Denial of Service Vulnerability in Mozilla Rhino JavaScript Engine
CVE-2025-66453

5.5MEDIUM

Key Information:

Vendor

Mozilla
Status
Rhino
Vendor
CVE Published:
3 December 2025

What is CVE-2025-66453?

The Rhino JavaScript engine is susceptible to a Denial of Service vulnerability where an attacker can exploit the toFixed() function by passing a maliciously crafted floating-point number. This could result in excessive CPU usage, rendering applications unresponsive. The issue arises from a flawed call stack that leads to computationally intensive tasks when processing small numbers. The vulnerability has been addressed in versions 1.8.1, 1.7.15.1, and 1.7.14.1, ensuring better performance and security.

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Affected Version(s)

rhino >= 1.8.0, < 1.8.1 < 1.8.0, 1.8.1

rhino >= 1.7.15, < 1.7.15.1 < 1.7.15, 1.7.15.1

rhino < 1.7.14.1 < 1.7.14.1

References

https://github.com/mozilla/rhino/security/advisories/GHSA...
x_refsource_CONFIRM

CVSS V4

Score:
5.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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