CVE-2025-34127 Achat v0.150 SEH Buffer Overflow via UDP
Remote attackers can execute arbitrary code on Achat Chat Server by sending crafted UDP packets to trigger a stack-based buffer overflow.
- 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-2025-34127?
CVE-2025-34127 is a critical memory corruption vulnerability in Achat Chat Server, published on 16 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A stack-based buffer overflow exists in Achat v0.150 in its default configuration. By sending a specially crafted message to the UDP port 9256, an attacker can overwrite the structured exception handler (SEH) due to insufficient bounds checking on user-supplied input leading to remote code execution.
Which versions are affected by CVE-2025-34127?
How do I fix CVE-2025-34127?
No fix has been published for CVE-2025-34127 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-2025-34127 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-34127 exists.
Public exploit code: 1 Metasploit module.
Sources
Also known as GHSA-pfrw-7rxm-j92h.