Cyber Resilience

CVE-2023-37524

Hcltech Traveler For Microsoft Outlook ≤ 3.0.6

Published
27 June 2026
Modified
06 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.7
Click a component to see what it means
Raw vectorCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
EPSS Score 0.0010 1.0th percentile
Risk Priority 52 floored blend · peak EPSS

Summary

CVE-2023-37524 is a high-severity Use of Unmaintained Third Party Components (CWE-1104) vulnerability in Hcltech Traveler For Microsoft Outlook. Its CVSS base score is 7.7 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Compromise Software Dependencies and Development Tools (T1195.001); ranked at the 1.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SA-22 (Unsupported System Components) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A03:2025 Software Supply Chain Failures

EU & UK References

Vulnerability Data

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…

more

security weaknesses through vulnerable third-party components.

CWE(s)
CWE-1104NVD-CWE-noinfo

Related Threats

MITRE ATT&CK Enterprise Techniques

T1195.001 Compromise Software Dependencies and Development Tools Initial Access
Adversaries may manipulate software dependencies and development tools prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
T1195 Supply Chain Compromise Initial Access
Adversaries may manipulate products or product delivery mechanisms prior to receipt by a final consumer for the purpose of data or system compromise.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-59868Same product: Hcltech Traveler For Microsoft Outlook
CVE-2026-56580Same vendor: Hcltech
CVE-2024-42190Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-30134Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-30133Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-42192Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-42191Same product: Hcltech Traveler For Microsoft Outlook
CVE-2025-55277Same vendor: Hcltech
CVE-2025-52658Same vendor: Hcltech
CVE-2026-60368Shared CWE-1104

Affected Assets

hcltech
traveler for microsoft outlook
≤ 3.0.6

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 1 hardening rule · 1 OS baseline
Validate
Prove the fix (OWASP ASVS)
  • V15.1.2

Mitigating Controls (NIST 800-53 r5) AI

SA-22 Unsupported System Components good match

SA-22 directly requires replacing components once vendor support ends, structurally preventing reliance on unmaintained third-party code.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

GV.RM-04 partial match
prevents

GV.RM-04's high-level risk-response criteria can indirectly discourage unmaintained third-party use via policy, but alone removes none of the concrete supply-chain or maintenance decisions that produce CWE-1104.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.8 Management of technical vulnerabilities mostly match
finds

A maintained asset inventory plus scheduled scanning and patching directly reduces the window during which known vulnerable third-party components remain exploitable.

A.5.21 Managing information security in the ICT supply chain partial match
prevents

Periodic validation, certification demands, and life-cycle monitoring of supplier components help surface and replace unmaintained third-party elements before they become exploitable liabilities.

A.5.6 Contact with special interest groups none match
mitigates

Regular exposure to external advisories and vulnerability disclosures helps teams identify and replace unmaintained third-party components before attackers can exploit known weaknesses in them.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

Oracle Linux 8 (1 rule)
  • V-248521 OL 8 must be a vendor-supported release. prevents CWE-1104

References