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TI-2021-10580 Aliases CVE-2021-29963GHSA-vjmq-qgx6-29w9

Insufficient verification of data authenticity in Mozilla Firefox

Priority LOW 20CWE-345Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-345.

Summary

Address bar search suggestions in private browsing mode were re-using session data from normal mode. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 89.

Why it matters now

EPSS 0.00334 26th percentileScored 2026-11-07
Fix Fixed Firefox (Mozilla): 89

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
MozillaFirefoxbefore 8989Patch availableCNA
  • Firefox VendorMozilla Affected before 89 Fixed in 89 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:*before 89.0VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:android:*:* Versions before 89.0 Vulnerable ·Mozilla

Remediation

  • Fix · CNA Firefox (Mozilla) Fixed in 89

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Mozilla Firefox 89

    5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW

    Other records, highest priority first

    • TI-2021-10584 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 41
    • TI-2021-10581 Out-of-bounds read in Mozilla ThunderbirdPriority LOW 33
    • TI-2021-10582 A malicious website that causes an HTTP Authentication dialog to be spawned could trick…Priority LOW 25
    Show all 5 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-29963
  2. 2026-10-03 Alias added: GHSA-vjmq-qgx6-29w9

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