CVE-2024-5642
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Buffer overread when using an empty list with SSLContext.set_npn_protocols()
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Hindsight · the state
Foresight · where to check next
No weakness class or product neighbourhood is held for this record, so this index cannot name anywhere to check next. That is an absence in the record, not a finding about the software.
Running Python Software Foundation CPython? Check your version
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CISA KEV & Federal Remediation Deadline from the record and CISA
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Exploit Status & Known PoCs a ladder, not a score
Current rung: Nothing observed in held sources.
- RUNG 1Nothing observed in held sources
- RUNG 2Proof-of-concept published
- RUNG 3Exploited in the wild · CISA KEV listed
- RUNG 4Ransomware campaign use known
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What it is stated by the CNA
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). receipt
check it yourself jbp.io github.com mail.python.org github.com openwall.com github.com +2 morereceipt
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 41 observations
41 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Exploit probability more than doubled between 2025-03-28 and 2025-03-29 (0.00527 → 0.01684) and the record had been public for 1 year, 11 months when this index was last written.
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