CVE-2024-5642

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2024-06-27. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.set_npn_protocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN being not widely used and specifying an empty list likely being uncommon in-practice (typically a protocol name would be configured).

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
30(Track)
EG Risk 30/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
53%
KEV
Not listed

Published

June 27, 2024

Last Modified

July 31, 2026

Advisory Details (8)

Auto-updated Jul 31, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr, github_commit.
github_commit

commit a2cdbb6e8188 (python/cpython)

Fix landed in python/cpython commit a2cdbb6e8188 — awaiting tagged release

https://github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20240726-0005/
generic

Disallow setting an empty list for NPN in CPython 3.9 and earlier · Issue #121227 · python/cpython · GitHub

https://github.com/python/cpython/issues/121227
generic

oss-security - Fwd: [Security-announce][CVE-2024-5642] Buffer over-read in SSLContext.set_npn_protocols() for Python 3.9 and earlier

http://www.openwall.com/lists/oss-security/2024/06/28/4
github_commit

commit 39258d359530 (python/cpython)

Fix landed in python/cpython commit 39258d359530 — awaiting tagged release

https://github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e
generic

Mailman 3 [CVE-2024-5642] Buffer over-read in SSLContext.set_npn_protocols() for Python 3.9 and earlier - Security-announce - python.org

https://mail.python.org/archives/list/[email protected]/thread/PLP2JI3PJY33YG6P5BZYSSNU66HASXBQ/
github_pr

bpo-43669: PEP 644: Require OpenSSL 1.1.1 or newer (GH-23014)

Fix merged in python/cpython PR #23014 on 2021-04-17 — awaiting tagged release

https://github.com/python/cpython/pull/23014
generic

jbp.io :: CVE-2024-5535: `SSL_select_next_proto` buffer overread

https://jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html

Vendor Advisories for CVE-2024-5642(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhceph/rhceph-8-rhel9:17695123832026-02-02redhat
redhatrhui5/rhua-rhel9:17683770122026-01-15redhat
redhatdiscovery/discovery-ui-rhel9:17679045732026-01-08redhat
redhatpython3.9-0:3.9.25-2.el9_72025-12-18redhat
redhatpython39-devel:3.9-8100020251126112422.d47b87a42025-12-18redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 4 ecosystems)
Debian:11(3)
PackageVulnerable rangeFixed inDependents
pypy37.3.10+dfsg-1 ... 7.3.9+dfsg-5 (53 versions)——
python2.72.7.18-10 ... 2.7.18-9 (10 versions)——
python3.93.9.10-1 ... 3.9.9-4 (29 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
pypy3—7.3.10+dfsg-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
pypy3—7.3.10+dfsg-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
pypy3—7.3.10+dfsg-1—

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 184 total refreshes for this CVE.

