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CVE-2025-3875— Sender Spoofing via Malformed From Header in Thunderbird

Quick assessment

Affected
Mozilla Thunderbird
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 128.10.1之前版本和138.0.1之前版本存在安全漏洞，该漏洞源于地址解析方式可能导致发送者欺骗。

AI Predicted 5.0 Difficulty: Easy EPSS 0.38% · P29

Possible ATT&CK Techniques 1 AI

T1566.001 · Spearphishing Attachment
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I. Basic Information for CVE-2025-3875

Vulnerability Information
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Vulnerability Title
Sender Spoofing via Malformed From Header in Thunderbird
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Thunderbird是美国Mozilla基金会的一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Thunderbird 128.10.1之前版本和138.0.1之前版本存在安全漏洞，该漏洞源于地址解析方式可能导致发送者欺骗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Thunderbird 128.10.1 ~ 128.* -

II. Public POCs for CVE-2025-3875

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III. Intelligence Information for CVE-2025-3875

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Vendor Advisories for CVE-2025-3875 (2)

Same Patch Batch · Mozilla · 2025-05-14 · 3 CVEs total

CVE-2025-3909 JavaScript Execution via Spoofed PDF Attachment and file:/// Link
CVE-2025-3932 Tracking Links in Attachments Bypassed Remote Content Blocking

IV. Related Vulnerabilities

Same product: Thunderbird
Same vendor: Mozilla

V. Comments for CVE-2025-3875

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