TI-2021-19420 Aliases CVE-2021-43530 GHSA-mgfp-hcp6-39f4

Cross-site scripting in Mozilla Firefox

LOW 30CWE-79Published 2021-12-08 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Cross-site scripting
Confidentiality · integrity · availability: Low · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.

Summary

A Universal XSS vulnerability was present in Firefox for Android resulting from improper sanitization when processing a URL scanned from a QR code. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 94.

Why it matters now

EPSS 0.01414 72nd percentileScored 2026-11-07

Fix Fixed Firefox (Mozilla): 94

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 94	94	Patch available	CNA

Firefox VendorMozilla Affected before 94 Fixed in 94 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 94.0	Vulnerable	Mozilla
cpe:2.3:o:google:android:-:::::::*	not specified by NVD	Running on	Google

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 94.0 Vulnerable ·Mozilla
cpe:2.3:o:google:android:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Google

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 94

Fixed in the same release

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

Release · 2021-12-08
Mozilla Firefox 94
6 records Highest priority Priority MEDIUM 1 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2021-16110 The executable file warning was not presented when downloading .inetloc files, which, due…Priority MEDIUM 40
- TI-2021-16105 Exposure of resource to wrong sphere in Mozilla FirefoxPriority LOW 31
- TI-2021-19422 Open redirect in Mozilla FirefoxPriority LOW 28
Show all 6 records →

Timeline

2026-10-02 Threatist record created from CVE-2021-43530
2026-10-03 Alias added: GHSA-mgfp-hcp6-39f4

References

Advisory 1

https://www.mozilla.org/security/advisories/mfsa2021-48/

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1736886

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