CVE-2021-23960

Published on: 02/25/2021 12:00:00 AM UTC

Last Modified on: 03/23/2021 11:28:53 PM UTC

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Certain versions of Firefox from Mozilla contain the following vulnerability:

Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

  • CVE-2021-23960 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • Affected Vendor/Software: URL Logo Mozilla - Firefox version < 85
  • Affected Vendor/Software: URL Logo Mozilla - Thunderbird version < 78.7
  • Affected Vendor/Software: URL Logo Mozilla - Firefox ESR version < 78.7

CVSS3 Score: 8.8 - HIGH

Attack
Vector
Attack
Complexity
Privileges
Required
User
Interaction
NETWORK LOW NONE REQUIRED
Scope Confidentiality
Impact
Integrity
Impact
Availability
Impact
UNCHANGED HIGH HIGH HIGH

CVSS2 Score: 6.8 - MEDIUM

Access
Vector
Access
Complexity
Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact
Integrity
Impact
Availability
Impact
PARTIAL PARTIAL PARTIAL

CVE References

Description Tags Link
Access Denied Issue Tracking
Permissions Required
Vendor Advisory
bugzilla.mozilla.org
text/html
URL Logo MISC bugzilla.mozilla.org/show_bug.cgi?id=1675755
Security Vulnerabilities fixed in Firefox 85 — Mozilla Release Notes
Vendor Advisory
www.mozilla.org
text/html
URL Logo MISC www.mozilla.org/security/advisories/mfsa2021-03/
Security Vulnerabilities fixed in Firefox ESR 78.7 — Mozilla Release Notes
Vendor Advisory
www.mozilla.org
text/html
URL Logo MISC www.mozilla.org/security/advisories/mfsa2021-04/
Security Vulnerabilities fixed in Thunderbird 78.7 — Mozilla Release Notes
Vendor Advisory
www.mozilla.org
text/html
URL Logo MISC www.mozilla.org/security/advisories/mfsa2021-05/

Related QID Numbers

  • 174740 SUSE Enterprise Linux Security update for MozillaFirefox (SUSE-SU-2021:0246-1)
  • 180383 Debian Security Update for firefox-esrthunderbird (CVE-2021-23960)
  • 375430 SeaMonkey Multiple Vulnerabilities
  • 500940 Alpine Linux Security Update for firefox-esr
  • 501554 Alpine Linux Security Update for firefox
  • 501623 Alpine Linux Security Update for mozjs78
  • 502378 Alpine Linux Security Update for thunderbird
  • 750377 OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:0223-1)
  • 750378 OpenSUSE Security Update for MozillaFirefox (openSUSE-SU-2021:0222-1)
  • 750379 OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:0208-1)
  • 750380 OpenSUSE Security Update for MozillaThunderbird (openSUSE-SU-2021:0209-1)

Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationMozillaFirefoxAllAllAllAll
ApplicationMozillaFirefoxAllAllAllAll
ApplicationMozillaFirefox EsrAllAllAllAll
ApplicationMozillaFirefox EsrAllAllAllAll
ApplicationMozillaThunderbirdAllAllAllAll
ApplicationMozillaThunderbirdAllAllAllAll
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*:

Social Mentions

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