Security readout for executives and security teams
Plain-English summary
CVE-2021-42923 affects ShowMyPC 3606 on Windows. A malicious replacement of a DLL in the program’s temporary folder can cause attacker-controlled code to run when the application loads it. The code normally runs as the user, but could run as administrator if the user starts ShowMyPC elevated.
Executive priority
Treat this as a targeted endpoint hardening issue, not an internet-wide emergency. Prioritize systems where ShowMyPC 3606 is installed, especially administrator workstations or environments where remote support tools are broadly used.
Technical view
The issue is a DLL hijack involving %temp%\ShowMyPC\-ShowMyPC3606\wodVPN.dll. If an attacker can overwrite that file, ShowMyPC 3606 may load and execute malicious code from it. The CVE description states execution is under normal user privileges unless ShowMyPC is run as administrator.
Likely exposure
Exposure is limited to Windows systems using ShowMyPC 3606 where an attacker can write to the referenced temporary ShowMyPC path. The source bundle does not identify other affected versions, platforms, or CPEs.
Exploitation context
No CISA KEV listing is reported in the source bundle, and the provided sources do not claim active exploitation. Practical abuse appears to require the ability to place or overwrite a DLL on the target user’s system.
Researcher notes
Evidence is sparse: the CVE record and linked advisory describe the DLL overwrite condition and privilege context, but provide no CVSS score, CWE, patch version, or affected-version range beyond ShowMyPC 3606 on Windows.
Mitigation direction
- Inventory Windows endpoints for ShowMyPC 3606 usage.
- Check vendor guidance for fixed or supported versions.
- Avoid running ShowMyPC as administrator unless required.
- Monitor the ShowMyPC temporary directory for unexpected DLL changes.
- Remove ShowMyPC 3606 where there is no business need.
Validation and detection
- Confirm whether ShowMyPC 3606 is present on Windows endpoints.
- Determine whether the referenced temporary ShowMyPC path exists.
- Review endpoint telemetry for wodVPN.dll replacement or unusual creation events.
- Check whether users commonly launch ShowMyPC with administrator privileges.
- Verify any vendor-recommended update or remediation has been applied.
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
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CVE-2021-42923 mapping review
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Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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
- https://f20.be/cves/showmypc-cve-2021-42923CVE reference, mitre
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.