CVE-2021-38509

Mozilla: Javascript alert box could have been spoofed onto an arbitrary domain

Severity Score

4.3

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Due to an unusual sequence of attacker-controlled events, a Javascript alert() dialog with arbitrary (although unstyled) contents could be displayed over top an uncontrolled webpage of the attacker's choosing. This vulnerability affects Firefox < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.

Debido a una secuencia inusual de eventos controlados por el atacante, un diálogo Javascript alert() con contenido arbitrario (aunque sin estilo) podría mostrarse encima de una página web no controlada de la elección del atacante. Esta vulnerabilidad afecta a Firefox versiones anteriores a 94, Thunderbird versiones anteriores a 91.3 y Firefox ESR versiones anteriores a 91.3

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

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
2024-08-04 CVE Updated
2024-10-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-1021: Improper Restriction of Rendered UI Layers or Frames

CAPEC

References (11)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html	Mailing List
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html	Mailing List

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://security.gentoo.org/glsa/202202-03	2022-12-09
https://security.gentoo.org/glsa/202208-14	2022-12-09
https://www.debian.org/security/2021/dsa-5026	2022-12-09
https://www.debian.org/security/2022/dsa-5034	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-48	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-49	2022-12-09
https://www.mozilla.org/security/advisories/mfsa2021-50	2022-12-09
https://access.redhat.com/security/cve/CVE-2021-38509	2021-11-10
https://bugzilla.redhat.com/show_bug.cgi?id=2019628	2021-11-10

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"				< 94.0 Search vendor "Mozilla" for product "Firefox" and version " < 94.0"		-		Affected
Mozilla Search vendor "Mozilla"		Firefox Esr Search vendor "Mozilla" for product "Firefox Esr"				< 91.3.0 Search vendor "Mozilla" for product "Firefox Esr" and version " < 91.3.0"		-		Affected
Mozilla Search vendor "Mozilla"		Thunderbird Search vendor "Mozilla" for product "Thunderbird"				< 91.3.0 Search vendor "Mozilla" for product "Thunderbird" and version " < 91.3.0"		-		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