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CVE-2025-4918— Out-of-bounds access when resolving Promise objects

Quick assessment

Affected
Mozilla Firefox
Exploitation
High exploitation probability; assess promptly
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 138.0.4之前版本存在安全漏洞，该漏洞源于JavaScript Promise对象存在越界读取或写入。

AI Predicted 8.8 Difficulty: Easy EPSS 9.46% · P95

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-4918

Vulnerability Information
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Vulnerability Title
Out-of-bounds access when resolving Promise objects
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker was able to perform an out-of-bounds read or write on a JavaScript `Promise` object. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
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 138.0.4之前版本存在安全漏洞，该漏洞源于JavaScript Promise对象存在越界读取或写入。
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 115.23.1 ~ 115.* -
Mozilla Thunderbird 128.10.2 ~ 128.* -

II. Public POCs for CVE-2025-4918

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III. Intelligence Information for CVE-2025-4918

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Vendor Advisories for CVE-2025-4918 (1)

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-4918

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