Security readout for executives and security teams
Plain-English summary
This flaw affects Schneider Electric Modicon M340, Quantum, and Premium Legacy controller web server offerings and communication modules. A user with FTP upload access could submit a crafted file that causes write access and command execution on the controller. Business risk is moderate because the issue requires some access, but controller availability impact is high.
Executive priority
Prioritize review for OT sites using the affected Modicon families, especially if FTP is broadly reachable. This is not marked as actively exploited in the provided sources, but command execution and high availability impact make unmanaged exposure unacceptable for production control environments.
Technical view
CVE-2020-7564 is a CWE-120 classic buffer overflow in the web server on listed Modicon controller platforms and communication modules. The CVSS 3.1 score is 6.3 with network attack vector, low complexity, low privileges, user interaction required, low integrity impact, and high availability impact. The described trigger is a specially crafted FTP file upload.
Likely exposure
Exposure is most likely where affected Modicon controllers or communication modules have FTP/web server functions reachable from engineering, operations, or poorly segmented networks. The bundle does not identify exact firmware versions or module models beyond directing readers to Schneider Electric's notification.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The vulnerability is network-reachable, but the CVSS vector indicates low privileges and user interaction are required. Treat internet or broad internal FTP exposure as higher concern, especially in OT environments.
Researcher notes
The source bundle lacks the Schneider notification details, including exact affected versions and vendor fixes. Analysis should avoid assuming model coverage, exploit maturity, or patch availability beyond the CVE description. Validation should focus on asset matching, FTP reachability, privilege paths, and vendor advisory alignment.
Mitigation direction
- Review Schneider Electric advisory SEVD-2020-315-01 for affected versions and official remediation.
- Inventory Modicon M340, Quantum, Premium Legacy controllers, and communication modules.
- Restrict FTP and web server access to authorized engineering networks only.
- Verify whether vendor updates or configuration changes apply before changing production controllers.
- Monitor for unexpected FTP uploads or controller configuration changes.
Validation and detection
- Compare deployed controller and module versions with Schneider Electric's notification.
- Confirm FTP is not reachable from untrusted or broad enterprise networks.
- Review access controls for accounts allowed to upload files over FTP.
- Check operational logs for unusual FTP uploads or write activity.
- Document compensating controls where vendor remediation cannot be immediately 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-120: 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-2020-7564 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
- Medium
- CVSS
- 6.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H2.14.2CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
6.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/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-2020-315-01/CVE 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.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.