Vulnerability in Python Software Foundation Cpython
CVE-2024-5642
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).
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.
EPSS exploit prediction
EPSS: 0.007 (53.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 53.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Python Software Foundation Cpython — versions 0, 3.10.0a1
Public proof-of-concept exploits
References
- jbp.io/2024/06/27/cve-2024-5535-openssl-memory-safety.html (third-party-advisory)
- github.com/python/cpython/pull/23014 (mitigation)
- mail.python.org/archives/list/security-announce@python.org/thread/PLP2JI3PJY33Y… (vendor-advisory)
- github.com/python/cpython/commit/39258d3595300bc7b952854c915f63ae2d4b9c3e (patch)
- www.openwall.com/lists/oss-security/2024/06/28/4
- github.com/python/cpython/issues/121227 (issue-tracking)
- security.netapp.com/advisory/ntap-20240726-0005/
- github.com/python/cpython/commit/a2cdbb6e8188ba9ba8b356b28d91bff60e86fe31 (patch)
Frequently asked questions
- What is CVE-2024-5642?
- CVE-2024-5642 is a medium-severity vulnerability in Python Software Foundation Cpython. CVSS score: 6.5/10. Published 2024-06-27.
- How severe is CVE-2024-5642?
- Medium severity. CVSS v3 base score is 6.5 out of 10.
- Is CVE-2024-5642 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.