CVE-2025-3522 Affecting thunderbird package, versions *


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.03% (8th percentile)

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  • Snyk IDSNYK-DEBIAN11-THUNDERBIRD-9712338
  • published16 Apr 2025
  • disclosed15 Apr 2025

Introduced: 15 Apr 2025

NewCVE-2025-3522  (opens in a new tab)

How to fix?

There is no fixed version for Debian:11 thunderbird.

NVD Description

Note: Versions mentioned in the description apply only to the upstream thunderbird package and not the thunderbird package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues. This vulnerability affects Thunderbird < 137.0.2 and Thunderbird < 128.9.2.

CVSS Base Scores

version 3.1