Security readout for executives and security teams
Plain-English summary
This flaw affects Schneider Electric Modicon M221 controllers. If an attacker can capture communication between EcoStruxure Machine - Basic and the controller, weak encryption may allow key recovery, threatening confidentiality, integrity, and availability of controller operations.
Executive priority
Treat as a high-priority OT exposure issue where M221 controllers support business-critical operations. Prioritize network containment and vendor-guidance review, especially where engineering traffic traverses shared or weakly controlled networks.
Technical view
CVE-2020-7565 is a CWE-326 inadequate encryption strength issue in Modicon M221, all references and versions. The CVSS 3.1 score is 7.1, with adjacent-network attack vector, high complexity, no privileges, user interaction required, and high CIA impact.
Likely exposure
Exposure is most likely in OT environments using Modicon M221 controllers where engineering workstation-to-controller traffic can be observed by an adjacent network attacker.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation depends on captured EcoStruxure Machine - Basic to controller traffic and appears constrained by adjacent access and high complexity.
Researcher notes
Evidence supports weak encryption affecting M221 communication with EcoStruxure Machine - Basic. The bundle does not provide exploit maturity, proof-of-concept status, or a specific patch level, so remediation should be tied to Schneider and CISA advisories.
Mitigation direction
- Review Schneider Electric advisory SEVD-2020-315-05 for vendor remediation guidance.
- Review CISA ICSA-20-343-04 for operational mitigations and affected-product details.
- Restrict controller and engineering workstation network access to trusted OT hosts.
- Segment M221 controller networks from enterprise and internet-accessible networks.
- Monitor for unexpected controller communication and unauthorized configuration activity.
Validation and detection
- Inventory Modicon M221 controllers and confirm model references and firmware/software context.
- Identify systems running EcoStruxure Machine - Basic that communicate with M221 controllers.
- Confirm whether attacker-accessible networks can observe engineering workstation-to-controller traffic.
- Check whether vendor-recommended mitigations or updates have been applied.
- Review OT monitoring logs for unusual controller sessions or configuration changes.
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-326: 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-2020-7565 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
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/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.
SSVC decision data
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:H/PR:N/UI:R/S:U/C:H/I:H/A:H1.25.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://www.se.com/ww/en/download/document/SEVD-2020-315-05/CVE reference, schneider · x_refsource_MISC
- https://us-cert.cisa.gov/ics/advisories/icsa-20-343-04CVE reference, schneider · 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.
Inadequate Encryption Strength
Inadequate Encryption Strength represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.