---
id: CVE-2025-4084
title: >-
  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 Firefo…
summary: >-
  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 Firefo…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-116
vendor: mozilla
product: firefox
affected:
  - firefox < 115.23
  - 'firefox >= 128.0, < 128.10'
  - thunderbird < 128.10.0
patched:
  - firefox 128.10
  - thunderbird 128.10.0
published: '2025-04-29'
updated: '2026-09-30'
sourceUpdated: '2026-09-30T18:10:00.190'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-4084'
references:
  - url: >-
      https://bugzilla.mozilla.org/buglist.cgi?bug_id=1949994%2C1956698%2C1960198
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-29/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-30/'
    label: security@mozilla.org
  - url: 'https://www.mozilla.org/security/advisories/mfsa2025-32/'
    label: security@mozilla.org
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00438
epssPercentile: 0.35717
ingestedAt: '2026-09-30T18:17:24.433Z'
---

## Overview

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

- `firefox < 115.23`
- `firefox >= 128.0, < 128.10`
- `thunderbird < 128.10.0`

## Remediation

Upgrade past the affected range:

- `firefox 128.10`
- `thunderbird 128.10.0`