GHSA-6m57-q338-h677
GitHub Security Advisory
⚠ Unreviewed
MODERATE
Has CVE
Advisory Details
The smtplib library in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 does not return an error when StartTLS fails, which might allow man-in-the-middle attackers to bypass the TLS protections by leveraging a network position between the client and the registry to block the StartTLS command, aka a "StartTLS stripping attack."
Related CVEs
Key Information
5.0
/10
Dataset
Last updated: September 29, 2025 6:31 AM
Data from GitHub Advisory Database. This information is provided for research and educational purposes.