Security readout for executives and security teams
Plain-English summary
CVE-2026-22542 is a denial-of-service issue in EFACEC QC 60/90/120 version 8. A person already on the internal network can disrupt availability by opening two concurrent Telnet connections. The reported impact is high because it can affect system availability, but the public record does not show active exploitation or a named patch.
Executive priority
Prioritize this for environments using the affected EFACEC systems in critical operations. The issue can disrupt availability from the internal network with low complexity. Treat it as urgent for asset owners, but avoid assuming active exploitation or an available patch until vendor guidance is confirmed.
Technical view
The CVE describes CWE-400 resource consumption in the Telnet service of EFACEC QC 60/90/120 version 8. The CVSS 4.0 score is 9.2, with network attack vector, low complexity, no privileges, and high availability impact. The condition requires access to the internal network and concurrent Telnet connections.
Likely exposure
Exposure is most relevant where affected EFACEC QC 60/90/120 version 8 systems are reachable over Telnet from internal networks. Internet exposure is not stated in the source. Organizations without these models, this version, or enabled/reachable Telnet are less likely to be exposed.
Exploitation context
The source states an attacker with internal network access can cause denial of service using two concurrent Telnet connections. CISA KEV status is false in the provided data, and no cited source claims active exploitation. Public details are limited, so operational impact should be assessed in the specific deployment context.
Researcher notes
The public CVE data is sparse. Key missing items include vendor advisory details, patch status, exact affected build scope beyond version 8, and operational recovery behavior. Do not infer broader EFACEC product impact. Focus validation on Telnet reachability, version confirmation, and vendor communications.
Mitigation direction
- Identify whether EFACEC QC 60/90/120 version 8 is deployed.
- Check EFACEC or Thales guidance for updates or official mitigations.
- Review whether Telnet is required for operations.
- Restrict Telnet access to trusted management networks where feasible.
- Monitor affected systems for unexpected Telnet connection activity.
- Document compensating controls until vendor guidance is confirmed.
Validation and detection
- Inventory EFACEC QC 60/90/120 assets and firmware versions.
- Confirm whether Telnet is enabled and reachable internally.
- Review network segmentation around affected systems.
- Check logs for unusual concurrent Telnet sessions or availability events.
- Verify any vendor-recommended update or configuration change was 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
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
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-2026-22542 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
- 9.2 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA: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:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
9.2CriticalVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H
Source materials
- CVE List V5 sourceCVE List V5
- https://cds.thalesgroup.com/enCVE reference
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.