What is CVE-2026-6643?

CVE-2026-6643 is a vulnerability in Asustor Inc. Adm, classified under Stack-based Buffer Overflow. Published 2026-04-20.

Is CVE-2026-6643 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Asustor Inc. Adm

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 unbounded sscanf() and passing user-controlled data directly to printf(). Due to the lack of PIE and Stack Canary protecti…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (35.8th percentile) — read the EPSS interpretation.

Affected products

Asustor Inc. Adm — versions 4.1.0, 5.0.0

Weakness classification (CWE)

CWE-121 — Stack-based Buffer Overflow

Public proof-of-concept exploits

mlgzackfly/CVE-2026-6643

References

www.asustor.com/security/security_advisory_detail (vendor-advisory)

Frequently asked questions

What is CVE-2026-6643?: CVE-2026-6643 is a vulnerability in Asustor Inc. Adm, classified under Stack-based Buffer Overflow. Published 2026-04-20.
Is CVE-2026-6643 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.