CVE-2022-31739

Name: CVE-2022-31739
Creator: NVD / NIST
Published: 2022-12-22T20:15:28.587+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2022-31739 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. When downloading files on Windows, the % character was not escaped, which could have lead to a download incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

When downloading files on Windows, the % character was not escaped, which could have lead to a download incorrectly being saved to attacker-influenced paths that used variables such as %HOMEPATH% or %APPDATA%.<br>*This bug only affects Firefox for Windows. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 91.10, Firefox < 101, and Firefox ESR < 91.10.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

0.66%

46.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-73

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=1765049Issue 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=1765049Issue 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-2022-31739?

How severe is CVE-2022-31739?

CVE-2022-31739 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2022-31739?

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-2022-31739?

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

Scan your code now

Source: NVD / NIST