CVE-2025-4089

Name: CVE-2025-4089
Creator: NVD / NIST
Published: 2025-04-29T14:15:35.537+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.1/10EPSS 0.15%

Last modified Jun 17, 2026

CVE-2025-4089 is a medium-severity vulnerability rated 5.1/10 on the CVSS scale. Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability was fixed in Firefox 138 and Thunderbird 138.. EPSS estimates a 0.15% chance of exploitation in the next 30 days.

Description

Due to insufficient escaping of special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This vulnerability was fixed in Firefox 138 and Thunderbird 138.

Metrics

CVSS 3.1

5.1/10

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

EPSS Probability

0.15%

4.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 138.0
Mozilla	Thunderbird	< 138.0

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1949994%2C1956698%2C1960198Broken Link
https://www.mozilla.org/security/advisories/mfsa2025-28/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-31/Vendor Advisory

Timeline

Published: Apr 29, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-4089?

How severe is CVE-2025-4089?

CVE-2025-4089 has a CVSS score of 5.1/10 (MEDIUM severity). The EPSS model estimates a 0.15% probability of exploitation in the next 30 days.

How do I fix CVE-2025-4089?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-4089?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST