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CVE-2025-1009— Use-after-free in XSLT

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是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 135版本之前存在安全漏洞，该漏洞源于XSLT模块中的包含一个释放后重用漏洞。

AI Predicted 7.8 Difficulty: Hard EPSS 1.22% · P66

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-1009

Vulnerability Information
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Vulnerability Title
Use-after-free in XSLT
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker could have caused a use-after-free via crafted XSLT data, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 135, Firefox ESR 115.20, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 135版本之前存在安全漏洞，该漏洞源于XSLT模块中的包含一个释放后重用漏洞。
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 115.20 ~ 115.* -
Mozilla Thunderbird 128.7 ~ 128.* -

II. Public POCs for CVE-2025-1009

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III. Intelligence Information for CVE-2025-1009

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Vendor Advisories for CVE-2025-1009 (5)

Same Patch Batch · Mozilla · 2025-02-04 · 13 CVEs total

CVE-2025-1015 Unsanitized address book fields
CVE-2025-1020 Memory safety bugs fixed in Firefox 135 and Thunderbird 135
CVE-2025-1016 Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 115.20, Firefox ESR
CVE-2025-1017 Memory safety bugs fixed in Firefox 135, Thunderbird 135, Firefox ESR 128.7, and Thunderbi
CVE-2025-0510 Address of e-mail sender can be spoofed by malicious email
CVE-2025-1014 Certificate length was not properly checked
CVE-2025-1019 Fullscreen notification not properly displayed
CVE-2025-1013 Potential opening of private browsing tabs in normal browsing windows
CVE-2025-1012 Use-after-free during concurrent delazification
CVE-2025-1018 Fullscreen notification is not displayed when fullscreen is re-requested
CVE-2025-1011 A bug in WebAssembly code generation could result in a crash
CVE-2025-1010 Use-after-free in Custom Highlight

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-1009

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