CVE-2021-29964

openSUSE Security Advisory - openSUSE-SU-2021:0858-1

Severity Score

7.1

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A locally-installed hostile program could send `WM_COPYDATA` messages that Firefox would process incorrectly, leading to an out-of-bounds read. *This bug only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.11, Firefox < 89, and Firefox ESR < 78.11.

Un programa hostil instalado localmente podría enviar mensajes "WM_COPYDATA" que Firefox procesaría incorrectamente, conllevando una lectura fuera de límites. *Este bug sólo afecta a Firefox en Windows. Otros sistemas operativos no están afectados. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.11, Firefox versiones anteriores a 89 y Firefox ESR versiones anteriores a 78.11

An update that fixes two vulnerabilities is now available. This update for MozillaThunderbird fixes the following issues.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-04-01 CVE Reserved
2021-06-09 CVE Published
2024-08-03 CVE Updated
2025-11-21 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-125: Out-of-bounds Read

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.mozilla.org/security/advisories/mfsa2021-23	2021-06-30
https://www.mozilla.org/security/advisories/mfsa2021-24	2021-06-30
https://www.mozilla.org/security/advisories/mfsa2021-26	2021-06-30

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mozilla Search vendor "Mozilla"	Firefox Search vendor "Mozilla" for product "Firefox"	< 89.0 Search vendor "Mozilla" for product "Firefox" and version " < 89.0"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Mozilla Search vendor "Mozilla"	Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"	< 78.11 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.11"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe
Mozilla Search vendor "Mozilla"	Thunderbird Search vendor "Mozilla" for product "Thunderbird"	< 78.11 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.11"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe