CVE-2024-20307Network attack vector

Device reload via fragmented IKEv1 packet reassembly

Published Mar 27, 2024 · Updated Aug 1, 2024

Heap overflow in Cisco IOS and IOS XE Software allows remote attackers to reload affected devices through crafted IKEv1 UDP packets. The IKEv1 fragmentation code improperly reassembles attacker-controlled fragments, causing the heap overflow. Exploitation requires traffic directed to the device, IKEv1 fragmentation and an IKEv1 VPN enabled, and a huge-buffer size above 32,767.

CVSS severity6.8
Medium
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in Cisco IOS and IOS XE Software allows remote attackers to reload affected devices through crafted IKEv1 UDP packets. The IKEv1 fragmentation code improperly reassembles attacker-controlled fragments, causing the heap overflow. Exploitation requires traffic directed to the device, IKEv1 fragmentation and an IKEv1 VPN enabled, and a huge-buffer size above 32,767.

The record

CVE
CVE-2024-20307
Published
Mar 27, 2024
Updated
Aug 1, 2024
Vendor
ClamAV
Product
Cisco IOS
Classifications
CWE-121, T1499.004
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=15.1(2)SG8
  2. Affected versionversion=15.1(2)SY10
  3. Affected versionversion=15.1(2)SY11
  4. Affected versionversion=15.1(2)SY12
  5. Affected versionversion=15.1(2)SY13
  6. Affected versionversion=15.1(2)SY14
  7. Affected versionversion=15.1(2)SY15
  8. Affected versionversion=15.1(2)SY16
  9. Affected versionversion=15.1(2)SY8
  10. Affected versionversion=15.1(2)SY9
  11. Affected versionversion=15.2(1)SY3
  12. Affected versionversion=15.2(1)SY4
  13. Affected versionversion=15.2(1)SY5
  14. Affected versionversion=15.2(1)SY6
  15. Affected versionversion=15.2(1)SY7
  16. Affected versionversion=15.2(1)SY8
  17. Affected versionversion=15.2(3)E4
  18. Affected versionversion=15.2(3)E5
  19. Affected versionversion=15.2(4)E10
  20. Affected versionversion=15.2(4)E10a
  21. Affected versionversion=15.2(4)E10d
  22. Affected versionversion=15.2(4)E2
  23. Affected versionversion=15.2(4)E3
  24. Affected versionversion=15.2(4)E4
  25. Affected versionversion=15.2(4)E5
  26. Affected versionversion=15.2(4)E5a
  27. Affected versionversion=15.2(4)E6
  28. Affected versionversion=15.2(4)E7
  29. Affected versionversion=15.2(4)E8
  30. Affected versionversion=15.2(4)E9
  31. Affected versionversion=15.2(4)EA4
  32. Affected versionversion=15.2(4)EA5
  33. Affected versionversion=15.2(4)EA6
  34. Affected versionversion=15.2(4)EA7
  35. Affected versionversion=15.2(4)EA8
  36. Affected versionversion=15.2(4)EA9
  37. Affected versionversion=15.2(4)EA9a
  38. Affected versionversion=15.2(4)EC1
  39. Affected versionversion=15.2(4)EC2
  40. Affected versionversion=15.2(4)M11
  41. Affected versionversion=15.2(5b)E
  42. Affected versionversion=15.2(5)E
  43. Affected versionversion=15.2(5)EA
  44. Affected versionversion=15.3(1)SY1
  45. Affected versionversion=15.3(1)SY2
  46. Affected versionversion=15.3(3)JPI11
  47. Affected versionversion=15.3(3)M10
  48. Affected versionversion=15.3(3)M8
  49. Affected versionversion=15.3(3)M8a
  50. Affected versionversion=15.3(3)M9
  51. Affected versionversion=15.3(3)S10
  52. Affected versionversion=15.3(3)S8
  53. Affected versionversion=15.3(3)S8a
  54. Affected versionversion=15.3(3)S9
  55. Affected versionversion=15.4(1)SY
  56. Affected versionversion=15.4(1)SY1
  57. Affected versionversion=15.4(1)SY2
  58. Affected versionversion=15.4(1)SY3
  59. Affected versionversion=15.4(1)SY4
  60. Affected versionversion=15.4(3)S10
