CVE-2019-25590 Axessh 4.2 Denial of Service via Log File Name
Local attackers can crash the Axessh SSH client by providing an excessively long string in the log file name configuration.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-25590?
CVE-2019-25590 is a medium-severity denial of service vulnerability in Labf Axessh, published on 22 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Axessh 4.2 contains a denial of service vulnerability in the logging configuration that allows local attackers to crash the application by supplying an excessively long string in the log file name field. Attackers can enable session logging, paste a buffer of 500 or more characters into the log file name parameter, and trigger a crash when establishing a telnet connection.
Weakness: CWE-1282
Which versions are affected by CVE-2019-25590?
How do I fix CVE-2019-25590?
No fix has been published for CVE-2019-25590 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2019-25590 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25590 exists.
Sources
Also known as GHSA-cmwq-378r-4xwr.