  1. 2026-09-18 19:26 UTCEPSS rescore
  2. 2026-09-16 14:06 UTCEPSS rescore
  3. 2026-09-16 14:06 UTCEPSS rescore
  4. 2026-09-16 05:12 UTCEPSS rescore
  5. 2026-09-15 03:08 UTCEPSS rescore
  6. 2026-09-13 16:45 UTCEPSS rescore
  7. 2026-09-12 14:59 UTCEPSS rescore
  8. 2026-09-11 14:51 UTCEPSS rescore
  9. 2026-09-11 09:35 UTCEPSS rescore
  10. 2026-09-10 09:33 UTCEPSS rescore
  11. 2026-09-08 21:59 UTCEPSS rescore
  12. 2026-09-07 16:00 UTCEPSS rescore
  13. 2026-09-06 13:46 UTCEPSS rescore
  14. 2026-09-04 13:59 UTCEPSS rescore
  15. 2026-09-04 05:05 UTCEPSS rescore
  16. 2026-09-02 14:10 UTCEPSS rescore
  17. 2026-09-01 20:27 UTCOSV refresh
  18. 2026-09-01 13:52 UTCEPSS rescore
  19. 2026-08-30 19:16 UTCEPSS rescore
  20. 2026-08-30 19:16 UTCEPSS rescore
  21. 2026-08-30 01:21 UTCEPSS rescore
  22. 2026-08-28 21:39 UTCEPSS rescore
  23. 2026-08-27 14:24 UTCEPSS rescore
  24. 2026-08-26 14:44 UTCEPSS rescore
  25. 2026-08-25 13:47 UTCEPSS rescore
Show 75 more
  1. 2026-08-24 14:15 UTCEPSS rescore
  2. 2026-08-23 00:18 UTCEPSS rescore
  3. 2026-08-21 23:47 UTCEPSS rescore
  4. 2026-08-20 22:54 UTCEPSS rescore
  5. 2026-08-19 17:02 UTCEPSS rescore
  6. 2026-08-18 13:47 UTCEPSS rescore
  7. 2026-08-17 13:45 UTCEPSS rescore
  8. 2026-08-16 14:55 UTCEPSS rescore
  9. 2026-08-16 02:13 UTCEPSS rescore
  10. 2026-08-15 22:07 UTCOSV refresh
  11. 2026-08-15 01:29 UTCEPSS rescore
  12. 2026-08-13 21:59 UTCEPSS rescore
  13. 2026-08-12 13:49 UTCEPSS rescore
  14. 2026-08-11 13:41 UTCEPSS rescore
  15. 2026-08-10 23:58 UTCEPSS rescore
  16. 2026-08-09 13:45 UTCEPSS rescore
  17. 2026-08-08 16:35 UTCEPSS rescore
  18. 2026-08-07 16:26 UTCEPSS rescore
  19. 2026-08-06 13:45 UTCEPSS rescore
  20. 2026-08-05 19:16 UTCEPSS rescore
  21. 2026-08-04 15:08 UTCEPSS rescore
  22. 2026-08-03 10:35 UTCEPSS rescore
  23. 2026-08-02 02:25 UTCEPSS rescore
  24. 2026-08-02 02:25 UTCEPSS rescore
  25. 2026-08-01 04:14 UTCEPSS rescore
  26. 2026-07-31 15:27 UTCVendor advisory
  27. 2026-07-31 15:27 UTCGHSA enrichment
  28. 2026-07-31 14:51 UTCEG score recompute
  29. 2026-07-31 14:51 UTCVendor advisory
  30. 2026-07-31 14:51 UTCGHSA enrichment
  31. 2026-07-30 16:26 UTCEPSS rescore
  32. 2026-07-30 16:26 UTCEPSS rescore
  33. 2026-07-30 01:29 UTCEPSS rescore
  34. 2026-07-28 15:35 UTCEPSS rescore
  35. 2026-07-28 11:50 UTCOSV refresh
  36. 2026-07-26 14:53 UTCEPSS rescore
  37. 2026-07-25 14:17 UTCEPSS rescore
  38. 2026-07-25 14:17 UTCEPSS rescore
  39. 2026-07-24 14:16 UTCEPSS rescore
  40. 2026-07-23 14:17 UTCEPSS rescore
  41. 2026-07-23 14:17 UTCEPSS rescore
  42. 2026-07-23 02:45 UTCEG score recompute
  43. 2026-07-22 14:07 UTCEPSS rescore
  44. 2026-07-21 15:23 UTCEPSS rescore
  45. 2026-07-20 17:07 UTCEPSS rescore
  46. 2026-07-19 14:30 UTCEPSS rescore
  47. 2026-07-19 14:30 UTCEPSS rescore
  48. 2026-07-19 02:28 UTCEPSS rescore
  49. 2026-07-19 02:28 UTCEPSS rescore
  50. 2026-07-18 10:03 UTCEPSS rescore
  51. 2026-07-16 17:02 UTCEPSS rescore
  52. 2026-07-15 16:57 UTCEPSS rescore
  53. 2026-07-15 01:59 UTCEPSS rescore
  54. 2026-07-15 01:59 UTCEPSS rescore
  55. 2026-07-13 22:29 UTCEPSS rescore
  56. 2026-07-13 06:12 UTCEPSS rescore
  57. 2026-07-12 05:45 UTCEPSS rescore
  58. 2026-07-11 08:26 UTCEPSS rescore
  59. 2026-07-11 03:52 UTCOSV refresh
  60. 2026-07-09 19:09 UTCEPSS rescore
  61. 2026-07-09 19:09 UTCEPSS rescore
  62. 2026-07-08 15:14 UTCEPSS rescore
  63. 2026-07-07 13:45 UTCEPSS rescore
  64. 2026-07-07 13:45 UTCEPSS rescore
  65. 2026-07-06 16:26 UTCEPSS rescore
  66. 2026-07-06 16:26 UTCEPSS rescore
  67. 2026-07-06 02:22 UTCEPSS rescore
  68. 2026-07-05 02:29 UTCEPSS rescore
  69. 2026-07-04 06:30 UTCEPSS rescore
  70. 2026-07-04 06:30 UTCEPSS rescore
  71. 2026-07-01 15:06 UTCEPSS rescore
  72. 2026-06-30 23:21 UTCEPSS rescore
  73. 2026-06-30 23:21 UTCEPSS rescore
  74. 2026-06-29 14:05 UTCEPSS rescore
  75. 2026-06-28 14:07 UTCEPSS rescore

Frequently asked(5)

What is CVE-2024-5642?
CVE-2024-5642 is a medium vulnerability published on June 27, 2024. CPython 3.9 and earlier doesn't disallow configuring an empty list ("[]") for SSLContext.setnpnprotocols() which is an invalid value for the underlying OpenSSL API. This results in a buffer over-read when NPN is used (see CVE-2024-5535 for OpenSSL). This vulnerability is of low severity due to NPN…
When was CVE-2024-5642 disclosed?
CVE-2024-5642 was first published in the National Vulnerability Database on June 27, 2024, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-5642 actively exploited?
CVE-2024-5642 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 46.8% of all scored CVEs.
What is the CVSS score of CVE-2024-5642?
CVE-2024-5642 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2024-5642?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-5642, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-5642

Explore →

Is Your Infrastructure Affected by CVE-2024-5642?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs