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CVE-2021-38509

Date: December 8, 2021

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.

Severity Score

Related Resources (16)

https://people.canonical.com/~ubuntu-security/cve/CVE-2021-38509
https://security.gentoo.org/glsa/202208-14
https://www.debian.org/security/2021/dsa-5026
https://www.mozilla.org/security/advisories/mfsa2021-48/
https://security.gentoo.org/glsa/202202-03
https://www.mozilla.org/security/advisories/mfsa2021-49/
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
https://www.mozilla.org/security/advisories/mfsa2021-50/
https://access.redhat.com/security/cve/CVE-2021-38509
https://bugzilla.mozilla.org/show_bug.cgi?id=1718571
https://security-tracker.debian.org/tracker/CVE-2021-38509
https://nvd.nist.gov/vuln/detail/CVE-2021-38509
https://www.debian.org/security/2022/dsa-5034
https://security.alpinelinux.org/vuln/CVE-2021-38509
https://www.mend.io/vulnerability-database/CVE-2021-38509

Severity Score

Weakness Type (CWE)

Improper Restriction of Rendered UI Layers or Frames

CWE-1021

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): LOW
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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