  61. Affected versionversion=15.4(3)S6
  62. Affected versionversion=15.4(3)S6a
  63. Affected versionversion=15.4(3)S7
  64. Affected versionversion=15.4(3)S8
  65. Affected versionversion=15.4(3)S9
  66. Affected versionversion=15.5(1)S4
  67. Affected versionversion=15.5(1)SY
  68. Affected versionversion=15.5(1)SY1
  69. Affected versionversion=15.5(1)SY10
  70. Affected versionversion=15.5(1)SY11
  71. Affected versionversion=15.5(1)SY2
  72. Affected versionversion=15.5(1)SY3
  73. Affected versionversion=15.5(1)SY4
  74. Affected versionversion=15.5(1)SY5
  75. Affected versionversion=15.5(1)SY6
  76. Affected versionversion=15.5(1)SY7
  77. Affected versionversion=15.5(1)SY8
  78. Affected versionversion=15.5(1)SY9
  79. Affected versionversion=15.5(2)S4
  80. Affected versionversion=15.5(2)T4
  81. Affected versionversion=15.5(3)M10
  82. Affected versionversion=15.5(3)M3
  83. Affected versionversion=15.5(3)M4
  84. Affected versionversion=15.5(3)M4a
  85. Affected versionversion=15.5(3)M5
  86. Affected versionversion=15.5(3)M6
  87. Affected versionversion=15.5(3)M6a
  88. Affected versionversion=15.5(3)M7
  89. Affected versionversion=15.5(3)M8
  90. Affected versionversion=15.5(3)M9
  91. Affected versionversion=15.5(3)S10
  92. Affected versionversion=15.5(3)S3
  93. Affected versionversion=15.5(3)S4
  94. Affected versionversion=15.5(3)S5
  95. Affected versionversion=15.5(3)S6
  96. Affected versionversion=15.5(3)S6a
  97. Affected versionversion=15.5(3)S6b
  98. Affected versionversion=15.5(3)S7
  99. Affected versionversion=15.5(3)S8
  100. Affected versionversion=15.5(3)S9
  101. Affected versionversion=15.5(3)S9a
  102. Affected versionversion=15.7(3)M
  103. Affected versionversion=15.7(3)M0a
  104. Affected versionversion=15.7(3)M1
  105. Affected versionversion=15.7(3)M2
  106. Affected versionversion=15.7(3)M3
  107. Affected versionversion=15.7(3)M4
  108. Affected versionversion=15.7(3)M4a
  109. Affected versionversion=15.7(3)M4b
  110. Affected versionversion=15.7(3)M5
  111. Affected versionversion=15.7(3)M6
  112. Affected versionversion=15.7(3)M7
  113. Affected versionversion=15.7(3)M8
  114. Affected versionversion=15.7(3)M9
  115. Affected versionversion=15.8(3)M
  116. Affected versionversion=15.8(3)M0a
  117. Affected versionversion=15.8(3)M0b
  118. Affected versionversion=15.8(3)M1
  119. Affected versionversion=15.8(3)M10
  120. Affected versionversion=15.8(3)M1a
  121. Affected versionversion=15.8(3)M2
  122. Affected versionversion=15.8(3)M2a
  123. Affected versionversion=15.8(3)M3
  124. Affected versionversion=15.8(3)M3a
  125. Affected versionversion=15.8(3)M3b
  126. Affected versionversion=15.8(3)M4
  127. Affected versionversion=15.8(3)M5
  128. Affected versionversion=15.8(3)M6
  129. Affected versionversion=15.8(3)M7
  130. Affected versionversion=15.8(3)M8
  131. Affected versionversion=15.8(3)M9
  132. Affected versionversion=15.9(3)M
  133. Affected versionversion=15.9(3)M0a
  134. Affected versionversion=15.9(3)M1
  135. Affected versionversion=15.9(3)M2
  136. Affected versionversion=15.9(3)M2a
  137. Affected versionversion=15.9(3)M3
  138. Affected versionversion=15.9(3)M3a
  139. Affected versionversion=15.9(3)M3b
  140. Affected versionversion=15.9(3)M4
  141. Affected versionversion=15.9(3)M4a
  142. Affected versionversion=15.9(3)M5
  143. Affected versionversion=15.9(3)M6
  144. Affected versionversion=15.9(3)M6a
  145. Affected versionversion=15.9(3)M6b
  146. Affected versionversion=15.9(3)M7
  147. Affected versionversion=15.9(3)M7a

