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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...
7.5
CVSS
Description
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 [email protected] as the actual address. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.
Classification
CVE ID: CVE-2025-3875
CVSS Base Severity: HIGH
CVSS Base Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Problem Types
Sender Spoofing via Malformed From Header in ThunderbirdAffected Products
Vendor: Mozilla
Product: Thunderbird
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 12.16% (scored less or equal to compared to others)
EPSS Date: 2025-06-12 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-3875https://bugzilla.mozilla.org/show_bug.cgi?id=1950629
https://www.mozilla.org/security/advisories/mfsa2025-34/
https://www.mozilla.org/security/advisories/mfsa2025-35/