Security readout for executives and security teams
Plain-English summary
CVE-2026-1875 can make affected Mitsubishi MELSEC iQ-F FX5-EIP EtherNet/IP modules stop functioning until reset. An attacker does not need credentials if they can reach the device over the network. For industrial environments, the business risk is process disruption, downtime, and manual recovery effort.
Executive priority
Treat as a high-priority availability risk for sites using FX5-EIP modules. Prioritize asset confirmation, network exposure review, and vendor guidance. Urgency is higher for production environments where module downtime could stop operations or require manual reset.
Technical view
The issue is CWE-404, improper resource shutdown or release, in the Ethernet function of MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP versions 1.000 and prior. CVSS 4.0 is 8.7. The reported impact is high availability loss from continuous UDP traffic, requiring product reset for recovery.
Likely exposure
Exposure is likely where FX5-EIP modules version 1.000 or prior are reachable over IP networks, especially from untrusted, shared, or poorly segmented networks. Products outside the listed module/version scope are not identified as affected in the provided sources.
Exploitation context
The provided sources describe remote, unauthenticated, low-complexity denial-of-service via continuous UDP packets. CISA KEV status is false in the source bundle, and no provided source confirms active exploitation. Recovery reportedly requires a system reset of the product.
Researcher notes
No CPEs are provided in the bundle. Affected scope is limited to Mitsubishi Electric MELSEC iQ-F Series FX5-EIP EtherNet/IP Module FX5-EIP versions 1.000 and prior. Patch or firmware details are not included in the provided text; consult the cited advisories.
Mitigation direction
- Check Mitsubishi Electric PSIRT advisory 2025-021 for official remediation guidance.
- Review the CISA ICS advisory for recommended operational mitigations.
- Inventory FX5-EIP modules and identify versions 1.000 and prior.
- Reduce unnecessary network reachability to affected modules pending vendor guidance.
- Plan operational recovery procedures because reset is required after successful DoS.
Validation and detection
- Confirm whether MELSEC iQ-F FX5-EIP modules are deployed.
- Record firmware/module versions and compare against version 1.000 and prior.
- Map which networks can send UDP traffic to affected modules.
- Verify monitoring can detect device unavailability or reset events.
- Do not stress-test production devices without vendor-approved procedures.
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
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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-404: Exact CWE lookup
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Open ATT&CK lookupCVE-2026-1875 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
- 8.7 (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:N
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:N——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
8.7HighVector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.mitsubishielectric.com/psirt/vulnerability/pdf/2025-021_en.pdfCVE reference · vendor-advisory
- https://jvn.jp/vu/JVNVU93286687/CVE reference · government-resource
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-62-01CVE reference · government-resource
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 Resource Shutdown or Release
Improper Resource Shutdown or Release represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.