CVE-2024-20339Network attack vector

Device reload via NULL pointer dereference

Published Oct 23, 2024 · Updated Oct 24, 2024

NULL pointer dereference in Cisco Firepower Threat Defense allows remote attackers to reload Firepower 2100 devices via IPv4 TLS traffic. The TLS-processing path dereferences a NULL pointer while handling certain IPv4 TLS traffic. Exposure requires a vulnerable release on a Firepower 2100 Series firewall with a configured decryption policy, and exploitation interrupts traffic to and through the device.

CVSS severity8.6
High
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Cisco Firepower Threat Defense allows remote attackers to reload Firepower 2100 devices via IPv4 TLS traffic. The TLS-processing path dereferences a NULL pointer while handling certain IPv4 TLS traffic. Exposure requires a vulnerable release on a Firepower 2100 Series firewall with a configured decryption policy, and exploitation interrupts traffic to and through the device.

The record

CVE
CVE-2024-20339
Published
Oct 23, 2024
Updated
Oct 24, 2024
Vendor
ClamAV
Product
Cisco Firepower Threat Defense
Classifications
CWE-476, T1498
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 23, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2.3
  2. Affected versionversion=6.2.3.1
  3. Affected versionversion=6.2.3.10
  4. Affected versionversion=6.2.3.11
  5. Affected versionversion=6.2.3.12
  6. Affected versionversion=6.2.3.13
  7. Affected versionversion=6.2.3.14
  8. Affected versionversion=6.2.3.15
  9. Affected versionversion=6.2.3.16
  10. Affected versionversion=6.2.3.17
  11. Affected versionversion=6.2.3.18
  12. Affected versionversion=6.2.3.2
  13. Affected versionversion=6.2.3.3
  14. Affected versionversion=6.2.3.4
  15. Affected versionversion=6.2.3.5
  16. Affected versionversion=6.2.3.6
  17. Affected versionversion=6.2.3 <=6.2.3.18
  18. Affected versionversion=6.2.3.7
  19. Affected versionversion=6.2.3.8
  20. Affected versionversion=6.2.3.9
  21. Affected versionversion=6.4.0
  22. Affected versionversion=6.4.0.1
  23. Affected versionversion=6.4.0.10
  24. Affected versionversion=6.4.0.11
  25. Affected versionversion=6.4.0.12
  26. Affected versionversion=6.4.0.13
  27. Affected versionversion=6.4.0.14
  28. Affected versionversion=6.4.0.15
  29. Affected versionversion=6.4.0.16
  30. Affected versionversion=6.4.0.17
  31. Affected versionversion=6.4.0.2
  32. Affected versionversion=6.4.0.3
  33. Affected versionversion=6.4.0.4
  34. Affected versionversion=6.4.0.5
  35. Affected versionversion=6.4.0.6
  36. Affected versionversion=6.4.0 <=6.4.0.17
  37. Affected versionversion=6.4.0.7
  38. Affected versionversion=6.4.0.8
  39. Affected versionversion=6.4.0.9
  40. Affected versionversion=6.6.0
  41. Affected versionversion=6.6.0.1
  42. Affected versionversion=6.6.0 <=6.6.7.2
  43. Affected versionversion=6.6.1
  44. Affected versionversion=6.6.3
  45. Affected versionversion=6.6.4
  46. Affected versionversion=6.6.5
  47. Affected versionversion=6.6.5.1
  48. Affected versionversion=6.6.5.2
  49. Affected versionversion=6.6.7
  50. Affected versionversion=6.6.7.1
  51. Affected versionversion=6.6.7.2
  52. Affected versionversion=6.7.0
  53. Affected versionversion=6.7.0.1
  54. Affected versionversion=6.7.0.2
  55. Affected versionversion=6.7.0.3
  56. Affected versionversion=6.7.0 <=6.7.0.3
  57. Affected versionversion=7.0.0
  58. Affected versionversion=7.0.0.1
  59. Affected versionversion=7.0.0 <=7.0.6.1
  60. Affected versionversion=7.0.1
  61. Affected versionversion=7.0.1.1
  62. Affected versionversion=7.0.2
  63. Affected versionversion=7.0.2.1
  64. Affected versionversion=7.0.3
  65. Affected versionversion=7.0.4
  66. Affected versionversion=7.0.5
  67. Affected versionversion=7.0.6
  68. Affected versionversion=7.0.6.1
  69. Affected versionversion=7.1.0
  70. Affected versionversion=7.1.0.1
  71. Affected versionversion=7.1.0.3
  72. Affected versionversion=7.1.0 <=7.1.0.3
  73. Affected versionversion=7.2.0
  74. Affected versionversion=7.2.0.1
  75. Affected versionversion=7.2.0 <=7.2.5.2
  76. Affected versionversion=7.2.1
  77. Affected versionversion=7.2.2
  78. Affected versionversion=7.2.3
  79. Affected versionversion=7.2.4
  80. Affected versionversion=7.2.4.1
  81. Affected versionversion=7.2.5
  82. Affected versionversion=7.2.5.1
  83. Affected versionversion=7.2.5.2
  84. Affected versionversion=7.3.0
  85. Affected versionversion=7.3.0 <=7.3.1.2
  86. Affected versionversion=7.3.1
  87. Affected versionversion=7.3.1.1
  88. Affected versionversion=7.3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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 <=6.2.3.18; 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=6.4.0.17; 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 <=6.4.0.17; 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=6.6.0 <=6.6.7.2; 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=6.6.7.2; version=6.7.0; version=6.7.0.1; version=6.7.0.2; version=6.7.0.3; version=6.7.0 <=6.7.0.3; version=7.0.0; version=7.0.0.1; version=7.0.0 <=7.0.6.1; 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=7.0.6; version=7.0.6.1; version=7.1.0; version=7.1.0.1; version=7.1.0.3; version=7.1.0 <=7.1.0.3; version=7.2.0; version=7.2.0.1; version=7.2.0 <=7.2.5.2; version=7.2.1; version=7.2.2; version=7.2.3; version=7.2.4; version=7.2.4.1; version=7.2.5; version=7.2.5.1; version=7.2.5.2; version=7.3.0; version=7.3.0 <=7.3.1.2; version=7.3.1; version=7.3.1.1; version=7.3.1.2

Published CVSS scores

8.6CiscoCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-476NULL Pointer Dereference
T1498Network Denial of Service

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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