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CVE-2026-6643

HighPublished

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

Published: Apr 20, 2026
Updated: Apr 20, 2026
Assigning CNA: ASUSTOR1
Evidence observed: Aug 19, 2026

Primary CVSS

8.6/ 10High

nvd · CVSS 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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 probability estimate

0.5%

Low · next 30 days

Percentile: 39.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

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

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