CVE-2025-3875

7.5 highEPSS 0.4%

High (7.5) in mozilla thunderbird. EPSS 0.4% chance of exploitation in the next 30 days.

Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address to be used. For example, if the From header contains an (invalid) value "Spoofed Name ", Thunderbird treats spoofed@example.com as the actual address. This vulnerability was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

Severity

CVSS 3.1

7.5 high

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 33% of CVEs (scores of 2026-10-31)
CWE: CWE-290
Published: 2025-05-14
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:thunderbird

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1950629
https://www.mozilla.org/security/advisories/mfsa2025-34/
https://www.mozilla.org/security/advisories/mfsa2025-35/
https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

Check your stack JSON