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CVE Record

CVE-2021-37193: A vulnerability has been identified in SINEMA Remote Connect Server (All versions < V3.0 SP2).

A vulnerability has been identified in SINEMA Remote Connect Server (All versions < V3.0 SP2). An unauthenticated attacker in the same network of the affected system could manipulate certain parameters and set a valid user of the affected software as invalid (or vice-versa).

MediumCVSS 4.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

SINEMA Remote Connect Server before V3.0 SP2 can let an unauthenticated attacker on the same network change whether a legitimate user is treated as valid or invalid. This is not described as remote internet exploitation, but it can disrupt access control in an operational remote-connect system.

Executive priority

Treat as a controlled but real OT access-control risk. Prioritize remediation where SINEMA Remote Connect supports production remote access or is reachable from broad internal networks.

Technical view

CVE-2021-37193 affects Siemens SINEMA Remote Connect Server versions before V3.0 SP2. The issue is mapped to CWE-471 and has CVSS 3.1 score 4.3, with adjacent-network access, low complexity, no privileges, no user interaction, and low integrity impact.

Likely exposure

Exposure is likely limited to organizations running SINEMA Remote Connect Server below V3.0 SP2 where an attacker can reach the affected system from the same or adjacent network.

Exploitation context

The provided sources do not state active exploitation, and the bundle marks it as not KEV. The attacker must be unauthenticated but positioned on the same network, reducing broad internet risk while still mattering in OT environments.

Researcher notes

Evidence is limited to the CVE record and Siemens advisory reference in the bundle. The sources identify impact and affected versions, but do not provide exploit details or independent exploitation confirmation.

Mitigation direction

  • Upgrade SINEMA Remote Connect Server to V3.0 SP2 or later per Siemens guidance.
  • Restrict network access to the SINEMA Remote Connect Server management and service interfaces.
  • Review Siemens advisory SSA-334944 for product-specific remediation guidance.
  • Monitor user-validity changes and unexpected account status modifications.

Validation and detection

  • Inventory SINEMA Remote Connect Server instances and record installed versions.
  • Confirm whether any instance runs a version earlier than V3.0 SP2.
  • Review network paths that allow same-network access to affected systems.
  • Check logs for unexplained user status changes around remote-connect administration.
Prepared
Confidence
high
Sources
3

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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 · low confidence lookup

CWE-471: 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 lookup
cve · low confidence lookup

CVE-2021-37193 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
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:N/I:L/A:N

Official CVE source material

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.

1CVSS vectors
0Timeline events
0ADP providers
2Source links

CVSS vector scores

1 official score

We 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.

ScoreVersionSeverityVectorExploitImpactSource
4.3CVSS 3.1MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N2.81.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

4.3Medium
CVSS 3.1 vector shape for CVE-2021-37193Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
SiemensSINEMA Remote Connect ServerAll versions < V3.0 SP2Listed
Weakness

CWE details

CWE-471

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-471 · source CWE mapping

Modification of Assumed-Immutable Data (MAID)

Modification of Assumed-Immutable Data (MAID) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs