CVE-2024-20316Network attack vector

Unauthenticated ACL bypass via mishandled update errors

Published Mar 27, 2024 · Updated Aug 1, 2024

Access control bypass in Cisco IOS XE Software allows remote attackers to reach resources protected by a configured IPv4 ACL. DMI services mishandle an error when an authorized administrator uses NETCONF or RESTCONF to update an ACL in a way that reorders its ACEs. Exposure requires a vulnerable release, a default-disabled management protocol, and either a standard IPv4 ACL or an extended IPv4 ACL with log options.

CVSS severity5.8
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control bypass in Cisco IOS XE Software allows remote attackers to reach resources protected by a configured IPv4 ACL. DMI services mishandle an error when an authorized administrator uses NETCONF or RESTCONF to update an ACL in a way that reorders its ACEs. Exposure requires a vulnerable release, a default-disabled management protocol, and either a standard IPv4 ACL or an extended IPv4 ACL with log options.

The record

CVE
CVE-2024-20316
Published
Mar 27, 2024
Updated
Aug 1, 2024
Vendor
ClamAV
Product
Cisco IOS XE Software
Classifications
CWE-390, T1562.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 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=16.10.1
  2. Affected versionversion=16.10.1a
  3. Affected versionversion=16.10.1b
  4. Affected versionversion=16.10.1e
  5. Affected versionversion=16.10.1s
  6. Affected versionversion=16.10.2
  7. Affected versionversion=16.10.3
  8. Affected versionversion=16.11.1
  9. Affected versionversion=16.11.1a
  10. Affected versionversion=16.11.1b
  11. Affected versionversion=16.11.1s
  12. Affected versionversion=16.11.2
  13. Affected versionversion=16.12.1
  14. Affected versionversion=16.12.10
  15. Affected versionversion=16.12.10a
  16. Affected versionversion=16.12.11
  17. Affected versionversion=16.12.1a
  18. Affected versionversion=16.12.1c
  19. Affected versionversion=16.12.1s
  20. Affected versionversion=16.12.1t
  21. Affected versionversion=16.12.2
  22. Affected versionversion=16.12.2a
  23. Affected versionversion=16.12.2s
  24. Affected versionversion=16.12.3
  25. Affected versionversion=16.12.3a
  26. Affected versionversion=16.12.3s
  27. Affected versionversion=16.12.4
  28. Affected versionversion=16.12.4a
  29. Affected versionversion=16.12.5
  30. Affected versionversion=16.12.5a
  31. Affected versionversion=16.12.5b
  32. Affected versionversion=16.12.6
  33. Affected versionversion=16.12.6a
  34. Affected versionversion=16.12.7
  35. Affected versionversion=16.12.8
  36. Affected versionversion=16.12.9
  37. Affected versionversion=16.3.1
  38. Affected versionversion=16.3.10
  39. Affected versionversion=16.3.11
  40. Affected versionversion=16.3.1a
  41. Affected versionversion=16.3.2
  42. Affected versionversion=16.3.3
  43. Affected versionversion=16.3.4
  44. Affected versionversion=16.3.5
  45. Affected versionversion=16.3.5b
  46. Affected versionversion=16.3.6
  47. Affected versionversion=16.3.7
  48. Affected versionversion=16.3.8
  49. Affected versionversion=16.3.9
  50. Affected versionversion=16.4.1
  51. Affected versionversion=16.4.2
  52. Affected versionversion=16.4.3
  53. Affected versionversion=16.5.1
  54. Affected versionversion=16.5.1a
  55. Affected versionversion=16.5.1b
  56. Affected versionversion=16.5.2
  57. Affected versionversion=16.5.3
  58. Affected versionversion=16.6.1
