CVE-2012-0955

Name: CVE-2012-0955
Creator: NVD / NIST
Published: 2020-12-02T01:15:11.797+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.4/10EPSS 0.61%

Last modified Jun 16, 2026

CVE-2012-0955 is a high-severity vulnerability rated 7.4/10 on the CVSS scale. 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. EPSS estimates a 0.61% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.4/10

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

EPSS Probability

0.61%

44.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Canonical	Software-Properties	< 0.92

References

https://code.launchpad.net/~cyphermox/software-properties/lp1036839/+merge/119753Patch, Vendor Advisory
https://launchpad.net/bugs/1036839Exploit, Vendor Advisory
https://code.launchpad.net/~cyphermox/software-properties/lp1036839/+merge/119753Patch, Vendor Advisory
https://launchpad.net/bugs/1036839Exploit, Vendor Advisory

Timeline

Published: Dec 2, 2020
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2012-0955?

How severe is CVE-2012-0955?

CVE-2012-0955 has a CVSS score of 7.4/10 (HIGH severity). The EPSS model estimates a 0.61% probability of exploitation in the next 30 days.

How do I fix CVE-2012-0955?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2012-0955?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST