CVE-2025-14321: Use-after-free in the WebRTC: Signaling component
Use-after-free in the WebRTC: Signaling component. This vulnerability affects Firefox < 146 and Firefox ESR < 140.6.
Other sources
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.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 140.6 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 146 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 146 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 140.6 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 146 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 140.6
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-14321?
CVE-2025-14321 is classified as a high severity vulnerability.
How do I fix CVE-2025-14321?
You can fix CVE-2025-14321 by updating to Firefox version 146 or newer, or Firefox ESR version 140.6 or newer.
What components are affected by CVE-2025-14321?
CVE-2025-14321 specifically affects the WebRTC signaling component in Firefox.
What versions of Firefox are affected by CVE-2025-14321?
CVE-2025-14321 affects Firefox versions prior to 146 and Firefox ESR versions prior to 140.6.
Is CVE-2025-14321 exploitable in the wild?
Yes, CVE-2025-14321 is known to be exploitable in the wild, posing a risk to vulnerable users.