Security readout for executives and security teams
Plain-English summary
This flaw affects Circutor SGE-PLC1000 devices running firmware 0.9.2b. A remote attacker could inject operating system commands and run them with maximum privileges. For organizations using this device in operational environments, compromise could affect confidentiality, integrity, and availability of connected systems.
Executive priority
Treat this as urgent for any confirmed SGE-PLC1000 0.9.2b deployment, especially in operational technology networks. Prioritize exposure reduction and vendor remediation checks because the technical impact is complete device compromise.
Technical view
CVE-2021-33841 is a CWE-78 OS command injection in SGE-PLC1000 firmware 0.9.2b. The CVSS 3.1 score is 10.0 with network attack vector, low complexity, no privileges, no user interaction, scope changed, and high impact to confidentiality, integrity, and availability.
Likely exposure
Exposure is limited to environments running Circutor SGE-PLC1000 firmware 0.9.2b. Risk is highest if device interfaces are reachable from untrusted networks. The supplied data marks other versions as unaffected by default, but does not enumerate all deployment conditions.
Exploitation context
The sources support remote unauthenticated exploitation potential, but do not state active exploitation. The CVE is not listed as KEV in the supplied bundle. Public exploit availability is not established by the provided sources.
Researcher notes
The provided evidence identifies the affected product, firmware version, weakness class, and CVSS vector. It does not provide exploit steps, proof of exploitation, or a named patch. Avoid assuming broader Circutor product impact without vendor confirmation.
Mitigation direction
- Identify any Circutor SGE-PLC1000 devices and firmware versions.
- Check Circutor or INCIBE guidance for vendor-approved remediation.
- Remove affected devices from internet or untrusted network exposure.
- Restrict access to required management networks only.
- Monitor affected environments until remediation guidance is applied.
Validation and detection
- Confirm whether SGE-PLC1000 firmware 0.9.2b exists in inventory.
- Review network paths to device management or service interfaces.
- Check logs for unexpected administrative or system-level activity.
- Validate remediation status against vendor or INCIBE guidance.
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-78: Command execution behavior lookup
Command injection weaknesses can lead defenders to review execution techniques and command interpreter telemetry. 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 lookupCVE-2021-33841 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
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.incibe.es/en/incibe-cert/notices/aviso-sci/circutor-sge-plc1000-os-command-injectionCVE reference · x_refsource_CONFIRM
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.
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.