CVE-2025-14321

CRITICAL
Published Dec 9, 2025 Modified Apr 13, 2026 CWE-416

Description

Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

CVSS v3.1 Score

9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor Product
mozilla firefox
mozilla firefox
mozilla thunderbird
mozilla thunderbird

References

Frequently Asked Questions

What is CVE-2025-14321? +
Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6. It has a CVSS v3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2025-14321? +
CVE-2025-14321 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.
What products are affected by CVE-2025-14321? +
CVE-2025-14321 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2025-14321? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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