Resource exhaustion in Mozilla Rhino
CVE-2025-66453
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.
Vulnerability class: DoS (Denial of Service)
EPSS: 0.002 (15.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Mozilla Rhino — versions 1.8.0, >= 1.8.0, < 1.8.1, < 1.7.14.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66453?
- CVE-2025-66453 is a high-severity vulnerability in Mozilla Rhino, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2025-12-03.
- How severe is CVE-2025-66453?
- High severity. CVSS v3 base score is 7.5 out of 10.