How severe is CVE-2025-66421?

CVE-2025-66421 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2025-66421 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66421?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-66421 have an EU (EUVD) identifier?

Yes. CVE-2025-66421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199920.

When was CVE-2025-66421 published?

CVE-2025-66421 was published on 2025-11-30 and last updated on 2026-06-17.

CVE-2025-66421

CVE-2025-66421 is a medium-severity vulnerability with a CVSS 3.x base score of 5.4. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 5.4)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-199920
Weakness: CWE-79
Published: 2025-11-30
Last modified: 2026-06-17

Description

Tryton sao (aka tryton-sao) before 7.6.11 allows XSS because it does not escape completion values. This is fixed in 7.6.11, 7.4.21, 7.0.40, and 6.0.69.

Frequently asked questions

What is CVE-2025-66421?: Tryton sao (aka tryton-sao) before 7.6.11 allows XSS because it does not escape completion values. This is fixed in 7.6.11, 7.4.21, 7.0.40, and 6.0.69.
How severe is CVE-2025-66421?: CVE-2025-66421 has a CVSS 3.x base score of 5.4, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2025-66421 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-66421?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-66421 have an EU (EUVD) identifier?: Yes. CVE-2025-66421 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-199920.
When was CVE-2025-66421 published?: CVE-2025-66421 was published on 2025-11-30 and last updated on 2026-06-17.

References

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