Security readout for executives and security teams
Plain-English summary
Matrix42 Remote Control Host 3.20.0031 has a Windows service configuration flaw. A local user could abuse unquoted service paths to run code as SYSTEM when affected services start. This is serious for systems where users or attackers already have local access, but the sources do not show remote exploitation or known active exploitation.
Executive priority
Treat as high priority where Matrix42 Remote Control Host 3.20.0031 is deployed. This is not an internet-facing remote code execution issue, but it can turn ordinary local access into full system control on affected machines.
Technical view
The issue is CWE-428 in FastViewerRemoteService and FastViewerRemoteProxy. Their unquoted service paths can allow a low-privileged local user to place a specially named executable in a writable path and have it executed by the service startup context, resulting in SYSTEM privileges. CVSS v4.0 is 8.5, local attack vector, low complexity, privileges required.
Likely exposure
Exposure appears limited to Windows hosts running Matrix42 Remote Control Host version 3.20.0031. Risk is highest on shared workstations, jump hosts, helpdesk systems, or endpoints where non-admin users can write to relevant directories.
Exploitation context
A public ExploitDB entry is referenced, indicating public exploit information exists. The provided sources do not indicate CISA KEV listing or active exploitation. Exploitation requires local access with some privileges, then depends on service restart or system startup behavior.
Researcher notes
The CVE record is newly published in 2026 for a 2016-era ExploitDB reference. Evidence supports a local privilege escalation via unquoted Windows service paths. No official fixed version is identified in the provided sources; verify with Matrix42 before making patch assumptions.
Mitigation direction
- Identify all Matrix42 Remote Control Host installations and versions.
- Prioritize remediation for version 3.20.0031 on multi-user or high-value systems.
- Check Matrix42 guidance for supported updates or official remediation.
- Correct affected service configurations to use properly quoted executable paths.
- Restrict write permissions on service path parent directories.
- Remove or disable the software where no longer required.
Validation and detection
- Confirm whether Matrix42 Remote Control Host 3.20.0031 is installed.
- Inspect FastViewerRemoteService and FastViewerRemoteProxy service image paths.
- Verify service executable paths are quoted when containing spaces.
- Review directory ACLs for low-privileged user write access.
- Confirm remediation persists after reboot or service restart.
- Monitor for unexpected executables in service path directories.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-428: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2016-20095 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.5 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9VulnCheckVulnerability scoring details
Base CVSS 4.0 score
8.5HighVector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-39908CVE reference, VulnCheck · exploit
- Official Product HomepageCVE reference, VulnCheck · product
- VulnCheck Advisory: Matrix42 Remote Control Host 3.20.0031 Unquoted Path Privilege EscalationCVE reference, VulnCheck · third-party-advisory
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Unquoted Search Path or Element
Unquoted Search Path or Element represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.