EIP-2026-103235

PRE-CVE

Valve Software Half-Life Server 1.1.1.0/3.1.1.1c1/4.1.1.1a - Multiplayer Request Buffer Overflow

Title source: legacy
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103235. PoCs published by hkvig.

AI-analyzed exploit summary This exploit targets a buffer overflow vulnerability in Half-Life servers (versions <= 1.1.1.0, 3.1.1.1c1, and 4.1.1.1a) by sending a maliciously crafted UDP packet to execute arbitrary shellcode, resulting in remote code execution (RCE). The payload includes NOP sleds and shellcode to spawn a reverse shell.

Description

Valve Software Half-Life Server 1.1.1.0/3.1.1.1c1/4.1.1.1a - Multiplayer Request Buffer Overflow

Exploits (1)

exploitdb WORKING POC VERIFIED
by hkvig · cremotelinux
https://www.exploit-db.com/exploits/22968

This exploit targets a buffer overflow vulnerability in Half-Life servers (versions <= 1.1.1.0, 3.1.1.1c1, and 4.1.1.1a) by sending a maliciously crafted UDP packet to execute arbitrary shellcode, resulting in remote code execution (RCE). The payload includes NOP sleds and shellcode to spawn a reverse shell.

Classification
Working Poc 95%
Attack Type
Rce
Complexity
Moderate
Reliability
Reliable
Target: Half-Life Server (Windows/Linux) <= 1.1.1.0, 3.1.1.1c1, 4.1.1.1a
No auth needed
Prerequisites: Network access to the target server on UDP port 27015 · Target server running a vulnerable version of Half-Life
devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve
Tracked Since Feb 18, 2026