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CVE-2021-35508: NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 allows attackers to execute a malicious binary with SYSTEM...

NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 allows attackers to execute a malicious binary with SYSTEM privileges via a low-privileged user account. To exploit this, a low-privileged user must change the service configuration or overwrite the binary service.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This CVE describes a local privilege-escalation weakness in TeraRecon AQNetClient 4.4.13. A low-privileged Windows user could cause NMSAccess32.exe to run a malicious binary with SYSTEM privileges if they can change the service configuration or overwrite the service binary.

Executive priority

Treat this as a targeted endpoint hardening and vendor-validation issue. It is serious on affected hosts because SYSTEM access can enable full machine compromise, but urgency is moderated by local access requirements and no cited active exploitation evidence.

Technical view

The source description identifies NMSAccess32.exe in TeraRecon AQNetClient 4.4.13 as allowing SYSTEM execution through service misconfiguration or writable service binary conditions. No CVSS score, CWE, complete affected-product metadata, fixed version, or vendor mitigation details are included in the supplied bundle.

Likely exposure

Exposure appears limited to Windows systems running TeraRecon AQNetClient 4.4.13. Evidence is incomplete because the affected-products section is marked n/a, so teams should confirm installed versions and vendor applicability before scoping impact.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation is described as local: the attacker needs a low-privileged account and the ability to change the service configuration or overwrite the binary.

Researcher notes

The public record is sparse. The key unresolved items are exact affected product metadata, root-cause classification, patch availability, and whether the referenced vendor file contains remediation guidance. Avoid expanding scope beyond AQNetClient 4.4.13 without vendor confirmation.

Mitigation direction

  • Check TeraRecon guidance for confirmed affected versions and available fixes.
  • Upgrade or remove affected AQNetClient installations if vendor guidance supports it.
  • Restrict local access to systems running AQNetClient.
  • Review service and binary ACLs for non-admin write permissions.
  • Monitor NMSAccess32.exe service configuration and binary integrity.

Validation and detection

  • Inventory systems for TeraRecon AQNetClient 4.4.13.
  • Confirm whether NMSAccess32.exe is installed as a Windows service.
  • Review service configuration permissions for low-privileged write access.
  • Check the service binary path for non-admin write permissions.
  • Document vendor confirmation, patch status, and compensating controls.
Prepared
Confidence
medium
Sources
4

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

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CVE-2021-35508 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
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.

0CVSS vectors
0Timeline events
0ADP providers
3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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