CVE-2025-14321

CRITICALNVD 9.89.8—Elevated

9.8

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: 9.8
EG Score: 9.8(medium)
EPSS: 38.5%
KEV: Not listed

Published

December 9, 2025

Last Modified

April 13, 2026

Advisory Details (5)

Auto-updated May 19, 2026

No patch confirmed yet.

generic

Security Vulnerabilities fixed in Thunderbird 140.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-96/

generic

Security Vulnerabilities fixed in Thunderbird 146 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-95/

generic

Security Vulnerabilities fixed in Firefox ESR 140.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-94/

generic

Security Vulnerabilities fixed in Firefox 146 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2025-92/

generic

Access Denied

https://bugzilla.mozilla.org/show_bug.cgi?id=1992760

Patch Availability(26)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xul-ext-lightning (1:140.7.1+build1-0ubuntu0.22.04.1) @ jammy	2026-05-21	ubuntu
redhat	thunderbird-0:140.6.0-1.el10_0	2026-01-06	redhat
redhat	firefox-0:140.6.0-1.el10_0	2026-01-06	redhat
redhat	firefox-0:140.6.0-1.el9_4	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el10_1	2026-01-05	redhat
redhat	firefox-0:140.6.0-1.el7_9	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el8_4	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el9_6	2026-01-05	redhat
redhat	firefox-0:140.6.0-2.el9_6	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el9_2	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el9_4	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el8_10	2026-01-05	redhat
redhat	firefox-0:140.6.0-1.el8_2	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el8_2	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el8_6	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el9_0	2026-01-05	redhat
redhat	firefox-0:140.6.0-2.el8_4	2026-01-05	redhat
redhat	firefox-0:140.6.0-2.el8_6	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el8_8	2026-01-05	redhat
redhat	firefox-0:140.6.0-1.el9_0	2026-01-05	redhat
redhat	firefox-0:140.6.0-1.el9_2	2026-01-05	redhat
redhat	firefox-0:140.6.0-2.el8_8	2026-01-05	redhat
redhat	thunderbird-0:140.6.0-1.el9_7	2025-12-22	redhat
redhat	firefox-0:140.6.0-1.el8_10	2025-12-11	redhat
redhat	firefox-0:140.6.0-1.el9_7	2025-12-10	redhat
redhat	firefox-0:140.6.0-1.el10_1	2025-12-10	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-416Use After Free

All Vendor Advisories

(25)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 64× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-16 17:52 UTCEPSS rescore
2026-06-15 17:48 UTCEPSS rescore
2026-06-14 23:17 UTCEPSS rescore
2026-06-13 22:59 UTCEPSS rescore
2026-06-13 22:59 UTCEPSS rescore
2026-06-12 23:11 UTCEPSS rescore
2026-06-11 13:59 UTCEPSS rescore
2026-06-10 22:18 UTCEPSS rescore
2026-06-10 13:21 UTCEPSS rescore
2026-06-08 14:16 UTCEPSS rescore
2026-06-08 14:16 UTCEPSS rescore
2026-06-07 15:24 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-06 13:47 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 22:46 UTCEPSS rescore
2026-06-05 06:10 UTCEPSS rescore
2026-06-05 06:10 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-04 13:11 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-02 20:12 UTCEPSS rescore
2026-06-02 02:09 UTCOSV refresh
2026-06-01 13:51 UTCEPSS rescore
2026-06-01 13:51 UTCEPSS rescore

Show 39 more

2026-05-31 00:16 UTCEPSS rescore
2026-05-31 00:16 UTCEPSS rescore
2026-05-29 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-28 13:44 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-27 13:40 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 13:43 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-26 07:18 UTCEPSS rescore
2026-05-24 16:56 UTCEPSS rescore
2026-05-23 15:20 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-22 21:16 UTCEPSS rescore
2026-05-21 22:42 UTCEPSS rescore
2026-05-21 03:38 UTCEG score recompute
2026-05-21 03:38 UTCVendor advisory
2026-05-21 03:38 UTCGHSA enrichment
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 22:37 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-20 11:21 UTCEPSS rescore
2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 GitHub PoC). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

GitHub PoCh3raklez/CVE-2025-14321
First seen Feb 2, 2026
Open source ↗

Frequently asked(5)

What is CVE-2025-14321?

CVE-2025-14321 is a critical vulnerability published on December 9, 2025. 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.

When was CVE-2025-14321 disclosed?

CVE-2025-14321 was first published in the National Vulnerability Database on December 9, 2025, with the most recent update on April 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-14321 actively exploited?

CVE-2025-14321 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-14321?

CVE-2025-14321 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2025-14321?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-14321, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2025-14321

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CVE-2025-14321

Published

Last Modified

Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 140.6 — Mozilla

Security Vulnerabilities fixed in Thunderbird 146 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 140.6 — Mozilla

Security Vulnerabilities fixed in Firefox 146 — Mozilla

Access Denied

Patch Availability(26)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-14321?

Same vendor

Same CWE

CVE-2025-14321

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

Security Vulnerabilities fixed in Thunderbird 140.6 — Mozilla

Security Vulnerabilities fixed in Thunderbird 146 — Mozilla

Security Vulnerabilities fixed in Firefox ESR 140.6 — Mozilla

Security Vulnerabilities fixed in Firefox 146 — Mozilla

Access Denied

Patch Availability(26)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-14321?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

Advisory Details (5)

Frequently asked(5)

Related CVEs(same vendor + same CWE)