TI-2021-10599 Aliases CVE-2021-29982 GHSA-9x2f-wq24-4m7j

Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of…

LOW 31CWE-772Published 2021-08-17 · Updated 2024-08-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: High · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-772.

Summary

Due to incorrect JIT optimization, we incorrectly interpreted data from the wrong type of object, resulting in the potential leak of a single bit of memory. This vulnerability affects Firefox < 91 and Thunderbird < 91.

Why it matters now

EPSS 0.01124 66th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed Firefox (Mozilla): 91Thunderbird (Mozilla): 91

SSVC decision points

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

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox	before 91	91	Patch available	CNA
Mozilla	Thunderbird	before 91	91	Patch available	CNA

Firefox VendorMozilla Affected before 91 Fixed in 91 Patch available CNA
Thunderbird VendorMozilla Affected before 91 Fixed in 91 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 91.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 91.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 91.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 91.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 91
Fix · CNA Thunderbird (Mozilla) Fixed in 91

Fixed in the same release

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

Release · 2021-08-17
Mozilla Firefox 91
11 records Highest priority Priority MEDIUM 7 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2021-10606 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 41
- TI-2021-10605 Out-of-bounds read in Mozilla ThunderbirdPriority MEDIUM 41
- TI-2021-10602 Use after free in Mozilla ThunderbirdPriority MEDIUM 41
Show all 11 records →
Release · 2021-08-17
Mozilla Thunderbird 91
3 records Highest priority Priority MEDIUM 1 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2021-10598 An issue present in lowering/register allocation could have led to obscure but…Priority MEDIUM 40
- TI-2021-10604 Missing brute-force protection in Mozilla FirefoxPriority LOW 31
Show all 3 records →

Timeline

2026-10-02 Threatist record created from CVE-2021-29982
2026-10-03 Alias added: GHSA-9x2f-wq24-4m7j

References

Exploit 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1715318

Advisory 3

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