CVE-2024-8096Network attack vector

TLS certificate validation bypass via accepted OCSP errors

Published Sep 11, 2024 · Updated Nov 14, 2024

Improper certificate validation in curl 7.41.0 through 8.9.1 allows remote attackers to bypass OCSP stapling checks with error responses. Curl_gtls_verifyserver in lib/vtls/gtls.c treats only a revoked certificate status as failure, so other OCSP error statuses pass validation. Reachability requires a GnuTLS build and an explicitly requested certificate-status check; the bypass permits acceptance of a certificate whose stapled status is not good.

CVSS severity6.5
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

Improper certificate validation in curl 7.41.0 through 8.9.1 allows remote attackers to bypass OCSP stapling checks with error responses. Curl_gtls_verifyserver in lib/vtls/gtls.c treats only a revoked certificate status as failure, so other OCSP error statuses pass validation. Reachability requires a GnuTLS build and an explicitly requested certificate-status check; the bypass permits acceptance of a certificate whose stapled status is not good.

The record

CVE
CVE-2024-8096
Published
Sep 11, 2024
Updated
Nov 14, 2024
Vendor
curl
Product
curl
Classifications
CWE-295
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 14, 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=7.41.0 <=7.41.0
  2. Affected versionversion=7.41.0 <=8.9.1
  3. Affected versionversion=7.42.0 <=7.42.0
  4. Affected versionversion=7.42.1 <=7.42.1
  5. Affected versionversion=7.43.0 <=7.43.0
  6. Affected versionversion=7.44.0 <=7.44.0
  7. Affected versionversion=7.45.0 <=7.45.0
  8. Affected versionversion=7.46.0 <=7.46.0
  9. Affected versionversion=7.47.0 <=7.47.0
  10. Affected versionversion=7.47.1 <=7.47.1
  11. Affected versionversion=7.48.0 <=7.48.0
  12. Affected versionversion=7.49.0 <=7.49.0
  13. Affected versionversion=7.49.1 <=7.49.1
  14. Affected versionversion=7.50.0 <=7.50.0
  15. Affected versionversion=7.50.1 <=7.50.1
  16. Affected versionversion=7.50.2 <=7.50.2
  17. Affected versionversion=7.50.3 <=7.50.3
  18. Affected versionversion=7.51.0 <=7.51.0
  19. Affected versionversion=7.52.0 <=7.52.0
  20. Affected versionversion=7.52.1 <=7.52.1
  21. Affected versionversion=7.53.0 <=7.53.0
  22. Affected versionversion=7.53.1 <=7.53.1
  23. Affected versionversion=7.54.0 <=7.54.0
  24. Affected versionversion=7.54.1 <=7.54.1
  25. Affected versionversion=7.55.0 <=7.55.0
  26. Affected versionversion=7.55.1 <=7.55.1
  27. Affected versionversion=7.56.0 <=7.56.0
  28. Affected versionversion=7.56.1 <=7.56.1
  29. Affected versionversion=7.57.0 <=7.57.0
  30. Affected versionversion=7.58.0 <=7.58.0
  31. Affected versionversion=7.59.0 <=7.59.0
  32. Affected versionversion=7.60.0 <=7.60.0
  33. Affected versionversion=7.61.0 <=7.61.0
  34. Affected versionversion=7.61.1 <=7.61.1
  35. Affected versionversion=7.62.0 <=7.62.0
  36. Affected versionversion=7.63.0 <=7.63.0
  37. Affected versionversion=7.64.0 <=7.64.0
  38. Affected versionversion=7.64.1 <=7.64.1
  39. Affected versionversion=7.65.0 <=7.65.0
  40. Affected versionversion=7.65.1 <=7.65.1
  41. Affected versionversion=7.65.2 <=7.65.2
  42. Affected versionversion=7.65.3 <=7.65.3
  43. Affected versionversion=7.66.0 <=7.66.0
  44. Affected versionversion=7.67.0 <=7.67.0
  45. Affected versionversion=7.68.0 <=7.68.0
  46. Affected versionversion=7.69.0 <=7.69.0
  47. Affected versionversion=7.69.1 <=7.69.1
  48. Affected versionversion=7.70.0 <=7.70.0
  49. Affected versionversion=7.71.0 <=7.71.0
  50. Affected versionversion=7.71.1 <=7.71.1
  51. Affected versionversion=7.72.0 <=7.72.0
  52. Affected versionversion=7.73.0 <=7.73.0
  53. Affected versionversion=7.74.0 <=7.74.0
  54. Affected versionversion=7.75.0 <=7.75.0
  55. Affected versionversion=7.76.0 <=7.76.0
  56. Affected versionversion=7.76.1 <=7.76.1
  57. Affected versionversion=7.77.0 <=7.77.0
  58. Affected versionversion=7.78.0 <=7.78.0
