CVE-2012-0955

software-properties incorrectly validated TLS certificates

6.8 MediumFix available

software-properties was vulnerable to a person-in-the-middle attack due to incorrect TLS certificate validation in softwareproperties/ppa.py. software-properties didn't check TLS certificates under python2 and only checked certificates under python3 if a valid certificate bundle was provided. Fixed in software-properties version 0.92.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.61%Down 0.3 points since Feb 4, 2022

What each source reports

CVE List Score used 6.8

software-properties incorrectly validated TLS certificates

Record: CVE-2012-0955
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Weakness: CWE-295
Updated: 2026-11-02

EUVDEUVD-2012-0978 6.8

Record: EUVD-2012-0978
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Updated: 2026-11-03

GitHub AdvisoriesGHSA-47v9-xw5c-g56f No score

software-properties was vulnerable to a person-in-the-middle attack due to incorrect TLS...

Record: GHSA-47v9-xw5c-g56f
Weakness: CWE-295
Updated: 2026-11-02

NVD 6.8

Record: CVE-2012-0955
CVSS 3.1: 6.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0: 5.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:N
Weakness: CWE-295
Updated: 2026-11-02

OSV 7.4

Record: CVE-2012-0955
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

OSVDEBIAN-CVE-2012-0955 7.4

Record: DEBIAN-CVE-2012-0955
CVSS 3.1: 7.4 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated: 2026-11-02

Affected products

canonical software-properties

Affected packages

Affected packages
Package	Affected	Fixed
`software-properties` Debian:12	before 0.92.25debian1	0.92.25debian1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, published	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2012-0955 is a medium vulnerability (CVSS 6.8) in Canonical Software-properties, published December 2, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.61%, the 49th percentile. Fixed in software-properties 0.92.25debian1.