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."
Published: 2016-09-02
Score: 6.5 Medium
EPSS: 7.6% Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
Debian DLA Debian DLA DLA-522-1 python2.7 security update
Debian DLA Debian DLA DLA-871-1 python3.2 security update
Debian DLA Debian DLA DLA-1663-1 python3.4 security update
Ubuntu USN Ubuntu USN USN-3134-1 Python vulnerabilities
History

Sat, 12 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.10435}

epss

{'score': 0.06561}


Subscriptions

Python Python
Redhat Enterprise Linux Rhel Software Collections
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2024-08-05T22:30:04.119Z

Reserved: 2015-12-16T00:00:00.000Z

Link: CVE-2016-0772

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2016-09-02T14:59:00.127

Modified: 2026-05-06T22:30:45.220

Link: CVE-2016-0772

cve-icon Redhat

Severity : Moderate

Publid Date: 2016-06-11T00:00:00Z

Links: CVE-2016-0772 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses