Security readout for executives and security teams
Plain-English summary
CVE-2021-47864 affects OSAS Traverse Extension 11 x86 on Windows. A service installed with a path formatting mistake may let a local attacker with limited access run code as LocalSystem. That is serious because it can turn a foothold on an affected workstation or server into full system control.
Executive priority
Treat as high priority for any environment using this legacy product. The vulnerability is not remotely exploitable by itself, but it can materially increase damage from an insider, compromised account, or malware already present on a host.
Technical view
The TravExtensionHostSvc service runs as LocalSystem and has an unquoted service path, classified as CWE-428. The reported CVSS v4.0 score is 8.5. Exploitation requires local access and low privileges, with no user interaction. Sources identify OSAS Traverse Extension 11 x86 as affected.
Likely exposure
Exposure is likely limited to environments still running OSAS Traverse Extension 11 x86. The issue is local-only, so internet exposure is not the primary concern. Systems with multiple local users, weak endpoint controls, or existing malware footholds face greater risk.
Exploitation context
The source bundle includes an ExploitDB reference, indicating public exploit information exists. It does not show confirmed active exploitation, and the CVE is not marked as CISA KEV. Exploitation depends on local ability to place files in relevant service path locations.
Researcher notes
Evidence is limited to CVE data, VulnCheck, ExploitDB, and an archived vendor homepage. No vendor patch advisory is included in the provided sources. Avoid assuming broader versions or current vendor support without additional confirmation.
Mitigation direction
- Inventory systems for OSAS Traverse Extension 11 x86.
- Check OSAS or trusted advisory sources for vendor remediation guidance.
- Remove or disable the software where it is not business-required.
- Restrict local write access around the service installation path.
- Prioritize endpoint monitoring on affected systems until remediated.
Validation and detection
- Confirm whether OSAS Traverse Extension 11 x86 is installed.
- Review the TravExtensionHostSvc service configuration for an unquoted executable path.
- Verify the service runs with LocalSystem privileges.
- Check access controls on directories in the service path.
- Document affected hosts and remediation status.
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 lookupCVE-2021-47864 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.
CVSS vector scores
1 official scoreWe 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——Primary CVE scoreVulnerability 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
Source materials
- CVE List V5 sourceCVE List V5
- ExploitDB-49698CVE reference · exploit
- Archived Vendor HomepageCVE reference · product
- VulnCheck Advisory: OSAS Traverse Extension 11 - 'travextensionhostsvc' Unquoted Service PathCVE reference · 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.