CVE-2026-6643: A stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM. The issue stems from the use of…
CVE-2026-6643 · Severity: critical · CVSS 9.9 · Published 2026-04-20
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.
No. Junglewise Threat Intelligence has no report of CVE-2026-6643 being exploited in the wild.
How severe is CVE-2026-6643?
Critical severity, with a CVSS score of 9.9, published 20 April 2026.
Which products and versions are affected?
ASUSTOR Data Master. The advisory does not name versions.
Is there a fix for CVE-2026-6643?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-6643?
Check whether you run ASUSTOR Data Master. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.