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CVE-2026-6643

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

Published: Apr 20, 2026Updated: Apr 22, 2026 Sources: CVE List NVDCWE-121
9.9CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 61.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

Description

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 summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-121

Affected Products

ASUSTOR Inc.
commercial·TWaka adm, asustor data master (adm)
ADMEmbedded
Hardware Firmware / storage-nas
asustor
commercial·TWaka as6202t firmware, adm, asustor adm
data masterEmbeddedFirmware
Hardware Firmware / storage-nas

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

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