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CVE Record

CVE-2021-36724: ForeScout - SecureConnector Local Service DoS

ForeScout - SecureConnector Local Service DoS - A low privilaged user which doesn't have permissions to shutdown the secure connector service writes a large amount of characters in the installationPath. This will cause the buffer to overflow and override the stack cookie causing the service to crash.

MediumCVSS 6.1Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

A local low-privileged user can crash ForeScout SecureConnector by abusing an installation path value. This affects SecureConnector 11.0.4.1024. The business concern is endpoint security service disruption on systems where untrusted local users can interact with the affected connector.

Executive priority

Treat as a moderate operational risk. Prioritize affected shared or high-value endpoints first, because disruption of a security connector can reduce visibility or control even without confirmed remote exploitation.

Technical view

The source describes a local buffer overflow condition: excessive characters written into installationPath overwrite the stack cookie and crash the SecureConnector local service. The published CVSS is 6.1, local attack vector, low complexity, low privileges, no user interaction. The description names denial of service, while the vector lists high confidentiality and low integrity impact.

Likely exposure

Exposure appears limited to hosts running ForeScout SecureConnector 11.0.4.1024, especially shared workstations, kiosks, labs, or servers where low-privileged local users have access.

Exploitation context

The bundle does not show active exploitation, public exploit availability, or KEV listing. Attack prerequisites are local access and low privileges. Evidence is incomplete on practical exploitability beyond service crash.

Researcher notes

The record’s description emphasizes local service denial of service, but the CVSS vector includes confidentiality and integrity impacts. No CWE, patch version, exploit evidence, or detailed vendor remediation is included in the provided bundle.

Mitigation direction

  • Identify endpoints running SecureConnector 11.0.4.1024.
  • Check ForeScout or official advisory guidance for fixed versions or compensating controls.
  • Reduce unnecessary local user access on affected endpoints.
  • Review permissions around SecureConnector installation and configuration paths.
  • Monitor for unexpected SecureConnector service crashes.

Validation and detection

  • Inventory SecureConnector versions across managed endpoints.
  • Confirm whether SecureConnector 11.0.4.1024 is present.
  • Review endpoint logs for recurring SecureConnector service crashes.
  • Verify local permissions on SecureConnector installation and configuration locations.
  • Do not validate by attempting overflow-style crash testing in production.
Prepared
Confidence
medium
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

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CVE-2021-36724 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
6.1 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
6.1CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N1.84.2Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

6.1Medium
CVSS 3.1 vector shape for CVE-2021-36724Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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
ForeScouteServices / eNvoiceSecureConnector 11.0.4.1024Listed
Weakness

CWE details

No CWE listed

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