Security readout for executives and security teams
Plain-English summary
CVE-2020-7567 affects Schneider Electric Modicon M221 controllers. If an attacker can capture engineering traffic between EcoStruxure Machine Expert - Basic software and the controller, and can break the encryption keys, they may recover a password hash. The source describes high potential impact but a difficult, adjacent-network scenario requiring user interaction.
Executive priority
Treat as high priority for sites running Modicon M221 controllers, especially safety or production environments. Prioritize exposure reduction and vendor-guidance review over emergency assumptions because active exploitation is not evidenced in the provided sources.
Technical view
The issue is CWE-311, missing encryption of sensitive data, in Modicon M221 all references and all versions. CVSS 3.1 is 7.1 with AV:A/AC:H/PR:N/UI:R and high confidentiality, integrity, and availability impact. The described exposure is captured engineering traffic between EcoStruxure Machine - Basic and M221 controllers after encryption keys are broken.
Likely exposure
Organizations using Modicon M221 PLCs are in scope, especially where engineering workstation traffic can be observed on shared, poorly segmented, or untrusted adjacent networks. The bundle identifies all references and all versions as affected.
Exploitation context
The bundle does not show CISA KEV listing or active exploitation. Exploitation is not described as remote over the internet; it requires captured traffic between engineering software and the controller, high attack complexity, and user interaction.
Researcher notes
Evidence is limited to the CVE bundle, Schneider Electric advisory link, and CISA advisory link. Do not infer patched versions or exploit availability from the supplied data. Key validation questions are traffic observability, engineering workstation access, and whether M221 controllers remain in production.
Mitigation direction
- Review Schneider Electric advisory SEVD-2020-315-05 for vendor guidance.
- Review CISA ICSA-20-343-04 for recommended mitigations.
- Inventory all Modicon M221 controllers and related engineering workstations.
- Limit engineering traffic to trusted, segmented operational networks.
- Restrict access to EcoStruxure Machine - Basic project and controller communications.
Validation and detection
- Identify whether Modicon M221 controllers are deployed.
- Confirm whether EcoStruxure Machine - Basic communicates with those controllers.
- Map which networks can observe engineering workstation-to-controller traffic.
- Check whether affected controllers are all versions per the advisory scope.
- Review logs for unexpected engineering sessions or adjacent-network access.
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-311: 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 lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-7567 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.
Missing Encryption of Sensitive Data
Missing Encryption of Sensitive Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.