Security readout for executives and security teams
Plain-English summary
CVE-2021-22642 is a denial-of-service issue in Ovarro TBox systems. Specially crafted invalid Modbus frames can crash affected devices, creating operational availability risk for environments that rely on these controllers.
Executive priority
Prioritize remediation for operational sites where affected TBox devices control or monitor critical processes and Modbus is reachable beyond trusted OT segments.
Technical view
The issue is uncontrolled resource consumption (CWE-400) reachable over the network with low complexity, no authentication, and no user interaction. The reported impact is availability only: crafted invalid Modbus frames can crash affected Ovarro TBox models.
Likely exposure
Exposure is most likely where affected Ovarro TBox LT2, MS-CPU32, MS-CPU32-S2, RM2, or TG2 systems have reachable Modbus services from untrusted or weakly segmented networks.
Exploitation context
The supplied bundle does not show CISA KEV listing or cited evidence of active exploitation. The CVSS vector indicates remote, unauthenticated triggering is possible, but exploit maturity is not established here.
Researcher notes
Evidence supports a network-triggered availability flaw in specified Ovarro TBox models. The bundle does not provide exploit details, firmware fix versions, or proof of active exploitation, so validation should focus on asset exposure and authoritative vendor guidance.
Mitigation direction
- Identify affected Ovarro TBox models in asset inventory.
- Review the CISA advisory and Ovarro guidance for supported fixes or mitigations.
- Reduce untrusted network reachability to TBox Modbus services.
- Prioritize segmentation and monitoring for operational technology networks.
- Do not assume a patch from this bundle alone; verify vendor guidance.
Validation and detection
- Confirm whether deployed TBox models match the affected product list.
- Map which networks can reach TBox Modbus services.
- Review device history for unexplained crashes or availability interruptions.
- Check current CISA and Ovarro advisory text before remediation planning.
- Document compensating controls where immediate vendor remediation is unavailable.
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-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-22642 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
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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:U/C:N/I:N/A:H3.93.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.cisa.gov/uscert/ics/advisories/icsa-21-054-04CVE 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.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.