How severe is CVE-2012-0955?

CVE-2012-0955 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2012-0955 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2012-0955?

CVE-2012-0955 affects Canonical Software-properties. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2012-0955?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2012-0955 published?

CVE-2012-0955 was published on 2020-12-02 and last updated on 2026-06-16.

CVE-2012-0955

CVE-2012-0955 is a medium-severity vulnerability in Canonical Software-properties with a CVSS 3.x base score of 6.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-295.

Key facts

Severity: Medium (CVSS 3.x base score 6.8)
CVSS v2: 5.8
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-295
Affected product: Canonical Software-properties
Published: 2020-12-02
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2012-0955?: 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.
How severe is CVE-2012-0955?: CVE-2012-0955 has a CVSS 3.x base score of 6.8, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2012-0955 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2012-0955?: CVE-2012-0955 affects Canonical Software-properties. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2012-0955?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2012-0955 published?: CVE-2012-0955 was published on 2020-12-02 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:canonical:software-properties:*:*:*:*:*:*:*:*

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