  59. Affected versionversion=7.79.0 <=7.79.0
  60. Affected versionversion=7.79.1 <=7.79.1
  61. Affected versionversion=7.80.0 <=7.80.0
  62. Affected versionversion=7.81.0 <=7.81.0
  63. Affected versionversion=7.82.0 <=7.82.0
  64. Affected versionversion=7.83.0 <=7.83.0
  65. Affected versionversion=7.83.1 <=7.83.1
  66. Affected versionversion=7.84.0 <=7.84.0
  67. Affected versionversion=7.85.0 <=7.85.0
  68. Affected versionversion=7.86.0 <=7.86.0
  69. Affected versionversion=7.87.0 <=7.87.0
  70. Affected versionversion=7.88.0 <=7.88.0
  71. Affected versionversion=7.88.1 <=7.88.1
  72. Affected versionversion=8.0.0 <=8.0.0
  73. Affected versionversion=8.0.1 <=8.0.1
  74. Affected versionversion=8.1.0 <=8.1.0
  75. Affected versionversion=8.1.1 <=8.1.1
  76. Affected versionversion=8.1.2 <=8.1.2
  77. Affected versionversion=8.2.0 <=8.2.0
  78. Affected versionversion=8.2.1 <=8.2.1
  79. Affected versionversion=8.3.0 <=8.3.0
  80. Affected versionversion=8.4.0 <=8.4.0
  81. Affected versionversion=8.5.0 <=8.5.0
  82. Affected versionversion=8.6.0 <=8.6.0
  83. Affected versionversion=8.7.0 <=8.7.0
  84. Affected versionversion=8.7.1 <=8.7.1
  85. Affected versionversion=8.8.0 <=8.8.0
  86. Affected versionversion=8.9.0 <=8.9.0
  87. Affected versionversion=8.9.1 <=8.9.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.41.0 <=7.41.0; version=7.41.0 <=8.9.1; version=7.42.0 <=7.42.0; version=7.42.1 <=7.42.1; version=7.43.0 <=7.43.0; version=7.44.0 <=7.44.0; version=7.45.0 <=7.45.0; version=7.46.0 <=7.46.0; version=7.47.0 <=7.47.0; version=7.47.1 <=7.47.1; version=7.48.0 <=7.48.0; version=7.49.0 <=7.49.0; version=7.49.1 <=7.49.1; version=7.50.0 <=7.50.0; version=7.50.1 <=7.50.1; version=7.50.2 <=7.50.2; version=7.50.3 <=7.50.3; version=7.51.0 <=7.51.0; version=7.52.0 <=7.52.0; version=7.52.1 <=7.52.1; version=7.53.0 <=7.53.0; version=7.53.1 <=7.53.1; version=7.54.0 <=7.54.0; version=7.54.1 <=7.54.1; version=7.55.0 <=7.55.0; version=7.55.1 <=7.55.1; version=7.56.0 <=7.56.0; version=7.56.1 <=7.56.1; version=7.57.0 <=7.57.0; version=7.58.0 <=7.58.0; version=7.59.0 <=7.59.0; version=7.60.0 <=7.60.0; version=7.61.0 <=7.61.0; version=7.61.1 <=7.61.1; version=7.62.0 <=7.62.0; version=7.63.0 <=7.63.0; version=7.64.0 <=7.64.0; version=7.64.1 <=7.64.1; version=7.65.0 <=7.65.0; version=7.65.1 <=7.65.1; version=7.65.2 <=7.65.2; version=7.65.3 <=7.65.3; version=7.66.0 <=7.66.0; version=7.67.0 <=7.67.0; version=7.68.0 <=7.68.0; version=7.69.0 <=7.69.0; version=7.69.1 <=7.69.1; version=7.70.0 <=7.70.0; version=7.71.0 <=7.71.0; version=7.71.1 <=7.71.1; version=7.72.0 <=7.72.0; version=7.73.0 <=7.73.0; version=7.74.0 <=7.74.0; version=7.75.0 <=7.75.0; version=7.76.0 <=7.76.0; version=7.76.1 <=7.76.1; version=7.77.0 <=7.77.0; version=7.78.0 <=7.78.0; version=7.79.0 <=7.79.0; version=7.79.1 <=7.79.1; version=7.80.0 <=7.80.0; version=7.81.0 <=7.81.0; version=7.82.0 <=7.82.0; version=7.83.0 <=7.83.0; version=7.83.1 <=7.83.1; version=7.84.0 <=7.84.0; version=7.85.0 <=7.85.0; version=7.86.0 <=7.86.0; version=7.87.0 <=7.87.0; version=7.88.0 <=7.88.0; version=7.88.1 <=7.88.1; version=8.0.0 <=8.0.0; version=8.0.1 <=8.0.1; version=8.1.0 <=8.1.0; version=8.1.1 <=8.1.1; version=8.1.2 <=8.1.2; version=8.2.0 <=8.2.0; version=8.2.1 <=8.2.1; version=8.3.0 <=8.3.0; version=8.4.0 <=8.4.0; version=8.5.0 <=8.5.0; version=8.6.0 <=8.6.0; version=8.7.0 <=8.7.0; version=8.7.1 <=8.7.1; version=8.8.0 <=8.8.0; version=8.9.0 <=8.9.0; version=8.9.1 <=8.9.1

Published CVSS scores

6.5SUSECVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
6.3SUSECVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

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.

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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-295Improper Certificate Validation

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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