CVE-2022-31736

moderate-risk

Published 2022-12-22

A malicious website could have learned the size of a cross-origin resource that supported Range requests. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Do I need to act?

0.23% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (3)

Firefox

Firefox Esr

Thunderbird

Affected Vendors

Mozilla

References (8)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1735923

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-20/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-21/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-22/

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1735923

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-20/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-21/

Vendor Advisory https://www.mozilla.org/security/advisories/mfsa2022-22/

/ 100

moderate-risk

Severity 32/34 · Critical

Exploitability 1/34 · Minimal

Exposure 9/34 · Low