# CVE-2025-34127

## Summary

- **CVE ID:** CVE-2025-34127
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-121, CWE-94
- **Published:** Jul 16, 2025
- **Last Modified:** Apr 7, 2026

## 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.

## Affected Products

- Achat Software — Achat Chat Server (0.150)

## References

- [CNA](https://raw.githubusercontent.com/rapid7/metasploit-framework/master/modules/exploits/windows/misc/achat_bof.rb)
- [CNA](https://www.vulncheck.com/advisories/achat-seh-buffer-overflow)
- [CNA](https://www.exploit-db.com/exploits/36056)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.61%
- **EPSS Percentile:** 74.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-09._