Security readout for executives and security teams
Plain-English summary
OpenPLC Webserver v3 had a command injection flaw in the Hardware Layer Code Box on the /hardware page. If reachable and exploitable, an attacker could run arbitrary code on the server. This is especially concerning where OpenPLC supports lab, industrial, or operational technology environments.
Executive priority
Treat exposed OpenPLC Webserver v3 instances as urgent. The business concern is not website defacement; it is potential code execution on systems that may support automation or control functions. Prioritize network containment and vendor-guidance review.
Technical view
CVE-2021-31630 is described as command injection in OpenPLC Webserver v3 through the Hardware Layer Code Box component on /hardware. The CVE record does not provide CVSS, CWE, fixed versions, authentication requirements, or detailed affected CPEs. Packet Storm references remote code execution material, but the bundle does not prove active exploitation.
Likely exposure
Exposure is most likely where OpenPLC Webserver v3 is deployed and the /hardware administration surface is reachable by untrusted users or networks. The source bundle does not define exact affected versions beyond v3 or whether authentication is required.
Exploitation context
The provided references include public remote-code-execution material, so defenders should assume proof-of-concept knowledge exists. The CVE is not marked KEV in the bundle, and no cited source here establishes active exploitation in the wild.
Researcher notes
Evidence is thin in the CVE record: no CVSS, CWE, CPEs, fixed release, or authentication details are provided. Do not assume affected versions beyond OpenPLC Webserver v3 from the supplied sources. Validate exposure and control reachability before assigning operational risk.
Mitigation direction
- Restrict OpenPLC Webserver access to trusted management networks only.
- Check OpenPLC vendor or project guidance for fixed versions or configuration mitigations.
- Disable or tightly control access to hardware configuration features where operationally possible.
- Review deployments for unnecessary internet or broad internal exposure.
- Monitor the host for unexpected process execution or configuration changes.
Validation and detection
- Inventory systems running OpenPLC Webserver v3.
- Confirm whether /hardware is reachable from untrusted networks.
- Review access controls around hardware configuration functions.
- Check application and host logs for suspicious command execution indicators.
- Document version, exposure path, compensating controls, and remediation status.
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.
Execution 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 lookupCVE-2021-31630 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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.youtube.com/watch?v=l08DHB08GowCVE reference · x_refsource_MISC
- https://packetstormsecurity.com/files/162563/OpenPLC-WebServer-3-Remote-Code-Execution.htmlCVE reference · x_refsource_MISC
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.