Vulnerability Database

300,444

Total vulnerabilities in the database

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 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."

  • Published: Sep 2, 2016
  • Updated: Nov 9, 2025
  • CVE: CVE-2016-0772
  • Severity: Medium
  • Exploit:

CVSS v2:

  • Severity: Medium
  • Score: 5.8
  • AV:N/AC:M/Au:N/C:P/I:P/A:N

CWEs:

Software From Fixed in
python / python 3.5.0 3.5.0.x
python / python 3.5.1 3.5.1.x
python / python 3.1.1 3.1.1.x
python / python 3.3.2 3.3.2.x
python / python 3.0 3.0.x
python / python 3.0.1 3.0.1.x
python / python 3.2.2 3.2.2.x
python / python 3.1.0 3.1.0.x
python / python 3.2.5 3.2.5.x
python / python 3.1.5 3.1.5.x
python / python 3.3.6 3.3.6.x
python / python 3.4.0 3.4.0.x
python / python 3.2.1 3.2.1.x
python / python 3.2.0 3.2.0.x
python / python 3.3.1 3.3.1.x
python / python 3.4.3 3.4.3.x
python / python 3.4.4 3.4.4.x
python / python 3.1.2 3.1.2.x
python / python 3.3.4 3.3.4.x
python / python 3.3.5 3.3.5.x
python / python 3.2.3 3.2.3.x
python / python 3.2.6 3.2.6.x
python / python 3.3.0 3.3.0.x
python / python 3.4.2 3.4.2.x
python / python 3.3.3 3.3.3.x
python / python 3.2.4 3.2.4.x
python / python 3.4.1 3.4.1.x
python / python 3.1.3 3.1.3.x
python / python 3.1.4 3.1.4.x
python / python - 2.7.11.x