CVE-2026-6643
criticalA stack-based buffer overflow vulnerability was found in the VPN Clients on the ADM.
Vendor / product: Asustor — data master
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.
CVSS
9.9
9.9 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-04-20 07:16
Modified: 2026-10-26 21:10
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-10-27 07:07 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
asustor / data_master ≥4.1.0.rhu2 <4.3.3.RR42, ≥5.0.0.ra82 <5.1.2.reo1
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://www.asustor.com/security/security_advisory_detail?id=54
References
- https://www.asustor.com/security/security_advisory_detail?id=54 security@asustor.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:07 UTC · record ↗