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Vulnerability record · CVE-2016-1252 · published 5 December 2017

CVE-2016-1252: Debian advanced package tool improper certificate validation vulnerability

Debian · Advanced Package Tool

The apt package in Debian jessie before 1.0.9.8.4, in Debian unstable before 1.4~beta2, in Ubuntu 14.04 LTS before 1.0.1ubuntu2.17, in Ubuntu 16.04 LTS before 1.2.15ubuntu0.2, and in Ubuntu 16.10 before 1.3.2ubuntu0.1 allows man-in-the-middle attackers to bypass a repository-signing protection mechanism by leveraging improper error handling when validating InRelease file signatures.

5.9 CVSS 3.1 Medium EPSS 7.3% · top 5.9% CWE-295 · Improper certificate validation
5.9CVSS 3.1 base score, v2 4.3
7.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
12References, 6 tagged exploit
17 Jun 2026Last modified by NVD

Description

The apt package in Debian jessie before 1.0.9.8.4, in Debian unstable before 1.4~beta2, in Ubuntu 14.04 LTS before 1.0.1ubuntu2.17, in Ubuntu 16.04 LTS before 1.2.15ubuntu0.2, and in Ubuntu 16.10 before 1.3.2ubuntu0.1 allows man-in-the-middle attackers to bypass a repository-signing protection mechanism by leveraging improper error handling when validating InRelease file signatures.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://packetstormsecurity.com/files/140145/apt-Repository-Signing-Bypass.html Issue TrackingThird Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-3156-1 Third Party Advisory
https://bugs.chromium.org/p/project-zero/issues/detail?id=1020 ExploitIssue TrackingThird Party Advisory
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1647467 ExploitIssue TrackingThird Party Advisory
https://www.debian.org/security/2016/dsa-3733 Issue TrackingVendor Advisory
https://www.exploit-db.com/exploits/40916/ ExploitIssue TrackingThird Party AdvisoryVDB Entry
http://packetstormsecurity.com/files/140145/apt-Repository-Signing-Bypass.html Issue TrackingThird Party AdvisoryVDB Entry
http://www.ubuntu.com/usn/USN-3156-1 Third Party Advisory
https://bugs.chromium.org/p/project-zero/issues/detail?id=1020 ExploitIssue TrackingThird Party Advisory
https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1647467 ExploitIssue TrackingThird Party Advisory
https://www.debian.org/security/2016/dsa-3733 Issue TrackingVendor Advisory
https://www.exploit-db.com/exploits/40916/ ExploitIssue TrackingThird Party AdvisoryVDB Entry

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2016-1252), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.