Is CVE-2025-3522 in the CISA KEV catalog?

No. CVE-2025-3522 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-3522?

CVE-2025-3522 has a CVSS v3 base score of 6.3 (MEDIUM).

What is the EPSS score for CVE-2025-3522?

CVE-2025-3522 has an EPSS score of 0.23% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-3522?

Upgrade thunderbird on debian 11 to 1:128.10.1esr-1~deb11u1 or later. Fixes are available for 9 affected products.

CVE & CISA-KEV Catalog

CVE-2025-3522

MEDIUM

6.3

CVSS v3

NVD

Description

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 was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.

CWE-601Open Redirect

How to fix

Remediation Available

thunderbirdDebian

Fixed in:1:128.10.1esr-1~deb11u1CVE-2025-3522

Fixed in:1:128.10.0esr-1~deb12u1CVE-2025-3522

Fixed in:1:128.10.0esr-1CVE-2025-3522

thunderbirdRocky

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

thunderbirdRed Hat / RHEL

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

thunderbird-debuginfoRed Hat / RHEL

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

thunderbird-debuginfoRocky

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

thunderbird-debugsourceRocky

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

thunderbird-debugsourceRed Hat / RHEL

Fixed in:0:128.10.0-1.el10_0RHSA-2025:7507

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_2RHSA-2025:4389

Fixed in:0:128.9.2-1.el8_10RHSA-2025:4649

Fixed in:0:128.9.2-1.el8_8RHSA-2025:4617

Fixed in:0:128.9.2-1.el8_4RHSA-2025:4654

Fixed in:0:128.9.2-1.el8_6RHSA-2025:4665

Fixed in:0:128.9.2-1.el9_4RHSA-2025:4512

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_0RHSA-2025:4514

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.10.0-1.el9_6RHSA-2025:7435

Fixed in:0:128.9.2-1.el9_2RHSA-2025:4513

Fixed in:0:128.9.2-1.el9_5RHSA-2025:4229

thunderbirdUbuntu

Fixed in:1:128.12.0+build1-0ubuntu0.22.04.1USN-7663-1

Mozilla Thunderbird (en-US)Windows application

Affected:128.9.2Fixed in:128.9.2Mozilla

Affected:129.0 137.0.2Fixed in:137.0.2Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

Exploit Intelligence

0.23%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Vendor Advisory2

Other references1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-601 (Open Redirect) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-4123	High	7.6	98%	-	Fix
CVE-2018-11784	Medium	4.3	94%	-	Fix
CVE-2021-22881	Medium	6.1	87%	-	Fix
CVE-2022-45402	Medium	6.1	82%	-	Fix
CVE-2017-1000117	High	8.8	78%	-	Fix
CVE-2019-10098	Medium	6.1	74%	-	Fix

Embed a live status badge for CVE-2025-3522

Markdown

[![CVE-2025-3522](https://tridentstack.com/cve/badge/CVE-2025-3522.svg)](https://tridentstack.com/cve/CVE-2025-3522)

HTML

<a href="https://tridentstack.com/cve/CVE-2025-3522"><img src="https://tridentstack.com/cve/badge/CVE-2025-3522.svg" alt="CVE-2025-3522"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-13.