CVE-2019-25601 UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow
Local attackers can crash UltraVNC Launcher by supplying an excessively long string to the Path property field, causing a denial of service.
- 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-2019-25601?
CVE-2019-25601 is a medium-severity memory corruption vulnerability in Uvnc UltraVNC Launcher, 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
UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path vncviewer.exe property field that allows local attackers to crash the application by supplying an excessively long string. Attackers can input a 300-byte payload of repeated characters through the Properties dialog to trigger a denial of service condition.
Weakness: CWE-787
Which versions are affected by CVE-2019-25601?
How do I fix CVE-2019-25601?
No fix has been published for CVE-2019-25601 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2019-25601 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2019-25601 exists.
Sources
Also known as GHSA-799g-q7g6-v2p9.