  59. Affected versionversion=16.6.10
  60. Affected versionversion=16.6.2
  61. Affected versionversion=16.6.3
  62. Affected versionversion=16.6.4
  63. Affected versionversion=16.6.4a
  64. Affected versionversion=16.6.5
  65. Affected versionversion=16.6.5a
  66. Affected versionversion=16.6.6
  67. Affected versionversion=16.6.7
  68. Affected versionversion=16.6.8
  69. Affected versionversion=16.6.9
  70. Affected versionversion=16.7.1
  71. Affected versionversion=16.7.2
  72. Affected versionversion=16.7.3
  73. Affected versionversion=16.8.1
  74. Affected versionversion=16.8.1a
  75. Affected versionversion=16.8.1b
  76. Affected versionversion=16.8.1c
  77. Affected versionversion=16.8.1s
  78. Affected versionversion=16.8.2
  79. Affected versionversion=16.8.3
  80. Affected versionversion=16.9.1
  81. Affected versionversion=16.9.1a
  82. Affected versionversion=16.9.1b
  83. Affected versionversion=16.9.1s
  84. Affected versionversion=16.9.2
  85. Affected versionversion=16.9.3
  86. Affected versionversion=16.9.3a
  87. Affected versionversion=16.9.4
  88. Affected versionversion=16.9.5
  89. Affected versionversion=16.9.5f
  90. Affected versionversion=16.9.6
  91. Affected versionversion=16.9.7
  92. Affected versionversion=16.9.8
  93. Affected versionversion=17.10.1
  94. Affected versionversion=17.10.1a
  95. Affected versionversion=17.10.1b
  96. Affected versionversion=17.1.1
  97. Affected versionversion=17.11.1
  98. Affected versionversion=17.11.1a
  99. Affected versionversion=17.11.99SW
  100. Affected versionversion=17.1.1a
  101. Affected versionversion=17.1.1s
  102. Affected versionversion=17.1.1t
  103. Affected versionversion=17.12.1
  104. Affected versionversion=17.12.1a
  105. Affected versionversion=17.12.2
  106. Affected versionversion=17.12.2a
  107. Affected versionversion=17.1.3
  108. Affected versionversion=17.2.1
  109. Affected versionversion=17.2.1a
  110. Affected versionversion=17.2.1r
  111. Affected versionversion=17.2.1v
  112. Affected versionversion=17.2.2
  113. Affected versionversion=17.2.3
  114. Affected versionversion=17.3.1
  115. Affected versionversion=17.3.1a
  116. Affected versionversion=17.3.2
  117. Affected versionversion=17.3.2a
  118. Affected versionversion=17.3.3
  119. Affected versionversion=17.3.4
  120. Affected versionversion=17.3.4a
  121. Affected versionversion=17.3.4b
  122. Affected versionversion=17.3.4c
  123. Affected versionversion=17.3.5
  124. Affected versionversion=17.3.5a
  125. Affected versionversion=17.3.5b
  126. Affected versionversion=17.3.6
  127. Affected versionversion=17.3.7
  128. Affected versionversion=17.3.8
  129. Affected versionversion=17.3.8a
  130. Affected versionversion=17.4.1
  131. Affected versionversion=17.4.1a
  132. Affected versionversion=17.4.1b
  133. Affected versionversion=17.4.2
  134. Affected versionversion=17.4.2a
  135. Affected versionversion=17.5.1
  136. Affected versionversion=17.5.1a
  137. Affected versionversion=17.6.1
  138. Affected versionversion=17.6.1a
  139. Affected versionversion=17.6.2
  140. Affected versionversion=17.6.3
  141. Affected versionversion=17.6.3a
  142. Affected versionversion=17.6.4
  143. Affected versionversion=17.6.5
  144. Affected versionversion=17.6.5a
  145. Affected versionversion=17.6.6
  146. Affected versionversion=17.6.6a
  147. Affected versionversion=17.7.1
  148. Affected versionversion=17.7.1a
  149. Affected versionversion=17.7.1b
  150. Affected versionversion=17.7.2
  151. Affected versionversion=17.8.1
  152. Affected versionversion=17.8.1a
  153. Affected versionversion=17.9.1
  154. Affected versionversion=17.9.1a
  155. Affected versionversion=17.9.2
  156. Affected versionversion=17.9.2a
  157. Affected versionversion=17.9.3
  158. Affected versionversion=17.9.3a
  159. Affected versionversion=17.9.4
  160. Affected versionversion=17.9.4a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XE Softwareversion=16.10.1; version=16.10.1a; version=16.10.1b; version=16.10.1e; version=16.10.1s; version=16.10.2; version=16.10.3; version=16.11.1; version=16.11.1a; version=16.11.1b; version=16.11.1s; version=16.11.2; version=16.12.1; version=16.12.10; version=16.12.10a; version=16.12.11; version=16.12.1a; version=16.12.1c; version=16.12.1s; version=16.12.1t; version=16.12.2; version=16.12.2a; version=16.12.2s; version=16.12.3; version=16.12.3a; version=16.12.3s; version=16.12.4; version=16.12.4a; version=16.12.5; version=16.12.5a; version=16.12.5b; version=16.12.6; version=16.12.6a; version=16.12.7; version=16.12.8; version=16.12.9; version=16.3.1; version=16.3.10; version=16.3.11; version=16.3.1a; version=16.3.2; version=16.3.3; version=16.3.4; version=16.3.5; version=16.3.5b; version=16.3.6; version=16.3.7; version=16.3.8; version=16.3.9; version=16.4.1; version=16.4.2; version=16.4.3; version=16.5.1; version=16.5.1a; version=16.5.1b; version=16.5.2; version=16.5.3; version=16.6.1; version=16.6.10; version=16.6.2; version=16.6.3; version=16.6.4; version=16.6.4a; version=16.6.5; version=16.6.5a; version=16.6.6; version=16.6.7; version=16.6.8; version=16.6.9; version=16.7.1; version=16.7.2; version=16.7.3; version=16.8.1; version=16.8.1a; version=16.8.1b; version=16.8.1c; version=16.8.1s; version=16.8.2; version=16.8.3; version=16.9.1; version=16.9.1a; version=16.9.1b; version=16.9.1s; version=16.9.2; version=16.9.3; version=16.9.3a; version=16.9.4; version=16.9.5; version=16.9.5f; version=16.9.6; version=16.9.7; version=16.9.8; version=17.10.1; version=17.10.1a; version=17.10.1b; version=17.1.1; version=17.11.1; version=17.11.1a; version=17.11.99SW; version=17.1.1a; version=17.1.1s; version=17.1.1t; version=17.12.1; version=17.12.1a; version=17.12.2; version=17.12.2a; version=17.1.3; version=17.2.1; version=17.2.1a; version=17.2.1r; version=17.2.1v; version=17.2.2; version=17.2.3; version=17.3.1; version=17.3.1a; version=17.3.2; version=17.3.2a; version=17.3.3; version=17.3.4; version=17.3.4a; version=17.3.4b; version=17.3.4c; version=17.3.5; version=17.3.5a; version=17.3.5b; version=17.3.6; version=17.3.7; version=17.3.8; version=17.3.8a; version=17.4.1; version=17.4.1a; version=17.4.1b; version=17.4.2; version=17.4.2a; version=17.5.1; version=17.5.1a; version=17.6.1; version=17.6.1a; version=17.6.2; version=17.6.3; version=17.6.3a; version=17.6.4; version=17.6.5; version=17.6.5a; version=17.6.6; version=17.6.6a; version=17.7.1; version=17.7.1a; version=17.7.1b; version=17.7.2; version=17.8.1; version=17.8.1a; version=17.9.1; version=17.9.1a; version=17.9.2; version=17.9.2a; version=17.9.3; version=17.9.3a; version=17.9.4; version=17.9.4a

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
5.8Cisco Systems, Inc.CVSS: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-390Detection of Error Condition Without Action
T1562.004Impair Defenses: Disable or Modify System Firewall

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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