CVE-2012-0955: software-properties was vulnerable to a person-in-the-middle attack due to incorrect TLS certificate validatio

Q: How do I fix CVE-2012-0955?

software-properties: upgrade to 0.92. Exact commands for each OS are on this page.

Q: Is CVE-2012-0955 being exploited?

CVE-2012-0955 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2012-0955 affect?

CVE-2012-0955 affects software-properties. Severity is medium (CVSS 6.8). 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 unde

Q: How urgent is CVE-2012-0955?

Priority 41/100. Public exploit reference

This month

MEDIUM 6.8UPGRADE

CVE-2012-0955 is a medium-severity flaw (CVSS 6.8) affecting software-properties. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-295
Published	2020-12-02
Last modified	2026-06-16

Publisher (CNA): Canonical Ltd. · Vendor: canonical

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-12-02 01:15 UTCPublished CVE record published
2026-06-16 23:38 UTCUpdated Record last modified

canonical software-properties UPGRADE

Affected: < 0.92

Fixed in: 0.92

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy software-properties || rpm -q software-properties || software-properties --version

2. UPGRADE to 0.92 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade software-properties

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade software-properties

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2012-0955?

software-properties: upgrade to 0.92. Exact commands for each OS are on this page.

Is CVE-2012-0955 being exploited?

CVE-2012-0955 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2012-0955 affect?

CVE-2012-0955 affects software-properties. Severity is medium (CVSS 6.8). 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 unde

How urgent is CVE-2012-0955?

Priority 41/100. Public exploit reference

Related CVEs

CVE-2013-1061 MEDIUM 4.6 DOWNGRADE MITIGATE dbus/SoftwarePropertiesDBus.py in Software Properties 0.92.17 before 0.92.17.3, 0.92.9 before 0.92.9.3, and 0.
CVE-2011-4407 MEDIUM 4.3 UPGRADE MITIGATE ppa.py in Software Properties before 0.81.13.3 does not validate the server certificate when downloading PPA G

References

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