What is CVE-2007-5967?

CVE-2007-5967 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2021-05-17.

How severe is CVE-2007-5967?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Mozilla Firefox

CVE-2007-5967

A flaw in Mozilla's embedded certificate code might allow web sites to install root certificates on devices without user approval.

Vulnerability class: Improper Certificate Validation

Published 2021-05-17 · last modified 2026-06-16.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (39.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Mozilla Firefox
Mozilla Firefox

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

bugzilla-dev.allizom.org/show_bug.cgi (Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2007-5967?: CVE-2007-5967 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Certificate Validation. CVSS score: 6.5/10. Published 2021-05-17.
How severe is CVE-2007-5967?: Medium severity. CVSS v3 base score is 6.5 out of 10.