CVE-2026-6644
A public proof of concept exists; no exploitation attested.
- Published2026-04-20
- Fixed in5.1.2.reo1 · 4.3.3.RR42
- WeaknessCWE-78
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A command injection vulnerability was found in the PPTP VPN Clients on the ADM. The vulnerability allows an administrative user to break out of the restricted web environment and execute arbitrary code on the underlying operating system. This occurs due to insufficient validation of user-supplied input before it is passed to a system shell. Successful exploitation allows an attacker to achieve Remote Code Execution (RCE) and fully compromise the system. 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.
Timeline
dates in UTC- 2026-04-2007:16CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-6644?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-6644?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.x | ≥ 5.0.0.ra82, < 5.1.2.reo1 | 5.1.2.reo1 | NVD |
| 4.x | ≥ 4.1.0.rhu2, < 4.3.3.RR42 | 4.3.3.RR42 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Asustor data master to 5.1.2.reo1 · 4.3.3.RR42
Advisories and patches
- httpsVendor Advisory
Detection
read 2026-10-23 19:25 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
Sources
- CISA-ADPSSVC decisionpoc2026-04-30
- OpenCVESSVC decisionpoc—
- CNACVSS 4.09.4read 2026-10-23
- NVDCVSS 3.19.1read 2026-10-23
- CNAweakness (CWE)CWE-78read 2026-10-23
- FIRST EPSSEPSS score2.1 %2026-10-22
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CVSS 4.0 vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Published
- 2026-04-20
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2026-6644?
Is CVE-2026-6644 actively exploited?
What is the CVSS score for CVE-2026-6644?
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Related vulnerabilities
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