by Kastro
Paper/Archive/CVE-2026-6643

CVE-2026-6643

ASUSTOR Inc. ADM — A stack-based buffer overflow vulnerability in the VPN Clients on the ADM

EPSS 0.5%CVSS 9.9
critical.is priorityof 100
38
CVSS 9.9 (NVD)9.9 / 10 × 3029.7Not in CISA KEV+300.0EPSS percentile 40.5.405 × 208.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
ADM4.1.0 – 4.3.3.RR42–CNA
ADM5.0.0 – 5.1.2.REO1–CNA

Scores by source

NVD9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
ASUSTOR1 (CNA)8.6CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisoryasustor.com/security/security_advisory_detail?id=54