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CVE-2021-23997

Date: June 24, 2021

Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.

Severity Score

Related Resources (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=1701942
https://nvd.nist.gov/vuln/detail/CVE-2021-23997
https://www.mozilla.org/security/advisories/mfsa2021-16/
https://security.alpinelinux.org/vuln/CVE-2021-23997
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23997
https://www.mend.io/vulnerability-database/CVE-2021-23997

Severity Score

Weakness Type (CWE)

Incorrect Conversion between Numeric Types

CWE-681

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): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

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

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