Vulnerability in Mozilla Thunderbird
CVE-2025-3875
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@exa…
EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
Affected products
- Mozilla Thunderbird — versions 128.10.1, 138.0.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org (Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2025-3875?
- CVE-2025-3875 is a high-severity vulnerability in Mozilla Thunderbird, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2025-05-14.
- How severe is CVE-2025-3875?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2025-3875 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.