How severe is CVE-2025-2566?

CVE-2025-2566 has a CVSS 4.0 base score of 9.3, rated critical severity.

Is CVE-2025-2566 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-2566?

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

Does CVE-2025-2566 have an EU (EUVD) identifier?

Yes. CVE-2025-2566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19054.

When was CVE-2025-2566 published?

CVE-2025-2566 was published on 2025-06-24 and last updated on 2026-06-17.

CVE-2025-2566

CVE-2025-2566 is a critical-severity vulnerability with a CVSS 4.0 base score of 9.3. 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-502.

Key facts

Severity: Critical (CVSS 4.0 base score 9.3)
EPSS exploit prediction: 1% (41st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-19054
Weakness: CWE-502
Published: 2025-06-24
Last modified: 2026-06-17

Description

Kaleris NAVIS N4 ULC (Ultra Light Client) contains an unsafe Java deserialization vulnerability. An unauthenticated attacker can make specially crafted requests to execute arbitrary code on the server.

Frequently asked questions

What is CVE-2025-2566?: Kaleris NAVIS N4 ULC (Ultra Light Client) contains an unsafe Java deserialization vulnerability. An unauthenticated attacker can make specially crafted requests to execute arbitrary code on the server.
How severe is CVE-2025-2566?: CVE-2025-2566 has a CVSS 4.0 base score of 9.3, rated critical severity.
Is CVE-2025-2566 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (41st percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-2566?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-2566 have an EU (EUVD) identifier?: Yes. CVE-2025-2566 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-19054.
When was CVE-2025-2566 published?: CVE-2025-2566 was published on 2025-06-24 and last updated on 2026-06-17.

References

https://www.cisa.gov/news-events/ics-advisories/icsa-25-175-01

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