Is CVE-2025-66421 in the CISA KEV catalog?

No. CVE-2025-66421 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2025-66421?

CVE-2025-66421 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2025-66421?

CVE-2025-66421 has an EPSS score of 0.14% (4th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2025-66421?

Upgrade tryton-sao on debian 12 to 6.0.28+ds1-2+deb12u2 or later.

CVE & CISA-KEV Catalog

CVE-2025-66421

MEDIUM

5.4

CVSS v3

NVD

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.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

tryton-saoDebian

Fixed in:6.0.28+ds1-2+deb12u2CVE-2025-66421

Fixed in:7.0.28+ds1-1+deb13u2CVE-2025-66421

Fixed in:7.0.40+ds1-1CVE-2025-66421

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

0.14%probability of exploitation in 30 days

4thpercentile

Low risk: more likely to be exploited than 4% of all known CVEs.

References

Other references2

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-12-01.