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CVE-2025-9187— Memory safety bugs fixed in Firefox 142 and Thunderbird 142

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 Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 141版本和Mozilla Thunderbird 141版本存在安全漏洞，该漏洞源于内存损坏，可能导致执行任意代码。

AI Predicted 8.5 Difficulty: Hard EPSS 0.47% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-9187

Vulnerability Information
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Vulnerability Title
Memory safety bugs fixed in Firefox 142 and Thunderbird 142
Source: CVE Program / CVE List V5
Vulnerability Description
Memory safety bugs present in Firefox 141 and Thunderbird 141. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 142 and Thunderbird 142.
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 Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 141版本和Mozilla Thunderbird 141版本存在安全漏洞，该漏洞源于内存损坏，可能导致执行任意代码。
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 142 ~ * -
Mozilla Thunderbird 142 ~ * -

II. Public POCs for CVE-2025-9187

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III. Intelligence Information for CVE-2025-9187

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Vendor Advisories for CVE-2025-9187 (2)

Same Patch Batch · Mozilla · 2025-08-19 · 21 CVEs total

CVE-2025-8042 Sandboxed iframe could start downloads
CVE-2025-55033 Drag and drop gestures in Focus for iOS could allow JavaScript links to be executed incorr
CVE-2025-55032 Focus incorrectly ignores Content-Disposition headers for some MIME types
CVE-2025-55029 Malicious scripts could spam popups for denial of service attacks
CVE-2025-55031 Passkey phishing within Bluetooth range
CVE-2025-55028 JavaScript alerts could impede UI interaction or allow denial of service attacks
CVE-2025-55030 Content-Disposition headers incorrectly ignored for some MIME types
CVE-2025-54144 Internal Firefox open-text URL scheme allowed loading of arbitrary URLs
CVE-2025-54145 Scanning a malicious URL utilizing Firefox's open-text scheme with the QR code scanner cou
CVE-2025-54143 Sandboxed iframes could allow local downloads despite sandbox restrictions
CVE-2025-9179 Sandbox escape due to invalid pointer in the Audio/Video: GMP component
CVE-2025-8364 Address bar spoofing using an blob URI on Firefox for Android
CVE-2025-8041 Incorrect URL truncation in Firefox for Android
CVE-2025-9184 Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thun
CVE-2025-9182 Denial-of-service due to out-of-memory in the Graphics: WebRender component
CVE-2025-9183 Spoofing issue in the Address Bar component
CVE-2025-9185 Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14
CVE-2025-9186 Spoofing issue in the Address Bar component of Firefox Focus for Android
CVE-2025-9180 Same-origin policy bypass in the Graphics: Canvas2D component
CVE-2025-9181 Uninitialized memory in the JavaScript Engine component

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-9187

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