What’s Vulnerable › Vulnerabilities

CVE-2025-4084: Potential local code execution in "copy as cURL" command

• Severity: medium (CVSS 5.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-29 · updated 2026-10-05
• Weakness: CWE-116

Description

Due to insufficient escaping of the 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 bug only affects Firefox for Windows. Other versions of Firefox are unaffected.*. This vulnerability was fixed in Firefox ESR 128.10, Firefox ESR 115.23, and Thunderbird 128.10.

Affected products

• Mozilla Firefox: before 115.23; from 128.0 before 128.10 — fixed in 115.23, 128.10
• Mozilla Thunderbird: before 128.10.0 — fixed in 128.10.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.23, 128.10; Mozilla Thunderbird 128.10.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/buglist.cgi?bug_id=1949994%2C1956698%2C1960198
• https://www.mozilla.org/security/advisories/mfsa2025-29/
• https://www.mozilla.org/security/advisories/mfsa2025-30/
• https://www.mozilla.org/security/advisories/mfsa2025-32/
• https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

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