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOSversion=15.1(2)SG8; version=15.1(2)SY10; version=15.1(2)SY11; version=15.1(2)SY12; version=15.1(2)SY13; version=15.1(2)SY14; version=15.1(2)SY15; version=15.1(2)SY16; version=15.1(2)SY8; version=15.1(2)SY9; version=15.2(1)SY3; version=15.2(1)SY4; version=15.2(1)SY5; version=15.2(1)SY6; version=15.2(1)SY7; version=15.2(1)SY8; version=15.2(3)E4; version=15.2(3)E5; version=15.2(4)E10; version=15.2(4)E10a; version=15.2(4)E10d; version=15.2(4)E2; version=15.2(4)E3; version=15.2(4)E4; version=15.2(4)E5; version=15.2(4)E5a; version=15.2(4)E6; version=15.2(4)E7; version=15.2(4)E8; version=15.2(4)E9; version=15.2(4)EA4; version=15.2(4)EA5; version=15.2(4)EA6; version=15.2(4)EA7; version=15.2(4)EA8; version=15.2(4)EA9; version=15.2(4)EA9a; version=15.2(4)EC1; version=15.2(4)EC2; version=15.2(4)M11; version=15.2(5b)E; version=15.2(5)E; version=15.2(5)EA; version=15.3(1)SY1; version=15.3(1)SY2; version=15.3(3)JPI11; version=15.3(3)M10; version=15.3(3)M8; version=15.3(3)M8a; version=15.3(3)M9; version=15.3(3)S10; version=15.3(3)S8; version=15.3(3)S8a; version=15.3(3)S9; version=15.4(1)SY; version=15.4(1)SY1; version=15.4(1)SY2; version=15.4(1)SY3; version=15.4(1)SY4; version=15.4(3)S10; version=15.4(3)S6; version=15.4(3)S6a; version=15.4(3)S7; version=15.4(3)S8; version=15.4(3)S9; version=15.5(1)S4; version=15.5(1)SY; version=15.5(1)SY1; version=15.5(1)SY10; version=15.5(1)SY11; version=15.5(1)SY2; version=15.5(1)SY3; version=15.5(1)SY4; version=15.5(1)SY5; version=15.5(1)SY6; version=15.5(1)SY7; version=15.5(1)SY8; version=15.5(1)SY9; version=15.5(2)S4; version=15.5(2)T4; version=15.5(3)M10; version=15.5(3)M3; version=15.5(3)M4; version=15.5(3)M4a; version=15.5(3)M5; version=15.5(3)M6; version=15.5(3)M6a; version=15.5(3)M7; version=15.5(3)M8; version=15.5(3)M9; version=15.5(3)S10; version=15.5(3)S3; version=15.5(3)S4; version=15.5(3)S5; version=15.5(3)S6; version=15.5(3)S6a; version=15.5(3)S6b; version=15.5(3)S7; version=15.5(3)S8; version=15.5(3)S9; version=15.5(3)S9a; version=15.7(3)M; version=15.7(3)M0a; version=15.7(3)M1; version=15.7(3)M2; version=15.7(3)M3; version=15.7(3)M4; version=15.7(3)M4a; version=15.7(3)M4b; version=15.7(3)M5; version=15.7(3)M6; version=15.7(3)M7; version=15.7(3)M8; version=15.7(3)M9; version=15.8(3)M; version=15.8(3)M0a; version=15.8(3)M0b; version=15.8(3)M1; version=15.8(3)M10; version=15.8(3)M1a; version=15.8(3)M2; version=15.8(3)M2a; version=15.8(3)M3; version=15.8(3)M3a; version=15.8(3)M3b; version=15.8(3)M4; version=15.8(3)M5; version=15.8(3)M6; version=15.8(3)M7; version=15.8(3)M8; version=15.8(3)M9; version=15.9(3)M; version=15.9(3)M0a; version=15.9(3)M1; version=15.9(3)M2; version=15.9(3)M2a; version=15.9(3)M3; version=15.9(3)M3a; version=15.9(3)M3b; version=15.9(3)M4; version=15.9(3)M4a; version=15.9(3)M5; version=15.9(3)M6; version=15.9(3)M6a; version=15.9(3)M6b; version=15.9(3)M7; version=15.9(3)M7a
ClamAV · Cisco IOS XE Softwareversion=16.10.1; version=16.10.1a; version=16.10.1b; version=16.10.1c; version=16.10.1d; version=16.10.1e; version=16.10.1f; version=16.10.1g; 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=16.12.1a; version=16.12.1c; version=16.12.1s; version=16.12.1t; version=16.12.1w; version=16.12.1x; version=16.12.1y; version=16.12.1z1; version=16.12.1z2; 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=16.1.3; version=16.2.1; version=16.2.2; 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=16.7.1a; version=16.7.1b; version=16.7.2; version=16.7.3; version=16.7.4; version=16.8.1; version=16.8.1a; version=16.8.1b; version=16.8.1c; version=16.8.1d; version=16.8.1e; 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=17.1.3; 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=17.3.1w; version=17.3.1x; version=17.3.1z; 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=17.4.1; 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=17.6.1w; version=17.6.1x; version=17.6.1y; version=17.6.1z; version=17.6.1z1; 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=17.7.1; 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=17.9.1w; version=17.9.1x; version=17.9.1x1; version=17.9.1y; version=17.9.2; version=17.9.2a; version=17.9.3; version=17.9.3a; version=3.10.10S; version=3.10.8aS; version=3.10.8S; version=3.10.9S; version=3.13.10S; version=3.13.6aS; version=3.13.6S; version=3.13.7aS; version=3.13.7S; version=3.13.8S; version=3.13.9S; version=3.14.4S; version=3.15.4S; version=3.16.10S; version=3.16.3aS; version=3.16.3S; version=3.16.4aS; version=3.16.4bS; version=3.16.4dS; version=3.16.4S; version=3.16.5S; version=3.16.6bS; version=3.16.6S; version=3.16.7aS; version=3.16.7bS; version=3.16.7S; version=3.16.8S; version=3.16.9S; version=3.4.8SG; version=3.7.4E; version=3.7.5E; version=3.8.10E; version=3.8.2E; version=3.8.3E; version=3.8.4E; version=3.8.5aE; version=3.8.5E; version=3.8.6E; version=3.8.7E; version=3.8.8E; version=3.8.9E; version=3.9.0E

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:H/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-121Stack-based Buffer Overflow
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

See the directory against your own environment.

Your stack

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