Security readout for executives and security teams
Plain-English summary
CVE-2021-37190 affects Siemens SINEMA Remote Connect Server before V3.0 SP2. An attacker on an adjacent network could obtain VPN connection information for a known user without credentials or user interaction. The documented impact is limited information disclosure, not system takeover, but exposure matters because the product supports remote connectivity into operational environments.
Executive priority
Treat this as a moderate-priority OT remote-access exposure. It is not documented as actively exploited, but VPN connection disclosure can aid follow-on intrusion planning. Prioritize remediation where the server supports sensitive operational access or is reachable beyond a tightly controlled management network.
Technical view
The flaw is CWE-200 information exposure in SINEMA Remote Connect Server < V3.0 SP2. CVSS 3.1 is 4.3: adjacent-network attack vector, low complexity, no privileges, no user interaction, unchanged scope, low confidentiality impact, and no integrity or availability impact.
Likely exposure
Organizations using SINEMA Remote Connect Server versions earlier than V3.0 SP2 are potentially exposed, especially where the server is reachable from adjacent network segments. The source bundle does not identify internet exposure requirements or specific deployment patterns.
Exploitation context
CISA KEV status is false in the provided bundle, and no cited source states active exploitation. The described prerequisite is a known user and adjacent-network access; evidence does not support claiming remote internet exploitation.
Researcher notes
The public details are limited. Available sources establish product, affected version boundary, CWE-200 classification, and CVSS vector. Do not infer credential theft, VPN tunnel compromise, or code execution from this record without additional vendor evidence.
Mitigation direction
- Identify all SINEMA Remote Connect Server deployments and record exact versions.
- Upgrade affected installations to V3.0 SP2 or later, based on the affected-version boundary.
- Review Siemens advisory SSA-334944 for vendor-specific remediation guidance.
- Restrict adjacent-network access to SINEMA Remote Connect Server where operationally possible.
- Monitor VPN connection metadata access for unusual requests involving known users.
Validation and detection
- Confirm whether any deployed SINEMA Remote Connect Server version is earlier than V3.0 SP2.
- Verify network reachability from adjacent segments to each server instance.
- Review access logs for unexpected VPN connection information lookups.
- Confirm compensating controls limit unauthenticated access paths to the server.
- Document remediation status for each affected asset.
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-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-2021-37190 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
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/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:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://cert-portal.siemens.com/productcert/pdf/ssa-334944.pdfCVE reference · 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.
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.