CVE-2016-0772
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...
- Published
- Sep 2, 2016
- Updated
- Aug 5, 2024
- Assigning CNA
- redhat
- Evidence observed
- Jul 3, 2016
Primary CVSS
nvd · CVSS 3.0
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:NModerate · next 30 days
- Percentile
- 96.9%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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."
Sources
2- pubPoC
Vulnerability Notes, PoC Exploits and Write-Ups for security issues disclosed by tintinweb
tintinweb · multiple · Jul 3, 2016
Responsible use
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