CVE-2025-3875 – Thunderbird Email Spoofing Vulnerability

The following table lists the changes that have been made to the
CVE-2025-3875 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    May. 14, 2025

    Action Type Old Value New Value
    Added 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.
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1950629
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-34/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-35/
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