CVE-2025-3932

Name: CVE-2025-3932
Creator: NVD / NIST
Published: 2025-05-14T17:15:48.763+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.31%

Last modified Jun 17, 2026

CVE-2025-3932 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. EPSS estimates a 0.31% chance of exploitation in the next 30 days.

Description

It was possible to craft an email that showed a tracking link as an attachment. If the user attempted to open the attachment, Thunderbird automatically accessed the link. The configuration to block remote content did not prevent that. Thunderbird has been fixed to no longer allow access to web pages listed in the X-Mozilla-External-Attachment-URL header of an email. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.31%

23.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-288

Affected Software

Vendor	Product	Versions
Mozilla	Thunderbird	< 128.10.1
Mozilla	Thunderbird	>= 129.0, < 138.0.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1960412Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-34/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-35/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

Timeline

Published: May 14, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-3932?

How severe is CVE-2025-3932?

CVE-2025-3932 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.

How do I fix CVE-2025-3932?

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-2025-3932?

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

Scan your code now

Source: NVD / NIST