CVE-2021-38496

Mozilla: Use-after-free in MessageTask

Severity Score

8.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

Durante las operaciones en MessageTasks, una tarea puede haber sido eliminada mientras todavía estaba programada, resultando en una corrupción de memoria y un bloqueo potencialmente explotable. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 78.15, Thunderbird versiones anteriores a 91.2, Firefox ESR versiones anteriores a 91.2, Firefox ESR versiones anteriores a 78.15 y Firefox versiones anteriores a 93

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-10 CVE Reserved
2021-10-11 CVE Published
2024-07-19 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-416: Use After Free

CAPEC

References (9)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	Mailing List
https://www.mozilla.org/security/advisories/mfsa2021-46	Broken Link

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://www.debian.org/security/2022/dsa-5034	2022-03-17
https://www.mozilla.org/security/advisories/mfsa2021-43	2022-03-17
https://www.mozilla.org/security/advisories/mfsa2021-44	2022-03-17
https://www.mozilla.org/security/advisories/mfsa2021-45	2022-03-17
https://www.mozilla.org/security/advisories/mfsa2021-47	2022-03-17
https://access.redhat.com/security/cve/CVE-2021-38496	2021-10-13
https://bugzilla.redhat.com/show_bug.cgi?id=2011097	2021-10-13

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"				< 93.0 Search vendor "Mozilla" for product "Firefox" and version " < 93.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 78.15 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.15"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				>= 91.0 < 91.2 Search vendor "Mozilla" for product "Firefox Esr" and version " >= 91.0 < 91.2"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 78.15 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.15"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				>= 91.0 < 91.2 Search vendor "Mozilla" for product "Thunderbird" and version " >= 91.0 < 91.2"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected