RCE in Mozilla Firefox
CVE-2025-4089
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.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.1 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Mozilla Firefox — versions 138
- Mozilla Thunderbird — versions 138
Weakness classification (CWE)
References
- bugzilla.mozilla.org/buglist.cgi (Broken Link)
- www.mozilla.org/security/advisories/mfsa2025-28/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-31/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-4089?
- CVE-2025-4089 is a medium-severity vulnerability in Mozilla Firefox, classified under Command Injection. CVSS score: 5.1/10. Published 2025-04-29.
- How severe is CVE-2025-4089?
- Medium severity. CVSS v3 base score is 5.1 out of 10.