CVE-2025-40538
Browser vulnerability - Firefox
Medium
CVSS Score: 5.9
Published: 2026-01-14
Description
A denial of service vulnerability in Firefox Browser allows attackers to execute arbitrary code. This affects versions prior to 14.5.4.
Affected Systems
| Vendor | Firefox |
| Product | Browser |
| Affected Versions | < 6.71 |
| CWE ID | CWE-125 |
Mitigation
As a workaround, use Web Application Firewall until a patch is available.
Fix Instructions
1. Update Browser to the latest version
2. Apply vendor patch when available
3. Implement network segmentation
4. Monitor for exploitation attempts
References
Risk Assessment
CVSS: 5.9/10
| Exploit Available | Yes |
| Patch Available | Yes |
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