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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
NVD MITRE
9.9CVSSCRITICAL
EPSS Score
0.5%
Top 63.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch 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.

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

ADMASUSTOR Inc.
Embedded
Hardware Firmware / storage-nas
data masterasustor
EmbeddedFirmware
Hardware Firmware / storage-nas
asustor inc.commercialTWHardware Firmwareaka asustor data master (adm), adm
asustorcommercialTWHardware Firmwareaka asustor adm, as6202t firmware, adm

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
Apr 20, 2026
Last Updated
Apr 22, 2026

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