12
  130. Affected versionversion=9.8.4.15
  131. Affected versionversion=9.8.4.17
  132. Affected versionversion=9.8.4.20
  133. Affected versionversion=9.8.4.22
  134. Affected versionversion=9.8.4.25
  135. Affected versionversion=9.8.4.26
  136. Affected versionversion=9.8.4.29
  137. Affected versionversion=9.8.4.3
  138. Affected versionversion=9.8.4.32
  139. Affected versionversion=9.8.4.33
  140. Affected versionversion=9.8.4.34
  141. Affected versionversion=9.8.4.35
  142. Affected versionversion=9.8.4.39
  143. Affected versionversion=9.8.4.40
  144. Affected versionversion=9.8.4.41
  145. Affected versionversion=9.8.4.43
  146. Affected versionversion=9.8.4.44
  147. Affected versionversion=9.8.4.45
  148. Affected versionversion=9.8.4.46
  149. Affected versionversion=9.8.4.48
  150. Affected versionversion=9.8.4.7
  151. 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=9.12.4.7; 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=9.14.2; 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=9.14.4.6; 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=9.16.4.9; 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=9.17.1.7; 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=9.19.1; 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=9.8.2.8; 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=6.4.0.2; 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

8.6Cisco Systems, Inc.CVSS: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-248Uncaught Exception
T1499.004Endpoint Denial of Service: Application 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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