CVE-2025-1931

Name: CVE-2025-1931
Creator: NVD / NIST
Published: 2025-03-04T14:15:37.963+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.50%

Last modified Jun 17, 2026

CVE-2025-1931 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.. EPSS estimates a 0.50% chance of exploitation in the next 30 days.

Description

It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

0.50%

38.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-416

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.21.0
Mozilla	Firefox	< 136.0
Mozilla	Firefox	>= 116.0, < 128.8.0
Mozilla	Thunderbird	< 128.8.0
Mozilla	Thunderbird	>= 129.0, < 136.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1944126Issue Tracking
https://www.mozilla.org/security/advisories/mfsa2025-14/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-15/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-16/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-17/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-18/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/03/msg00006.html

Timeline

Published: Mar 4, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-1931?

How severe is CVE-2025-1931?

CVE-2025-1931 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.50% probability of exploitation in the next 30 days.

How do I fix CVE-2025-1931?

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-2025-1931?

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

Scan your code now

Source: NVD / NIST