Service interruption via excessive floating-point exponentiation
Published Dec 3, 2025 · Updated Dec 3, 2025
Uncontrolled resource consumption in Mozilla Rhino before 1.7.14.1, 1.7.15, and 1.8.0 allows remote attackers to exhaust CPU. NativeNumber routes a tiny attacker-controlled floating-point value passed to toFixed() through DToA.pow5mult, which attempts to raise 5 to an excessively large power. Exploitation requires an application to expose Rhino evaluation to attacker-controlled numbers, and the resulting computation can stall the hosting application or service.
Summary
What happened
Uncontrolled resource consumption in Mozilla Rhino before 1.7.14.1, 1.7.15, and 1.8.0 allows remote attackers to exhaust CPU. NativeNumber routes a tiny attacker-controlled floating-point value passed to toFixed() through DToA.pow5mult, which attempts to raise 5 to an excessively large power. Exploitation requires an application to expose Rhino evaluation to attacker-controlled numbers, and the resulting computation can stall the hosting application or service.
The record
- CVE
- CVE-2025-66453
- Published
- Dec 3, 2025
- Updated
- Dec 3, 2025
- Vendor
- Mozilla
- Product
- Rhino
- Classifications
- CWE-400, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Dec 3, 2025CVE publishedPublication date reported by the CVE source.
- Dec 3, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 1.7.14.1
- Affected versionversion=>= 1.7.15, < 1.7.15.1
- Affected versionversion=>= 1.8.0, < 1.8.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream toFixed CPU-exhaustion exampleproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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