Security readout for executives and security teams
Plain-English summary
Some WAGO managed switches may expose directory indexes on their web interface. An unauthenticated network user could see resource listings that should not be public. The business risk is information disclosure, not direct takeover, but exposed industrial network equipment deserves prompt review.
Executive priority
Treat this as a moderate-priority industrial network hygiene issue. It is not described as system compromise, but exposed switch management services can leak useful reconnaissance data and should be contained quickly.
Technical view
CVE-2021-20993 is CWE-200 information exposure caused by activated directory listing in multiple WAGO managed switch models. CVSS 3.1 is 5.3: network reachable, low complexity, no privileges, no user interaction, low confidentiality impact, no integrity or availability impact.
Likely exposure
Exposure is most likely where affected WAGO switch management interfaces are reachable from untrusted networks. The source lists models 0852-0303, 0852-1305, 0852-1505, 0852-1305/000-001, and 0852-1505/000-001, with versions unspecified.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. The described issue is remotely reachable and unauthenticated, but the known impact is limited to viewing directory resource indexes.
Researcher notes
Affected versions are unspecified in the provided data, and the bundle does not include concrete patch details. Focus validation on model presence, management-plane reachability, and whether unauthenticated directory listing is observable in authorized testing.
Mitigation direction
- Review the WAGO/VDE advisory for product-specific firmware or configuration guidance.
- Inventory listed WAGO switch models and confirm whether they are deployed.
- Restrict switch management interfaces to trusted administration networks only.
- Remove internet exposure for affected management interfaces where present.
- Apply vendor-supported updates or configuration changes when confirmed by WAGO guidance.
Validation and detection
- Identify deployed WAGO switch part numbers and firmware versions.
- Check whether management interfaces are reachable from untrusted networks.
- From an authorized network, verify whether directory indexes are exposed without authentication.
- Review exposed listings for sensitive operational resources or files.
- Record compensating controls if vendor remediation is unavailable.
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
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CWE-200: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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-2021-20993 mapping review
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Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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 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:N/UI:N/S:U/C:L/I:N/A:N3.91.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://cert.vde.com/en-us/advisories/vde-2021-013CVE reference · x_refsource_CONFIRM
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.
Exposure of Sensitive Information to an Unauthorized Actor
Exposure of Sensitive Information to an Unauthorized Actor represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.