7.4

CVE-2024-0397: Memory race condition in ssl.SSLContext certificate store methods

Deferred
AliasesUBUNTU-CVE-2024-0397DEBIAN-CVE-2024-0397openSUSE-SU-2024:14063-1
Published 17-06-2024Last modified 03-11-2025

Vulnerability summary

CVE-2024-0397 is a high (CVSS 7.4) vulnerability in python software foundation cpython. EPSS estimates a 0.81% chance of exploitation in the next 30 days, higher than 56.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.81%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 22 · Related 19
DLA-3980-1DSA-5759-1MGASA-2024-0317OPENSUSE-SU-2024:14082-1OPENSUSE-SU-2024:14295-1RHSA-2024:10983

Timeline

  1. 17-06-2024
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.81%

Chance of exploitation in the next 30 days

Percentile

57%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.81% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu8 products
  • python2.7All versions (No fix recorded)
  • python3.10< 3.10.12-1~22.04.5
  • python3.11All versions (No fix recorded)
  • python3.4All versions (No fix recorded)
  • python3.6All versions (No fix recorded)
Opensuse3 products
  • python310&distro=openSUSE Tumbleweed< 3.10.14-2.1
  • python38&distro=openSUSE Tumbleweed< 3.8.19-3.1
  • python39&distro=openSUSE Tumbleweed< 3.9.19-2.1
Debian2 products
  • pypy3All versions (No fix recorded) | < 7.3.16+dfsg-1
  • python3.11< 3.11.2-6+deb12u3
Chainguard1 product
  • python-3.9< 3.9.19-r2
Python software foundation1 product
  • cpython< 3.8.20 | ≥ 3.9.0, < 3.9.20 | ≥ 3.10.0, < 3.10.14 | ≥ 3.11.0, < 3.11.9 | ≥ 3.12.0, < 3.12.3 | ≥ 3.13.0a1, < 3.13.0a5

5 vendors · 15 products

References

20 links
Show all 20 references