Security readout for executives and security teams
Plain-English summary
This flaw affects Schneider Electric Modicon controller web server/communication module functionality. A specially crafted file uploaded over FTP could corrupt data, crash the controller, or potentially allow code execution. The known score is medium, but availability impact in industrial environments can be business-significant.
Executive priority
Prioritize remediation for controllers supporting safety, production, or availability-sensitive operations, especially if FTP is broadly reachable. Without KEV listing or cited active exploitation, this is not an emergency by source evidence, but industrial downtime risk justifies tracked remediation.
Technical view
CVE-2020-7563 is a CWE-787 out-of-bounds write in the Web Server on Modicon M340, Quantum, and Premium Legacy offers and related communication modules. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:H, indicating network reachability, low attack complexity, required privileges, and high availability impact.
Likely exposure
Exposure is most likely where affected Modicon M340, Quantum, or Premium Legacy controllers or communication modules have FTP reachable from engineering workstations, operations networks, vendors, or other authenticated users. The source bundle does not provide exact firmware or module version detail.
Exploitation context
The provided sources do not state active exploitation, and CISA KEV status is false. Exploitation requires uploading a specially crafted file over FTP to the controller and has required privileges and user interaction in the CVSS vector.
Researcher notes
Evidence is limited to the CVE description, CVSS vector, and Schneider advisory reference. Do not assume specific firmware ranges, exploit maturity, or patches beyond vendor guidance. The key technical issue is memory corruption during FTP file upload to the controller.
Mitigation direction
- Review Schneider Electric advisory SEVD-2020-315-01 for exact affected modules and fixes.
- Apply vendor-provided updates or workarounds where available.
- Restrict FTP access to trusted management hosts and authenticated operators.
- Segment affected controllers from corporate and internet-reachable networks.
- Monitor controllers for unexpected FTP uploads, crashes, or data corruption.
Validation and detection
- Inventory Modicon M340, Quantum, and Premium Legacy assets and communication modules.
- Confirm whether FTP is enabled and reachable to nonessential systems.
- Map discovered assets against Schneider advisory SEVD-2020-315-01.
- Check change logs for recent file uploads to affected controllers.
- Verify remediation status through vendor-approved firmware or configuration evidence.
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-787: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-7563 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.