CVE-2025-3029

Name: CVE-2025-3029
Creator: NVD / NIST
Published: 2025-04-01T13:15:41.29+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.3/10EPSS 0.30%

Last modified Jun 17, 2026

CVE-2025-3029 is a high-severity vulnerability rated 7.3/10 on the CVSS scale. A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.. EPSS estimates a 0.30% chance of exploitation in the next 30 days.

Description

A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack. This vulnerability was fixed in Firefox 137, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

Metrics

CVSS 3.1

7.3/10

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

EPSS Probability

0.30%

21.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-290

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 128.9.0
Mozilla	Firefox	< 137.0
Mozilla	Thunderbird	< 128.9.0
Mozilla	Thunderbird	>= 129.0, < 137.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1952213Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-20/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-22/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-23/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-24/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html

Timeline

Published: Apr 1, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-3029?

How severe is CVE-2025-3029?

CVE-2025-3029 has a CVSS score of 7.3/10 (HIGH severity). The EPSS model estimates a 0.30% probability of exploitation in the next 30 days.

How do I fix CVE-2025-3029?

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-2025-3029?

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

Scan your code now

Source: NVD / NIST