How severe is CVE-2025-66453?

CVE-2025-66453 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-66453 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66453?

CVE-2025-66453 primarily affects Mozilla Rhino. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2025-66453?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-66453 have an EU (EUVD) identifier?

Yes. CVE-2025-66453 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201013.

When was CVE-2025-66453 published?

CVE-2025-66453 was published on 2025-12-03 and last updated on 2026-06-17.

CVE-2025-66453

CVE-2025-66453 is a high-severity vulnerability in Mozilla Rhino with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 5.5
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-201013
Weakness: CWE-400
Affected product: Mozilla Rhino
Published: 2025-12-03
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2025-66453?: CVE-2025-66453 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-66453 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66453?: CVE-2025-66453 primarily affects Mozilla Rhino. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2025-66453?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-66453 have an EU (EUVD) identifier?: Yes. CVE-2025-66453 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-201013.
When was CVE-2025-66453 published?: CVE-2025-66453 was published on 2025-12-03 and last updated on 2026-06-17.

References

https://github.com/mozilla/rhino/security/advisories/GHSA-3w8q-xq97-5j7x

Affected products (3)

cpe:2.3:a:mozilla:rhino:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:rhino:1.7.15:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:rhino:1.8.0:*:*:*:*:*:*:*

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