CVE-2024-20267Network attack vector

Network interruption via unchecked MPLS frame handling

Published Feb 28, 2024 · Updated Aug 28, 2024

Denial of service in Cisco NX-OS Software allows remote attackers to restart netstack or reload affected MPLS-enabled switches. Ingress MPLS frame handling fails to check errors while processing a crafted encapsulated IPv6 packet. The target must run a vulnerable release with MPLS configured; the IPv6 packet can originate multiple hops away before MPLS encapsulation.

CVSS severity8.6
High
EPSS probability0.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Cisco NX-OS Software allows remote attackers to restart netstack or reload affected MPLS-enabled switches. Ingress MPLS frame handling fails to check errors while processing a crafted encapsulated IPv6 packet. The target must run a vulnerable release with MPLS configured; the IPv6 packet can originate multiple hops away before MPLS encapsulation.

The record

CVE
CVE-2024-20267
Published
Feb 28, 2024
Updated
Aug 28, 2024
Vendor
ClamAV
Product
Cisco NX-OS Software
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 28, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=10.1(1)
  2. Affected versionversion=10.1(2)
  3. Affected versionversion=10.1(2t)
  4. Affected versionversion=10.2(1)
  5. Affected versionversion=10.2(1q)
  6. Affected versionversion=10.2(2)
  7. Affected versionversion=10.2(3)
  8. Affected versionversion=10.2(3t)
  9. Affected versionversion=10.2(3v)
  10. Affected versionversion=10.2(4)
  11. Affected versionversion=10.2(5)
  12. Affected versionversion=10.2(6)
  13. Affected versionversion=10.3(1)
  14. Affected versionversion=10.3(2)
  15. Affected versionversion=10.3(3)
  16. Affected versionversion=10.3(99w)
  17. Affected versionversion=10.3(99x)
  18. Affected versionversion=10.4(1)
  19. Affected versionversion=6.0(2)A3(1)
  20. Affected versionversion=6.0(2)A3(2)
  21. Affected versionversion=6.0(2)A3(4)
  22. Affected versionversion=6.0(2)A4(1)
  23. Affected versionversion=6.0(2)A4(2)
  24. Affected versionversion=6.0(2)A4(3)
  25. Affected versionversion=6.0(2)A4(4)
  26. Affected versionversion=6.0(2)A4(5)
  27. Affected versionversion=6.0(2)A4(6)
  28. Affected versionversion=6.0(2)A6(1)
  29. Affected versionversion=6.0(2)A6(1a)
  30. Affected versionversion=6.0(2)A6(2)
  31. Affected versionversion=6.0(2)A6(2a)
  32. Affected versionversion=6.0(2)A6(3)
  33. Affected versionversion=6.0(2)A6(3a)
  34. Affected versionversion=6.0(2)A6(4)
  35. Affected versionversion=6.0(2)A6(4a)
  36. Affected versionversion=6.0(2)A6(5)
  37. Affected versionversion=6.0(2)A6(5a)
  38. Affected versionversion=6.0(2)A6(5b)
  39. Affected versionversion=6.0(2)A6(6)
  40. Affected versionversion=6.0(2)A6(7)
  41. Affected versionversion=6.0(2)A6(8)
  42. Affected versionversion=6.0(2)A7(1)
  43. Affected versionversion=6.0(2)A7(1a)
  44. Affected versionversion=6.0(2)A7(2)
  45. Affected versionversion=6.0(2)A7(2a)
  46. Affected versionversion=6.0(2)A8(1)
  47. Affected versionversion=6.0(2)A8(10)
  48. Affected versionversion=6.0(2)A8(10a)
  49. Affected versionversion=6.0(2)A8(11)
  50. Affected versionversion=6.0(2)A8(11a)
  51. Affected versionversion=6.0(2)A8(11b)
  52. Affected versionversion=6.0(2)A8(2)
  53. Affected versionversion=6.0(2)A8(3)
  54. Affected versionversion=6.0(2)A8(4)
  55. Affected versionversion=6.0(2)A8(4a)
  56. Affected versionversion=6.0(2)A8(5)
  57. Affected versionversion=6.0(2)A8(6)
  58. Affected versionversion=6.0(2)A8(7)
  59. Affected versionversion=6.0(2)A8(7a)
  60. Affected versionversion=6.0(2)A8(7b)
  61. Affected versionversion=6.0(2)A8(8)
  62. Affected versionversion=6.0(2)A8(9)
  63. Affected versionversion=6.0(2)U2(1)
  64. Affected versionversion=6.0(2)U2(2)
  65. Affected versionversion=6.0(2)U2(3)
  66. Affected versionversion=6.0(2)U2(4)
  67. Affected versionversion=6.0(2)U2(5)
  68. Affected versionversion=6.0(2)U2(6)
  69. Affected versionversion=6.0(2)U3(1)
  70. Affected versionversion=6.0(2)U3(2)
  71. Affected versionversion=6.0(2)U3(3)
  72. Affected versionversion=6.0(2)U3(4)
  73. Affected versionversion=6.0(2)U3(5)
  74. Affected versionversion=6.0(2)U3(6)
  75. Affected versionversion=6.0(2)U3(7)
  76. Affected versionversion=6.0(2)U3(8)
  77. Affected versionversion=6.0(2)U3(9)
  78. Affected versionversion=6.0(2)U4(1)
  79. Affected versionversion=6.0(2)U4(2)
  80. Affected versionversion=6.0(2)U4(3)
  81. Affected versionversion=6.0(2)U4(4)
  82. Affected versionversion=6.0(2)U5(1)
  83. Affected versionversion=6.0(2)U5(2)
  84. Affected versionversion=6.0(2)U5(3)
  85. Affected versionversion=6.0(2)U5(4)
  86. Affected versionversion=6.0(2)U6(1)
  87. Affected versionversion=6.0(2)U6(10)
  88. Affected versionversion=6.0(2)U6(1a)
  89. Affected versionversion=6.0(2)U6(2)
  90. Affected versionversion=6.0(2)U6(2a)
  91. Affected versionversion=6.0(2)U6(3)
  92. Affected versionversion=6.0(2)U6(3a)
  93. Affected versionversion=6.0(2)U6(4)
  94. Affected versionversion=6.0(2)U6(4a)
  95. Affected versionversion=6.0(2)U6(5)
  96. Affected versionversion=6.0(2)U6(5a)
  97. Affected versionversion=6.0(2)U6(5b)
  98. Affected versionversion=6.0(2)U6(5c)
  99. Affected versionversion=6.0(2)U6(6)
  100. Affected versionversion=6.0(2)U6(7)
  101. Affected versionversion=6.0(2)U6(8)
  102. Affected versionversion=6.0(2)U6(9)
  103. Affected versionversion=6.2(10)
  104. Affected versionversion=6.2(12)
  105. Affected versionversion=6.2(14)
  106. Affected versionversion=6.2(16)
  107. Affected versionversion=6.2(18)
  108. Affected versionversion=6.2(2)
  109. Affected versionversion=6.2(20)
  110. Affected versionversion=6.2(20a)
  111. Affected versionversion=6.2(22)
  112. Affected versionversion=6.2(24)
  113. Affected versionversion=6.2(24a)
  114. Affected versionversion=6.2(2a)
  115. Affected versionversion=6.2(6)
  116. Affected versionversion=6.2(6a)
  117. Affected versionversion=6.2(6b)
  118. Affected versionversion=6.2(8)
  119. Affected versionversion=6.2(8a)
  120. Affected versionversion=6.2(8b)
  121. Affected versionversion=7.0(3)F1(1)
  122. Affected versionversion=7.0(3)F2(1)
  123. Affected versionversion=7.0(3)F2(2)
  124. Affected versionversion=7.0(3)F3(1)
  125. Affected versionversion=7.0(3)F3(2)
  126. Affected versionversion=7.0(3)F3(3)
  127. Affected versionversion=7.0(3)F3(3a)
  128. Affected versionversion=7.0(3)F3(3c)
