CVE-2025-34127

Achat v0.150 SEH Buffer Overflow via UDP

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.

Affected

Achat Software · Achat Chat Server

CVSS v4.0 VULNCHECK

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

1.88% chance of exploitation in the next 30 days, 79th percentile

Published

2025-07-16

Updated

2026-04-07

Proof-of-concept exploits (2)

• https://www.exploit-db.com/exploits/36056
• https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/win…

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/windows/misc/achat_bof.rb

References

• CVE Record
• NVD entry