CVE-2025-49709CWE-787

CVE-2025-49709

Critical · published June 11, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
51.0
In the wild
Unconfirmed
What it is

🔥 A crafty canvas operation could cause your Firefox to trip over its own memory! Think of it like a waiter accidentally mixing up orders in a busy restaurant — a misplaced dish can create chaos in the kitchen. Here, certain graphics operations can lead to memory corruption, throwing your browser's performance out the window. If exploited, this vulnerability could allow attackers to corrupt memory and potentially run malicious code, compromising your entire browsing experience. Imagine your browser crashing just when you need it most, or worse, giving an intruder a foothold into your system!

Put simply

Think of it like a waiter accidentally mixing up orders in a busy restaurant — a misplaced dish can create chaos in the kitchen. Here, certain graphics operations can lead to memory corruption, throwing your browser's performance out the window. This critical vulnerability arises from improper handling of canvas operations, leading to potential memory corruption in Firefox. The flaw allows attackers to exploit the browser's memory management, paving the way for arbitrary code execution.

What to do

If exploited, this vulnerability could allow attackers to corrupt memory and potentially run malicious code, compromising your entire browsing experience. Imagine your browser crashing just when you need it most, or worse, giving an intruder a foothold into your system! To safeguard your browsing, update Firefox to version 139.0.4 immediately. Ensure automatic updates are enabled so you stay protected from any future vulnerabilities. Regularly check for updates to keep your browser secure! You've got this! By taking these steps, you're not just fixing a vulnerability, you're fortifying your online fortress! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00662 · 51.0th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2025-06-11T16:15Z
Affected products (1)
ProductVersionsFixed in
mozilla/firefox< 139.0.4139.0.4
References (2)
EPSS history
Timeline
  • 11 JUN 12:07Z
    Memory corruption in canvas surfaces
    cvelistv5