CVE-2025-3875

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 spoofed@example.com as the actual address. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Vendor Advisory mozilla.org Vendor Advisory mozilla.org
Affected: Mozilla Thunderbird
Affected: Mozilla Thunderbird
Published at:
Updated at:

References

Link Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=1950629 permissions required
https://www.mozilla.org/security/advisories/mfsa2025-34/ vendor advisory
https://www.mozilla.org/security/advisories/mfsa2025-35/ vendor advisory

Frequently Asked Questions

What is the severity of CVE-2025-3875?
CVE-2025-3875 has been scored as a high severity vulnerability.
How to fix CVE-2025-3875?
To fix CVE-2025-3875, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-3875 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-3875 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-3875?
CVE-2025-3875 affects Mozilla Thunderbird, Mozilla Thunderbird.
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