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CVE-2025-6424— Use-after-free in FontFaceSet

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 140之前版本和Mozilla Firefox ESR 115.25之前版本、128.12之前版本存在安全漏洞，该漏洞源于FontFaceSet存在释放后重用，可能导致崩溃。

AI Predicted 5.9 Difficulty: Easy EPSS 3.21% · P87

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-6424

Vulnerability Information
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Vulnerability Title
Use-after-free in FontFaceSet
Source: CVE Program / CVE List V5
Vulnerability Description
A use-after-free in FontFaceSet resulted in a potentially exploitable crash. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox和Mozilla Firefox ESR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 140之前版本和Mozilla Firefox ESR 115.25之前版本、128.12之前版本存在安全漏洞，该漏洞源于FontFaceSet存在释放后重用，可能导致崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 115.25 ~ 115.* -
Mozilla Thunderbird 128.12 ~ 128.* -

II. Public POCs for CVE-2025-6424

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III. Intelligence Information for CVE-2025-6424

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Vendor Advisories for CVE-2025-6424 (4)

Same Patch Batch · Mozilla · 2025-06-24 · 13 CVEs total

CVE-2025-6435 Save as in Devtools could download files without sanitizing the extension
CVE-2025-6436 Memory safety bugs fixed in Firefox 140 and Thunderbird 140
CVE-2025-6432 DNS Requests leaked outside of a configured SOCKS proxy
CVE-2025-6434 HTTPS-Only exception screen lacked anti-clickjacking delay
CVE-2025-6433 WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certifica
CVE-2025-6431 The prompt in Firefox for Android that asks before opening a link in an external applicati
CVE-2025-6428 Firefox for Android opened URLs specified in a link querystring parameter
CVE-2025-6429 Incorrect parsing of URLs could have allowed embedding of youtube.com
CVE-2025-6430 Content-Disposition header ignored when a file is included in an embed or object tag
CVE-2025-6427 connect-src Content Security Policy restriction could be bypassed
CVE-2025-6426 No warning when opening executable terminal files on macOS
CVE-2025-6425 The WebCompat WebExtension shipped with Firefox exposed a persistent UUID

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-6424

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