CVE-2024-0397
CVE-2024-0397 is a high-severity vulnerability with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-362.
Key facts
- Severity: High (CVSS 3.x base score 7.4)
- EPSS exploit prediction: 1% (52nd percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2024-16193
- Weakness: CWE-362
- Published:
- Last modified:
Description
A defect was discovered in the Python “ssl” module where there is a memory race condition with the ssl.SSLContext methods “cert_store_stats()” and “get_ca_certs()”. The race condition can be triggered if the methods are called at the same time as certificates are loaded into the SSLContext, such as during the TLS handshake with a certificate directory configured. This issue is fixed in CPython 3.10.14, 3.11.9, 3.12.3, and 3.13.0a5.
Frequently asked questions
- What is CVE-2024-0397?
- A defect was discovered in the Python “ssl” module where there is a memory race condition with the ssl.SSLContext methods “cert_store_stats()” and “get_ca_certs()”. The race condition can be triggered if the methods are called at the same time as certificates are loaded into the SSLContext, such as during the TLS handshake with a certificate directory configured. This issue is fixed in CPython 3.10.14, 3.11.9, 3.12.3, and 3.13.0a5.
- How severe is CVE-2024-0397?
- CVE-2024-0397 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2024-0397 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2024-0397?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2024-0397 have an EU (EUVD) identifier?
- Yes. CVE-2024-0397 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-16193.
- When was CVE-2024-0397 published?
- CVE-2024-0397 was published on 2024-06-17 and last updated on 2026-06-17.
References
- http://www.openwall.com/lists/oss-security/2024/06/17/2
- https://github.com/python/cpython/commit/01c37f1d0714f5822d34063ca7180b595abf589d
- https://github.com/python/cpython/commit/29c97287d205bf2f410f4895ebce3f43b5160524
- https://github.com/python/cpython/commit/37324b421b72b7bc9934e27aba85d48d4773002e
- https://github.com/python/cpython/commit/542f3272f56f31ed04e74c40635a913fbc12d286
- https://github.com/python/cpython/commit/b228655c227b2ca298a8ffac44d14ce3d22f6faa
- https://github.com/python/cpython/commit/bce693111bff906ccf9281c22371331aaff766ab
- https://github.com/python/cpython/issues/114572
- https://github.com/python/cpython/pull/114573
- https://mail.python.org/archives/list/[email protected]/thread/BMAK5BCGKYWNJOACVUSLUF6SFGBIM4VP/
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html
- https://security.netapp.com/advisory/ntap-20250411-0006/
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