TI-2020-09943 Aliases CVE-2020-12425 GHSA-j6wx-wmhj-cffc

Out-of-bounds read in Mozilla Firefox

LOW 32CWE-125Published 2020-07-09 · 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: Partial Red Hat: 9 fixed, 2 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-125 and the CVSS impact.

Summary

Due to confusion processing a hyphen character in Date.parse(), a one-byte out of bounds read could have occurred, leading to potential information disclosure. This vulnerability affects Firefox < 78.

Why it matters now

EPSS 0.01573 75th percentileScored 2026-11-07

Fix Partial Firefox (Mozilla): 78Red Hat: 4 advisoriesRed Hat: 9 fixed, 2 without a fix

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 78	78	Patch available	CNA

Firefox VendorMozilla Affected before 78 Fixed in 78 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 78.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 78.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 78

Red Hat 4 advisories

RHSA-2020:4080 Released 2020-09-30 · Red Hat rating Important
firefox security and bug fix update
- Red Hat Enterprise Linux Client (v. 7) firefox-78.3.0-1.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-78.3.0-1.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-78.3.0-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-78.3.0-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-78.3.0-1.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-78.3.0-1.el7_9
RHSA-2020:3559 Released 2020-08-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.1) firefox-78.2.0-3.el8_1
RHSA-2020:3557 Released 2020-08-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-78.2.0-2.el8_2

Show 1 more Red Hat advisories

RHSA-2020:3555 Released 2020-08-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox-78.2.0-3.el8_0

Fixed in the same release

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

Advisory · 2020-07-09
Mozilla Firefox — openSUSE-SU-2020:0983
13 records Highest priority Priority MEDIUM 6 MEDIUM, 7 LOW
Other records, highest priority first
- TI-2020-09937 Use after free in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09935 Reachable assertion in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09940 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
Show all 13 records → Advisory →
Advisory · 2020-07-09
Mozilla Firefox — openSUSE-SU-2020:1017
13 records Highest priority Priority MEDIUM 6 MEDIUM, 7 LOW
Other records, highest priority first
- TI-2020-09937 Use after free in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09935 Reachable assertion in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09940 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
Show all 13 records → Advisory →

Show 1 more group

Advisory · 2020-07-09
Mozilla Firefox — GLSA-202007-10
12 records Highest priority Priority MEDIUM 6 MEDIUM, 6 LOW
Other records, highest priority first
- TI-2020-09937 Use after free in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09935 Reachable assertion in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2020-09940 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
Show all 12 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 5	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2020:3557
Red Hat Enterprise Linux AppStream E4S (v. 8.0)	Fixed	RHSA-2020:3555
Red Hat Enterprise Linux AppStream EUS (v. 8.1)	Fixed	RHSA-2020:3559
Red Hat Enterprise Linux Client (v. 7)	Fixed	RHSA-2020:4080
Red Hat Enterprise Linux Client Optional (v. 7)	Fixed	RHSA-2020:4080
Red Hat Enterprise Linux Server (v. 7)	Fixed	RHSA-2020:4080
Red Hat Enterprise Linux Server Optional (v. 7)	Fixed	RHSA-2020:4080
Red Hat Enterprise Linux Workstation (v. 7)	Fixed	RHSA-2020:4080
Red Hat Enterprise Linux Workstation Optional (v. 7)	Fixed	RHSA-2020:4080

Timeline

2026-10-02 Threatist record created from CVE-2020-12425
2026-10-03 Alias added: GHSA-j6wx-wmhj-cffc

References

Advisory 5

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