VULNERABILITY INTELLIGENCE

CVE-2021-29958

CVSS score4.3 MEDIUM

EPSS probability0.67%

CISA KEVNot currently listed

Published2021-06-24

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Description

When a download was initiated, the client did not check whether it was in normal or private browsing mode, which led to private mode cookies being shared in normal browsing mode. This vulnerability affects Firefox for iOS < 34.

Weakness classification

nvd@nist.gov: CWE-862

Primary references

security@mozilla.org — Permissions Required, Vendor Advisory
security@mozilla.org — Release Notes, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Permissions Required, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108 — Release Notes, Vendor Advisory