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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…

Medium6.5EPSS 15.4%
Published
Updated
Reserved
Assigned by
redhat

Description

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."

Scores

CVSS scores of CVE-2016-0772, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.0Medium6.5CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
EPSS (exploitation in 30 days)
15.4% · top 3.2% of all CVEs (2 Nov 2026)

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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.5.

Weakness

Affected products

  • n/a

    • affected n/a

References (18)

Sources

The same CVE in the primary databases and aggregators, to check against.

Record last updated .