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CVE-2025-66453— Rhino vulnerable high CPU usage and potential DoS when passing specific numbers to toFixed() function

Quick assessment

Affected
mozilla rhino
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 Rhino是美国Mozilla公司的一个开源的JavaScript引擎。 Mozilla Rhino 1.8.1版本、1.7.15.1版本和1.7.14.1版本之前版本存在资源管理错误漏洞，该漏洞源于toFixed函数处理浮点数不当，可能导致拒绝服务攻击。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.27% · P18

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2025-66453

Vulnerability Information
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Vulnerability Title
Rhino vulnerable high CPU usage and potential DoS when passing specific numbers to toFixed() function
Source: CVE Program / CVE List V5
Vulnerability Description
Rhino is an open-source implementation of JavaScript written entirely in Java. Prior to 1.8.1, 1.7.15.1, and 1.7.14.1, when an application passed an attacker controlled float poing number into the toFixed() function, it might lead to high CPU consumption and a potential Denial of Service. Small numbers go through this call stack: NativeNumber.numTo > DToA.JS_dtostr > DToA.JS_dtoa > DToA.pow5mult where pow5mult attempts to raise 5 to a ridiculous power. This vulnerability is fixed in 1.8.1, 1.7.15.1, and 1.7.14.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Rhino 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Rhino是美国Mozilla公司的一个开源的JavaScript引擎。 Mozilla Rhino 1.8.1版本、1.7.15.1版本和1.7.14.1版本之前版本存在资源管理错误漏洞，该漏洞源于toFixed函数处理浮点数不当，可能导致拒绝服务攻击。
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 rhino >= 1.8.0, < 1.8.1 -

II. Public POCs for CVE-2025-66453

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III. Intelligence Information for CVE-2025-66453

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IV. Related Vulnerabilities

Same vendor: mozilla
Same weakness: CWE-400

V. Comments for CVE-2025-66453

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