Home/CVE/Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address t
CVE

CVE-2025-3875

Thunderbird parses addresses in a way that can allow sender spoofing in case the server allows an invalid From address t

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.

HIGH · CVSS 7.5 EPSS 0.00375
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-290Authentication Bypass by Spoofing
▤

Affected Products & Versions

2
mozilla thunderbird< 128.10.0
mozilla thunderbird>= 129.0 and < 138.0.1
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · security@mozilla.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD14 May 2025 · 05:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

14
usnUSN-7663-1
suse-csafSUSE-SU-2025:01660-2
rhsaRHSA-2025:8756Important
suse-csafSUSE-SU-2025:01660-1
suse-csafopenSUSE-SU-2025:15131-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.mozilla.org/show_bug.cgi?id=1950629Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-34/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-35/Vendor Advisory
https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html
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