  129. Affected versionversion=7.0(3)F3(4)
  130. Affected versionversion=7.0(3)F3(5)
  131. Affected versionversion=7.0(3)I2(1)
  132. Affected versionversion=7.0(3)I2(1a)
  133. Affected versionversion=7.0(3)I2(2)
  134. Affected versionversion=7.0(3)I2(2a)
  135. Affected versionversion=7.0(3)I2(2b)
  136. Affected versionversion=7.0(3)I2(2c)
  137. Affected versionversion=7.0(3)I2(2d)
  138. Affected versionversion=7.0(3)I2(2e)
  139. Affected versionversion=7.0(3)I2(3)
  140. Affected versionversion=7.0(3)I2(4)
  141. Affected versionversion=7.0(3)I2(5)
  142. Affected versionversion=7.0(3)I3(1)
  143. Affected versionversion=7.0(3)I4(1)
  144. Affected versionversion=7.0(3)I4(2)
  145. Affected versionversion=7.0(3)I4(3)
  146. Affected versionversion=7.0(3)I4(4)
  147. Affected versionversion=7.0(3)I4(5)
  148. Affected versionversion=7.0(3)I4(6)
  149. Affected versionversion=7.0(3)I4(7)
  150. Affected versionversion=7.0(3)I4(8)
  151. Affected versionversion=7.0(3)I4(8a)
  152. Affected versionversion=7.0(3)I4(8b)
  153. Affected versionversion=7.0(3)I4(8z)
  154. Affected versionversion=7.0(3)I4(9)
  155. Affected versionversion=7.0(3)I5(1)
  156. Affected versionversion=7.0(3)I5(2)
  157. Affected versionversion=7.0(3)I6(1)
  158. Affected versionversion=7.0(3)I6(2)
  159. Affected versionversion=7.0(3)I7(1)
  160. Affected versionversion=7.0(3)I7(10)
  161. Affected versionversion=7.0(3)I7(2)
  162. Affected versionversion=7.0(3)I7(3)
  163. Affected versionversion=7.0(3)I7(4)
  164. Affected versionversion=7.0(3)I7(5)
  165. Affected versionversion=7.0(3)I7(5a)
  166. Affected versionversion=7.0(3)I7(6)
  167. Affected versionversion=7.0(3)I7(7)
  168. Affected versionversion=7.0(3)I7(8)
  169. Affected versionversion=7.0(3)I7(9)
  170. Affected versionversion=7.1(0)N1(1)
  171. Affected versionversion=7.1(0)N1(1a)
  172. Affected versionversion=7.1(0)N1(1b)
  173. Affected versionversion=7.1(1)N1(1)
  174. Affected versionversion=7.1(2)N1(1)
  175. Affected versionversion=7.1(3)N1(1)
  176. Affected versionversion=7.1(3)N1(2)
  177. Affected versionversion=7.1(4)N1(1)
  178. Affected versionversion=7.1(5)N1(1)
  179. Affected versionversion=7.1(5)N1(1b)
  180. Affected versionversion=7.2(0)D1(1)
  181. Affected versionversion=7.2(1)D1(1)
  182. Affected versionversion=7.2(2)D1(1)
  183. Affected versionversion=7.2(2)D1(2)
  184. Affected versionversion=7.3(0)D1(1)
  185. Affected versionversion=7.3(0)DX(1)
  186. Affected versionversion=7.3(0)N1(1)
  187. Affected versionversion=9.2(1)
  188. Affected versionversion=9.2(2)
  189. Affected versionversion=9.2(2t)
  190. Affected versionversion=9.2(2v)
  191. Affected versionversion=9.2(3)
  192. Affected versionversion=9.2(4)
  193. Affected versionversion=9.3(1)
  194. Affected versionversion=9.3(10)
  195. Affected versionversion=9.3(11)
  196. Affected versionversion=9.3(12)
  197. Affected versionversion=9.3(2)
  198. Affected versionversion=9.3(3)
  199. Affected versionversion=9.3(4)
  200. Affected versionversion=9.3(5)
  201. Affected versionversion=9.3(6)
  202. Affected versionversion=9.3(7)
  203. Affected versionversion=9.3(7a)
  204. Affected versionversion=9.3(8)
  205. Affected versionversion=9.3(9)

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco NX-OS Softwareversion=10.1(1); version=10.1(2); version=10.1(2t); version=10.2(1); version=10.2(1q); version=10.2(2); version=10.2(3); version=10.2(3t); version=10.2(3v); version=10.2(4); version=10.2(5); version=10.2(6); version=10.3(1); version=10.3(2); version=10.3(3); version=10.3(99w); version=10.3(99x); version=10.4(1); version=6.0(2)A3(1); version=6.0(2)A3(2); version=6.0(2)A3(4); version=6.0(2)A4(1); version=6.0(2)A4(2); version=6.0(2)A4(3); version=6.0(2)A4(4); version=6.0(2)A4(5); version=6.0(2)A4(6); version=6.0(2)A6(1); version=6.0(2)A6(1a); version=6.0(2)A6(2); version=6.0(2)A6(2a); version=6.0(2)A6(3); version=6.0(2)A6(3a); version=6.0(2)A6(4); version=6.0(2)A6(4a); version=6.0(2)A6(5); version=6.0(2)A6(5a); version=6.0(2)A6(5b); version=6.0(2)A6(6); version=6.0(2)A6(7); version=6.0(2)A6(8); version=6.0(2)A7(1); version=6.0(2)A7(1a); version=6.0(2)A7(2); version=6.0(2)A7(2a); version=6.0(2)A8(1); version=6.0(2)A8(10); version=6.0(2)A8(10a); version=6.0(2)A8(11); version=6.0(2)A8(11a); version=6.0(2)A8(11b); version=6.0(2)A8(2); version=6.0(2)A8(3); version=6.0(2)A8(4); version=6.0(2)A8(4a); version=6.0(2)A8(5); version=6.0(2)A8(6); version=6.0(2)A8(7); version=6.0(2)A8(7a); version=6.0(2)A8(7b); version=6.0(2)A8(8); version=6.0(2)A8(9); version=6.0(2)U2(1); version=6.0(2)U2(2); version=6.0(2)U2(3); version=6.0(2)U2(4); version=6.0(2)U2(5); version=6.0(2)U2(6); version=6.0(2)U3(1); version=6.0(2)U3(2); version=6.0(2)U3(3); version=6.0(2)U3(4); version=6.0(2)U3(5); version=6.0(2)U3(6); version=6.0(2)U3(7); version=6.0(2)U3(8); version=6.0(2)U3(9); version=6.0(2)U4(1); version=6.0(2)U4(2); version=6.0(2)U4(3); version=6.0(2)U4(4); version=6.0(2)U5(1); version=6.0(2)U5(2); version=6.0(2)U5(3); version=6.0(2)U5(4); version=6.0(2)U6(1); version=6.0(2)U6(10); version=6.0(2)U6(1a); version=6.0(2)U6(2); version=6.0(2)U6(2a); version=6.0(2)U6(3); version=6.0(2)U6(3a); version=6.0(2)U6(4); version=6.0(2)U6(4a); version=6.0(2)U6(5); version=6.0(2)U6(5a); version=6.0(2)U6(5b); version=6.0(2)U6(5c); version=6.0(2)U6(6); version=6.0(2)U6(7); version=6.0(2)U6(8); version=6.0(2)U6(9); version=6.2(10); version=6.2(12); version=6.2(14); version=6.2(16); version=6.2(18); version=6.2(2); version=6.2(20); version=6.2(20a); version=6.2(22); version=6.2(24); version=6.2(24a); version=6.2(2a); version=6.2(6); version=6.2(6a); version=6.2(6b); version=6.2(8); version=6.2(8a); version=6.2(8b); version=7.0(3)F1(1); version=7.0(3)F2(1); version=7.0(3)F2(2); version=7.0(3)F3(1); version=7.0(3)F3(2); version=7.0(3)F3(3); version=7.0(3)F3(3a); version=7.0(3)F3(3c); version=7.0(3)F3(4); version=7.0(3)F3(5); version=7.0(3)I2(1); version=7.0(3)I2(1a); version=7.0(3)I2(2); version=7.0(3)I2(2a); version=7.0(3)I2(2b); version=7.0(3)I2(2c); version=7.0(3)I2(2d); version=7.0(3)I2(2e); version=7.0(3)I2(3); version=7.0(3)I2(4); version=7.0(3)I2(5); version=7.0(3)I3(1); version=7.0(3)I4(1); version=7.0(3)I4(2); version=7.0(3)I4(3); version=7.0(3)I4(4); version=7.0(3)I4(5); version=7.0(3)I4(6); version=7.0(3)I4(7); version=7.0(3)I4(8); version=7.0(3)I4(8a); version=7.0(3)I4(8b); version=7.0(3)I4(8z); version=7.0(3)I4(9); version=7.0(3)I5(1); version=7.0(3)I5(2); version=7.0(3)I6(1); version=7.0(3)I6(2); version=7.0(3)I7(1); version=7.0(3)I7(10); version=7.0(3)I7(2); version=7.0(3)I7(3); version=7.0(3)I7(4); version=7.0(3)I7(5); version=7.0(3)I7(5a); version=7.0(3)I7(6); version=7.0(3)I7(7); version=7.0(3)I7(8); version=7.0(3)I7(9); version=7.1(0)N1(1); version=7.1(0)N1(1a); version=7.1(0)N1(1b); version=7.1(1)N1(1); version=7.1(2)N1(1); version=7.1(3)N1(1); version=7.1(3)N1(2); version=7.1(4)N1(1); version=7.1(5)N1(1); version=7.1(5)N1(1b); version=7.2(0)D1(1); version=7.2(1)D1(1); version=7.2(2)D1(1); version=7.2(2)D1(2); version=7.3(0)D1(1); version=7.3(0)DX(1); version=7.3(0)N1(1); version=9.2(1); version=9.2(2); version=9.2(2t); version=9.2(2v); version=9.2(3); version=9.2(4); version=9.3(1); version=9.3(10); version=9.3(11); version=9.3(12); version=9.3(2); version=9.3(3); version=9.3(4); version=9.3(5); version=9.3(6); version=9.3(7); version=9.3(7a); version=9.3(8); version=9.3(9)

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
8.6NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Application 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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