TI-2020-12341 Aliases CVE-2020-15666 GHSA-5jw8-m77m-3jjm

Information disclosure through error messages in Mozilla Firefox

LOW 31CWE-209Published 2020-10-01 · Updated 2024-08-04

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-209.

Summary

When trying to load a non-video in an audio/video context the exact status code (200, 302, 404, 500, 412, 403, etc.) was disclosed via the MediaError Message. This level of information leakage is inconsistent with the standardized onerror/onsuccess disclosure and can lead to inferring login status to services or device discovery on a local network among other attacks. This vulnerability affects Firefox < 80 and Firefox for Android < 80.

Why it matters now

EPSS 0.01238 69th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed Firefox (Mozilla): 80Firefox for Android (Mozilla): 80

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 80	80	Patch available	CNA
Mozilla	Firefox for Android	before 80	80	Patch available	CNA

Firefox VendorMozilla Affected before 80 Fixed in 80 Patch available CNA
Firefox for Android VendorMozilla Affected before 80 Fixed in 80 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::-::*	before 80.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_mobile::::::android::*	before 80.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:-:*:* Versions before 80.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_mobile:*:*:*:*:*:android:*:* Versions before 80.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 80
Fix · CNA Firefox for Android (Mozilla) Fixed in 80

Fixed in the same release

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

Release · 2020-10-01
Mozilla Firefox 80
7 records Highest priority Priority MEDIUM 3 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2020-12338 Uncontrolled search path in Mozilla FirefoxPriority MEDIUM 43
- TI-2020-12342 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 41
- TI-2020-12345 Race condition in Mozilla FirefoxPriority MEDIUM 40
Show all 7 records →
Release · 2020-10-01
Mozilla Firefox for Android 80
5 records Highest priority Priority MEDIUM 1 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2020-12345 Race condition in Mozilla FirefoxPriority MEDIUM 40
- TI-2020-12339 Incorrect authorization in Mozilla FirefoxPriority LOW 32
- TI-2020-12343 A lock was missing when accessing a data structure and importing certificate information…Priority LOW 21
Show all 5 records →

Timeline

2026-10-02 Threatist record created from CVE-2020-15666
2026-10-03 Alias added: GHSA-5jw8-m77m-3jjm

References

Exploit 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1450853

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