CVE-2025-3875
thunderbird - security update
7.5
HIGH
CVSS 3.1
EPSS 0.38%
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 was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.
How to fix CVE-2025-3875
To remediate CVE-2025-3875, upgrade the affected package to a fixed version below.
- —upgrade to 1:128.10.1esr-1~deb11u1 or later
- —upgrade to 1:128.10.1esr-1~deb12u1 or later
Is CVE-2025-3875 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1:128.10.1esr-1~deb11u1
- from 0, < 1:128.10.1esr-1~deb12u1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |