Security readout for executives and security teams
Plain-English summary
This issue could let an unauthenticated network attacker stop affected Mitsubishi MELSEC iQ-R PLC operations. The reported impact is severe for operations: production may halt, device state may be lost, and physical access is needed to restore the PLC.
Executive priority
Treat this as a high operational-risk issue where affected PLCs support production. Prioritize asset confirmation, network reachability reduction, and vendor-guided remediation planning over generic IT patch cycles.
Technical view
CVE-2020-16850 is described as improper input validation in Mitsubishi MELSEC iQ-R Series PLCs with firmware 49. A crafted network packet can trigger denial of service, halting the industrial process. The bundle references R04CPU and RJ71GF11-T2, but structured affected-product data is incomplete.
Likely exposure
Exposure is most likely in industrial networks using Mitsubishi MELSEC iQ-R Series PLCs with firmware 49, especially where PLC communications are reachable from broader plant, corporate, vendor, or remote-access networks.
Exploitation context
The source bundle does not show CISA KEV listing or active exploitation evidence. The described attack is unauthenticated and network-based, so reachable PLCs are the main concern. No exploit procedure is provided here.
Researcher notes
Evidence is limited in the bundle: severity, CVSS, CWE, and structured affected-product fields are incomplete. The strongest details are the public description and references to CISA and Scadafence. Avoid assuming patch status without vendor guidance.
Mitigation direction
- Check Mitsubishi and CISA guidance for confirmed fixes or mitigations.
- Inventory MELSEC iQ-R PLC firmware versions, prioritizing firmware 49.
- Restrict network access to PLCs from non-control-system zones.
- Review remote-access paths that can reach PLC networks.
- Plan recovery procedures requiring physical PLC access.
Validation and detection
- Confirm whether MELSEC iQ-R Series PLCs are present.
- Verify firmware versions against the vulnerable firmware 49 description.
- Map which networks can reach affected PLCs.
- Review logs or monitoring for unexpected PLC communication failures.
- Do not validate by sending crafted packets to production PLCs.
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.
CVE-2020-16850 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
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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 and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://blog.scadafence.com/vulnerability-in-mitsubishi-electric-melsec-iq-r-seriesCVE reference · x_refsource_MISC
- https://us-cert.cisa.gov/ics/advisories/icsa-20-282-02CVE reference · x_refsource_MISC
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.