TI-2026-05830 Aliases CVE-2026-6643 GHSA-46vm-f48w-xhvv

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

MEDIUM 40CWE-121Published 2026-04-20 · Updated 2026-04-20

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00468 40th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
ASUSTOR	ADM	4.1.0 – 4.3.3.RR42; 5.0.0 – 5.1.2.REO1	—	No fix listed	CNA

ADM VendorASUSTOR Affected 4.1.0 – 4.3.3.RR42; 5.0.0 – 5.1.2.REO1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:o:asustor:data_master::::::::	4.1.0.rhu2 to before 4.3.3.RR42; 5.0.0.ra82 to before 5.1.2.reo1	Vulnerable	ASUSTOR

cpe:2.3:o:asustor:data_master:*:*:*:*:*:*:*:* Versions 4.1.0.rhu2 to before 4.3.3.RR42; 5.0.0.ra82 to before 5.1.2.reo1 Vulnerable ·ASUSTOR

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2026-6643
2026-10-03 Alias added: GHSA-46vm-f48w-xhvv
2026-10-25 EPSS moved to the below the 50th percentile

References

Advisory 1

https://www.asustor.com/security/security_advisory_detail?id=54

TI-2026-05831 OS command injection in ASUSTOR ADM CVSS 4.0CRITICAL 9.4
TI-2026-20121 An improper input validation vulnerability was found in ADM while joining a AD Domain. CVSS 4.0CRITICAL 9.5
TI-2018-08830 OS command injection in snmp.cgi in ASUSTOR ADM version 3.1.1 allows attackers to execute… CVSS 3.0CRITICAL 9.8
TI-2018-08834 OS command injection in group.cgi in ASUSTOR ADM version 3.1.1 allows attackers to… CVSS 3.0HIGH 8.8
TI-2018-08833 OS Command Injection in upload.cgi in ASUSTOR ADM version 3.1.1 allows attackers to… CVSS 3.0HIGH 8.8
TI-2018-08829 OS command injection in user.cgi in ASUSTOR ADM version 3.1.1 allows attackers to execute… CVSS 3.0HIGH 8.8

See all 44 →

Sources

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