CVE-2025-3875 - CVE House
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Status published Unknown CVE-2025-3875

Sender Spoofing via Malformed From Header in Thunderbird

Vulnerability 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 was fixed in Thunderbird 128.10.1 and Thunderbird 138.0.1.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • xh4vm

References

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CVE-2025-9184
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CVE-2025-9183
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Affected Vendor

Affected Software

Thunderbird
Vulnerable Versions:
128.10.1, 138.0.1

Timeline

Official Publish: May 14th, 2025
Last Modified: April 13th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.