CVE-2016-1252: canonical ubuntu_linux Improper Certificate Validation
Vulnerability summary
CVE-2016-1252 is a medium (CVSS 5.9) Improper Certificate Validation vulnerability in canonical ubuntu_linux. EPSS estimates a 7.25% chance of exploitation in the next 30 days, higher than 94.2% of scored vulnerabilities. 3 public exploits are recorded.
Timeline
- 05-12-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
5 scores · 3 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
7.25%
Chance of exploitation in the next 30 days
Percentile
94%
Versus all other CVEs
30-day change
-0.03 pp
From 7.27% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
3 foundExploit Reference (bugs.launchpad.net)
Maturity: unknown
Exploit Reference (bugs.chromium.org)
Maturity: unknown
APT - Repository Signing Bypass via Memory Allocation Failure
Maturity: weaponized
Weaknesses
CWE · root causeAffected systems
Debian2 products
- apt< 1.4~beta2 | < 1.0.9.8.4
- advanced_package_tool< 1.0.9.8.4
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 16.10
Ubuntu1 product
- apt< 1.0.1ubuntu2.17 | < 1.2.15ubuntu0.2
3 vendors · 4 products
References
10 links
- packetstormsecurity.com/files/140145/apt-Repository-Signing-Bypass.htmlX Refsource MISCIssue TrackingThird Party AdvisoryVDB Entry
- www.exploit-db.com/exploits/40916/ExploitX Refsource EXPLOIT DBIssue TrackingThird Party AdvisoryVDB Entry
- bugs.launchpad.net/ubuntu/+source/apt/+bug/1647467X Refsource CONFIRMExploitIssue TrackingThird Party Advisory
- bugs.chromium.org/p/project-zero/issues/detail?id=1020X Refsource MISCExploitIssue TrackingThird Party Advisory