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CVE Record

CVE-2023-37524: HCL Traveler for Microsoft Outlook (HTMO) is susceptible to vulnerabilities due to .NET Framework 4.5 being out of service

HCL Traveler for Microsoft Outlook (HTMO) is susceptible to vulnerabilities due to .NET Framework 4.5 being out of service.  Since .NET Framework 4.5 has reached end-of-life and no longer receives security updates, it may expose the application to publicly known security weaknesses through vulnerable third-party components.

HighCVSS 7.7Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

This CVE affects HCL Traveler for Microsoft Outlook versions before 3.0.6 because the product relies on .NET Framework 4.5, which is end-of-life and no longer receives security updates. The business risk is inherited exposure to known weaknesses in unsupported components, not a source-described remote attack path.

Executive priority

Treat this as a high-priority hygiene and lifecycle issue for HTMO users. It is not source-confirmed as actively exploited, but unsupported framework dependencies can leave business endpoints exposed to known weaknesses that will not receive upstream security fixes.

Technical view

CWE-1104 issue: HTMO <3.0.6 uses an unsupported third-party component, .NET Framework 4.5. CVSS 3.1 is 7.7 with local attack vector, high complexity, no privileges, required user interaction, changed scope, and high confidentiality, integrity, and availability impact.

Likely exposure

Exposure is likely limited to organizations running HCL Traveler for Microsoft Outlook clients below version 3.0.6. The bundle provides no CPEs, deployment footprint, or server-side exposure details, so validation should focus on endpoint software inventory and HTMO version reporting.

Exploitation context

The source bundle does not report active exploitation, and the CVE is not listed as KEV. The CVSS vector indicates local access and user interaction are required. Sources do not describe exploit mechanics, public exploit availability, or observed attacks.

Researcher notes

The vulnerability is framed as CWE-1104 use of an unmaintained third-party component, not a fully described standalone exploit primitive. The affected range is HTMO <3.0.6, default status unaffected. Evidence is incomplete on exact vulnerable code paths, exploitability details, and vendor remediation beyond the affected-version boundary.

Mitigation direction

  • Upgrade HTMO clients to version 3.0.6 or later following HCL guidance.
  • Review HCL KB0131418 for vendor-supported remediation details.
  • Remove or retire HTMO versions older than 3.0.6 where upgrade is unavailable.
  • Track exceptions for affected endpoints until remediation is complete.

Validation and detection

  • Inventory endpoints for HCL Traveler for Microsoft Outlook installations.
  • Confirm installed HTMO versions are 3.0.6 or later.
  • Identify systems still using .NET Framework 4.5 with HTMO.
  • Check vulnerability management records for CVE-2023-37524 coverage.
  • Verify remediation evidence through software deployment or endpoint management logs.
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

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-1104: 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.

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cve · low confidence lookup

CVE-2023-37524 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
High
CVSS
7.7 (3.1)
Known Exploited
No
Published

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

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
3Timeline events
1ADP providers
2Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

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
7.7CVSS 3.1HighCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H16HCL

Vulnerability scoring details

Base CVSS 3.1 score

7.7High
CVSS 3.1 vector shape for CVE-2023-37524Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

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

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
HCLSoftwareTraveler for Microsoft Outlook<3.0.6unaffected
Weakness

CWE details

CWE-1104

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