Security readout for executives and security teams
Plain-English summary
Vembu StoreGrid 4.0 installs Windows services with paths that are not safely quoted. A logged-in local attacker could abuse that configuration to gain LocalSystem privileges. This is not a remote internet exploit by itself, but it can turn a low-privilege foothold on a backup server into full host control.
Executive priority
Treat as a high-priority internal exposure issue. It is not described as remotely exploitable, but compromise of a backup server can materially affect recovery, data confidentiality, and incident containment.
Technical view
The issue is CWE-428 in the RemoteBackup and RemoteBackup_webServer Windows service path configuration. The CVSS 4.0 vector is local, low complexity, low privileges, no user interaction, with high confidentiality, integrity, and availability impact on the vulnerable host.
Likely exposure
Exposure is limited to systems running Vembu StoreGrid 4.0 on Windows with the affected services installed. Backup infrastructure is often sensitive, so even local-only privilege escalation deserves prompt inventory and remediation attention.
Exploitation context
A public ExploitDB reference exists, but the bundle does not show CISA KEV listing or confirmed active exploitation. Successful abuse requires local access and a way to influence the service execution path and service restart conditions.
Researcher notes
Sources identify Vembu StoreGrid 4.0 and two affected services, but do not provide a vendor patch version in the supplied bundle. Avoid assuming broader Vembu product impact without additional evidence.
Mitigation direction
- Identify all Vembu StoreGrid 4.0 installations, especially backup servers.
- Check Vembu guidance for a supported fix or upgrade path.
- Remove or isolate unsupported StoreGrid 4.0 systems where feasible.
- Restrict write access to service path directories pending vendor guidance.
- Monitor affected services for unexpected restarts or binary changes.
Validation and detection
- Inventory Windows services named RemoteBackup and RemoteBackup_webServer.
- Review service path quoting and installation directories under change control.
- Confirm installed StoreGrid version equals or differs from 4.0.
- Verify non-administrators cannot write to relevant service directories.
- Check security logs for suspicious local privilege escalation activity.
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 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-2016-20086 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-40582CVE reference, VulnCheck · exploit
- VulnCheck Advisory: Vembu StoreGrid 4.0 Unquoted Service 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.