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High · 8.6 Public exploit CVE-2026-6643 EUVD-2026-23786GHSA-46vm-f48w-xhvv

A stack-based buffer overflow vulnerability in the VPN Clients on the ADM

Published Apr 20, 2026 · Updated Apr 20, 2026 · Assigned by ASUSTOR1

Vendor: ASUSTOR Product: ADM

Description

A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protections, an authenticated remote attacker can exploit these to execute arbitrary code as the web server user.
Affected products and versions include: from ADM 4.1.0 through ADM 4.3.3.RR42 as well as from ADM 5.0.0 through ADM 5.1.2.REO1.

Affected products

VendorProductAffectedFixed
ASUSTOR ADM 4.1.0 – ≤ 4.3.3.RR42, 5.0.0 – ≤ 5.1.2.REO1 —

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 1 repository

  • mlgzackfly/CVE-2026-6643 ★ 0 · Apr 28, 2026

    ASUSTOR ADM 5.1.2 vpnupload.cgi Format String & Stack Buffer Overflow RCE (CVE-2026-6643)

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

References