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TI-2021-10575 Aliases CVE-2021-29958GHSA-5j3q-vmj5-h7fx

Missing authorization in Mozilla Firefox for iOS

Priority LOW 21CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-862.

Summary

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.

Why it matters now

EPSS 0.00671 52nd percentileScored 2026-11-07
Fix Fixed Firefox for iOS (Mozilla): 34

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefox for iOSbefore 3434Patch availableCNA
  • Firefox for iOS VendorMozilla Affected before 34 Fixed in 34 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:*before 34.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:iphone_os:*:* Versions before 34.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox for iOS (Mozilla) Fixed in 34

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29958
  2. 2026-10-03 Alias added: GHSA-5j3q-vmj5-h7fx

References

Advisory 2

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences