CVE-2025-4086
Mozilla Firefox and Thunderbird File Extension Disclosure Vulnerability
Description
A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android. Other versions of Thunderbird are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138.
INFO
Published Date :
April 29, 2025, 2:15 p.m.
Last Modified :
May 2, 2025, 1:53 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
3.9
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-4086.
| URL | Resource |
|---|---|
| https://bugzilla.mozilla.org/show_bug.cgi?id=1945705 | |
| https://www.mozilla.org/security/advisories/mfsa2025-28/ | |
| https://www.mozilla.org/security/advisories/mfsa2025-31/ |
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-4086 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-4086 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 01, 2025
Action Type Old Value New Value Changed Description A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138. A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Thunderbird for Android. Other versions of Thunderbird are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 29, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-451 -
New CVE Received by [email protected]
Apr. 29, 2025
Action Type Old Value New Value Added Description A specially crafted filename containing a large number of encoded newline characters could obscure the file's extension when displayed in the download dialog. *This bug only affects Firefox for Android. Other versions of Firefox are unaffected.* This vulnerability affects Firefox < 138 and Thunderbird < 138. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1945705 Added Reference https://www.mozilla.org/security/advisories/mfsa2025-28/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-31/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-4086 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-4086
weaknesses.