CVE-2022-31736

Name: CVE-2022-31736
Creator: NVD / NIST
Published: 2022-12-22T20:15:27.96+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.05%

Last modified Jun 17, 2026

CVE-2022-31736 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.05% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.05%

60.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-942

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 101
Mozilla	Firefox Esr	< 91.10
Mozilla	Thunderbird	< 91.10

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1735923Issue Tracking, Permissions Required, 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/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1735923Issue Tracking, Permissions Required, 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/Vendor Advisory

Timeline

Published: Dec 22, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-31736?

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.

How severe is CVE-2022-31736?

CVE-2022-31736 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.05% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31736?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-31736?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST