TI-2020-05531 Aliases CVE-2020-6822 GHSA-v2mh-4gcf-6ghr

Out-of-bounds write in Mozilla Thunderbird

MEDIUM 41CWE-787Published 2020-04-24 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 15 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

On 32-bit builds, an out of bounds write could have occurred when processing an image larger than 4 GB in <code>GMPDecodeData</code>. It is possible that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.

Why it matters now

EPSS 0.01325 71st percentileScored 2026-11-07

Fix Partial Thunderbird (Mozilla): 68.7.0Firefox ESR (Mozilla): 68.7+1 more productRed Hat: 8 advisoriesRed Hat: 15 fixed, 1 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	Thunderbird	before 68.7.0	68.7.0	Patch available	CNA
Mozilla	Firefox ESR	before 68.7	68.7	Patch available	CNA
Mozilla	Firefox	before 75	75	Patch available	CNA

Thunderbird VendorMozilla Affected before 68.7.0 Fixed in 68.7.0 Patch available CNA
Firefox ESR VendorMozilla Affected before 68.7 Fixed in 68.7 Patch available CNA
Firefox VendorMozilla Affected before 75 Fixed in 75 Patch available CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 75.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_esr::::::::	before 68.7.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 68.7.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 75.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 68.7.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 68.7.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Thunderbird (Mozilla) Fixed in 68.7.0
Fix · CNA Firefox ESR (Mozilla) Fixed in 68.7
Fix · CNA Firefox (Mozilla) Fixed in 75

Red Hat 8 advisories

RHSA-2020:1495 Released 2020-04-16 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-68.7.0-1.el8_1
RHSA-2020:1496 Released 2020-04-16 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) thunderbird-68.7.0-1.el8_0
RHSA-2020:1488 Released 2020-04-16 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux Desktop (v. 6) thunderbird-68.7.0-1.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-68.7.0-1.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) thunderbird-68.7.0-1.el6_10

Show 5 more Red Hat advisories

RHSA-2020:1489 Released 2020-04-16 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-68.7.0-1.el7_8
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-68.7.0-1.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-68.7.0-1.el7_8
RHSA-2020:1429 Released 2020-04-14 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux Desktop (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux Server (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux Server Optional (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux Workstation (v. 6) firefox-68.7.0-2.el6_10
- Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-68.7.0-2.el6_10
RHSA-2020:1420 Released 2020-04-09 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-68.7.0-2.el7_8
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-68.7.0-2.el7_8
- Red Hat Enterprise Linux Server (v. 7) firefox-68.7.0-2.el7_8
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-68.7.0-2.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) firefox-68.7.0-2.el7_8
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-68.7.0-2.el7_8
RHSA-2020:1406 Released 2020-04-08 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-68.7.0-2.el8_1
RHSA-2020:1404 Released 2020-04-08 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) firefox-68.7.0-2.el8_0

Fixed in the same release

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

Release · 2020-04-24
Mozilla Firefox 75
6 records Highest priority Priority MEDIUM 4 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2020-05534 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 46
- TI-2020-05535 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 45
- TI-2020-05532 Missing authorization in Mozilla FirefoxPriority MEDIUM 45
Show all 6 records →
Release · 2020-04-24
Mozilla Firefox ESR 68.7
5 records Highest priority Priority MEDIUM 2 MEDIUM, 3 LOW
Other records, highest priority first
- TI-2020-05534 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 46
- TI-2020-05537 Path traversal in Mozilla Firefox ESRPriority LOW 36
- TI-2020-05530 Use of uninitialized resource in Mozilla ThunderbirdPriority LOW 36
Show all 5 records →

Show 1 more group

Release · 2020-04-24
Mozilla Thunderbird 68.7.0
5 records Highest priority Priority CRITICAL 2 CRITICAL, 2 MEDIUM, 1 LOW
Other records, highest priority first
- TI-2020-05529 Race condition in Mozilla ThunderbirdPriority CRITICAL 94
- TI-2020-05528 Use after free in Mozilla ThunderbirdPriority CRITICAL 94
- TI-2020-05534 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 46
Show all 5 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. 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 AppStream (v. 8)	Fixed	RHSA-2020:1406, RHSA-2020:1495
Red Hat Enterprise Linux AppStream E4S (v. 8.0)	Fixed	RHSA-2020:1404, RHSA-2020:1496
Red Hat Enterprise Linux Client (v. 7)	Fixed	RHSA-2020:1420, RHSA-2020:1489
Red Hat Enterprise Linux Client Optional (v. 7)	Fixed	RHSA-2020:1420
Red Hat Enterprise Linux Desktop (v. 6)	Fixed	RHSA-2020:1429, RHSA-2020:1488
Red Hat Enterprise Linux Desktop Optional (v. 6)	Fixed	RHSA-2020:1429
Red Hat Enterprise Linux HPC Node Optional (v. 6)	Fixed	RHSA-2020:1429
Red Hat Enterprise Linux Server (v. 6)	Fixed	RHSA-2020:1429
Red Hat Enterprise Linux Server (v. 7)	Fixed	RHSA-2020:1420
Red Hat Enterprise Linux Server Optional (v. 6)	Fixed	RHSA-2020:1429, RHSA-2020:1488
Red Hat Enterprise Linux Server Optional (v. 7)	Fixed	RHSA-2020:1420, RHSA-2020:1489
Red Hat Enterprise Linux Workstation (v. 6)	Fixed	RHSA-2020:1429, RHSA-2020:1488
Red Hat Enterprise Linux Workstation (v. 7)	Fixed	RHSA-2020:1420, RHSA-2020:1489
Red Hat Enterprise Linux Workstation Optional (v. 6)	Fixed	RHSA-2020:1429
Red Hat Enterprise Linux Workstation Optional (v. 7)	Fixed	RHSA-2020:1420

Timeline

2026-10-02 Threatist record created from CVE-2020-6822
2026-10-03 Alias added: GHSA-v2mh-4gcf-6ghr

References

Advisory 4

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1544181

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