Security readout for executives and security teams
Plain-English summary
This flaw lets someone already on the relevant network make a Circutor SGE-PLC1000 act as though they are an authenticated user. The issue is high severity because successful abuse can affect confidentiality, integrity, and availability, but the cited sources limit exposure to firmware 0.9.2b and require network proximity.
Executive priority
Treat this as high priority if SGE-PLC1000 devices are deployed in operational environments. The business concern is unauthorized control or changes from inside the network, not broad internet-scale exploitation based on the provided evidence.
Technical view
CVE-2021-33842 is an improper authentication issue in the cookie parameter of Circutor SGE-PLC1000 firmware 0.9.2b. The CVSS 3.1 score is 8.8 with adjacent-network attack vector, low complexity, no privileges, no user interaction, and high CIA impact. The assigned weakness is CWE-565.
Likely exposure
Exposure appears limited to Circutor SGE-PLC1000 devices running firmware 0.9.2b and reachable from the same or adjacent network. The source bundle lists other versions as unaffected by default, but asset owners should verify deployed firmware directly.
Exploitation context
The sources say exploitation requires the attacker to be within the affected device’s network. The CVE is not listed as KEV in the bundle, and no cited source here states active exploitation or public exploit use.
Researcher notes
The evidence identifies the vulnerable component as the cookie parameter but does not include patch details, exploit indicators, or affected CPEs. Keep analysis scoped to SGE-PLC1000 firmware 0.9.2b unless vendor guidance expands coverage.
Mitigation direction
- Check current Circutor or INCIBE guidance for supported firmware or remediation.
- Restrict SGE-PLC1000 access to trusted management networks only.
- Block untrusted adjacent-network paths to affected devices.
- Monitor for unexpected authenticated operations or configuration changes.
- Prioritize remediation where devices support critical operational processes.
Validation and detection
- Inventory Circutor SGE-PLC1000 devices and record firmware versions.
- Flag any device confirmed on firmware 0.9.2b.
- Confirm whether affected devices are reachable from shared or adjacent networks.
- Review authentication/session controls without performing exploit attempts.
- Check operational logs for suspicious authenticated actions.
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-565: 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-2021-33842 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
- 8.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H2.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.8HighVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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-improper-authenticationCVE 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.
Reliance on Cookies without Validation and Integrity Checking
Reliance on Cookies without Validation and Integrity Checking represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.