EIP-2026-103088

PRE-CVE

Citadel/UX 5.9/6.x - 'Username' Remote Buffer Overflow (2)

Title source: legacy

Exploitation Summary

EIP tracks 1 public exploit for EIP-2026-103088. PoCs published by Nebunu.

AI-analyzed exploit summary This exploit targets a buffer overflow vulnerability in Citadel/UX's 'USER' command handling. It uses a ret-to-libc technique to bypass the tolower() function and execute arbitrary commands, specifically adding a root user to /etc/passwd.

Description

Citadel/UX 5.9/6.x - 'Username' Remote Buffer Overflow (2)

Exploits (1)

exploitdb WORKING POC VERIFIED

by Nebunu · cremotelinux

https://www.exploit-db.com/exploits/24339

View Code ZIP pw:eip

This exploit targets a buffer overflow vulnerability in Citadel/UX's 'USER' command handling. It uses a ret-to-libc technique to bypass the tolower() function and execute arbitrary commands, specifically adding a root user to /etc/passwd.

Classification

Working Poc 90%

Attack Type

Rce

Complexity

Moderate

Reliability

Racy

Target: Citadel/UX (version not specified)

No auth needed

Prerequisites: Citadel/UX server running on port 504 · System address and return address offset supplied manually

MITRE ATT&CK

T1190 - Exploit Public-Facing Application T1203 - Exploitation for Client Execution

devstral-2 · analyzed Feb 16, 2026 Full analysis →

Details

Status pre_cve

Tracked Since Feb 18, 2026