CVE-2025-2566 Deserialization of Untrusted Data in Kaleris Navis N4
An unauthenticated attacker can execute arbitrary code on Kaleris Navis N4 servers via unsafe Java deserialization in the Ultra Light Client.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-2566?
CVE-2025-2566 is a critical unsafe deserialization vulnerability in Kaleris Navis N4, published on 24 Jun 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2025-2566?
How do I fix CVE-2025-2566?
No fix has been published for CVE-2025-2566 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2025-2566 being exploited?
There is no known exploitation of CVE-2025-2566 in the wild and no public exploit code.
Sources
Also known as GHSA-8jgr-qfg7-w699.