CVE-2021-38492

Severity Score

6.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

When delegating navigations to the operating system, Firefox would accept the `mk` scheme which might allow attackers to launch pages and execute scripts in Internet Explorer in unprivileged mode. *This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Firefox < 92, Thunderbird < 91.1, Thunderbird < 78.14, Firefox ESR < 78.14, and Firefox ESR < 91.1.

Cuando se delegaba la navegación al sistema operativo, Firefox aceptaba el esquema "mk" que podía permitir a atacantes lanzar páginas y ejecutar scripts en Internet Explorer en modo no privilegiado. *Este bug sólo afecta a Firefox para Windows. Los demás sistemas operativos no están afectados*. Esta vulnerabilidad afecta a Firefox versiones anteriores a 92, Thunderbird versiones anteriores a 91.1, Thunderbird versiones anteriores a 78.14, Firefox ESR versiones anteriores a 78.14 y Firefox ESR versiones anteriores a 91.1

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Attack Vector

Network

Attack Complexity

Medium

Authentication

None

Confidentiality

None

Integrity

Partial

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-08-10 CVE Reserved
2021-11-03 CVE Published
2024-07-19 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (7)

URL	Tag	Source

URL	Date	SRC
https://bugzilla.mozilla.org/show_bug.cgi?id=1721107	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202208-14	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-38	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-39	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-40	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-41	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-42	2022-12-09

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"	< 92.0 Search vendor "Mozilla" for product "Firefox" and version " < 92.0"	-	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"	< 78.14 Search vendor "Mozilla" for product "Firefox Esr" and version " < 78.14"	-	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"	>= 91.0 < 91.1 Search vendor "Mozilla" for product "Firefox Esr" and version " >= 91.0 < 91.1"	-	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"	< 78.14 Search vendor "Mozilla" for product "Thunderbird" and version " < 78.14"	-	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"	>= 91.0 < 91.1 Search vendor "Mozilla" for product "Thunderbird" and version " >= 91.0 < 91.1"	-	Affected	in	Microsoft Search vendor "Microsoft"	Windows Search vendor "Microsoft" for product "Windows"	-	-	Safe