CVE-2026-6643Public exploitNetwork attack vector

Authenticated code execution via unbounded WireGuard parsing

Published Apr 20, 2026 · Updated Apr 20, 2026

Stack-based buffer overflow in ASUSTOR ADM allows remote authenticated users to execute code through uploaded WireGuard configurations. The upload_wireguard handler in vpnupload.cgi uses unbounded sscanf("%s") conversions to copy uploaded fields into 300-byte stack buffers, then passes serialized user-controlled data directly to printf(). A valid ADM session is required; missing PIE and stack-canary protections enable code execution as the web server user in 4.1.0 through 4.3.3.RR42 and 5.0.0 through 5.1.2.REO1.

CVSS severity8.6
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in ASUSTOR ADM allows remote authenticated users to execute code through uploaded WireGuard configurations. The upload_wireguard handler in vpnupload.cgi uses unbounded sscanf("%s") conversions to copy uploaded fields into 300-byte stack buffers, then passes serialized user-controlled data directly to printf(). A valid ADM session is required; missing PIE and stack-canary protections enable code execution as the web server user in 4.1.0 through 4.3.3.RR42 and 5.0.0 through 5.1.2.REO1.

The record

CVE
CVE-2026-6643
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
ASUSTOR Inc.
Product
ASUSTOR Data Master
Classifications
CWE-121, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.1.0 <=4.3.3.RR42
  2. Affected versionversion=5.0.0 <=5.1.2.REO1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ASUSTOR Inc. · ASUSTOR Data Masterversion=4.1.0 <=4.3.3.RR42; version=5.0.0 <=5.1.2.REO1

Published CVSS scores

8.6ASUSTOR Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L
9.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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