Security 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 0.0027 18th percentile
Risk Priority 54 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

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 Data Obfuscation (T1001); ranked at the 18th 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

T1001 Data Obfuscation Command And Control
Adversaries may obfuscate command and control traffic to make it more difficult to detect.
attack.mitre.org →
T1003.004 LSA Secrets Credential Access
Adversaries with SYSTEM access to a host may attempt to access Local Security Authority (LSA) secrets, which can contain a variety of different credential materials, such as credentials for service accounts.
attack.mitre.org →
T1003.008 /etc/passwd and /etc/shadow Credential Access
Adversaries may attempt to dump the contents of <code>/etc/passwd</code> and <code>/etc/shadow</code> to enable offline password cracking.
attack.mitre.org →
T1006 Direct Volume Access Stealth
Adversaries may directly access a volume to bypass file access controls and file system monitoring.
attack.mitre.org →
T1008 Fallback Channels Command And Control
Adversaries may use fallback or alternate communication channels if the primary channel is compromised or inaccessible in order to maintain reliable command and control and to avoid data transfer thresholds.
attack.mitre.org →
T1016 System Network Configuration Discovery Discovery
Adversaries may look for details about the network configuration and settings, such as IP and/or MAC addresses, of systems they access or through information discovery of remote systems.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-42192Same product: Hcltech Traveler For Microsoft Outlook
CVE-2026-56580Same vendor: Hcltech
CVE-2025-55277Same vendor: Hcltech
CVE-2024-42191Same product: Hcltech Traveler For Microsoft Outlook
CVE-2025-59868Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-42190Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-30133Same product: Hcltech Traveler For Microsoft Outlook
CVE-2024-30134Same product: Hcltech Traveler For Microsoft Outlook
CVE-2025-52658Same vendor: Hcltech
CVE-2025-10220Shared 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
blocks

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.5.15 Access control partial match
removes
A.5.21 Managing information security in the ICT supply chain partial match
blocks

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.8.26 Application security requirements partial match
removes
A.8.27 Secure system architecture and engineering principles partial match
removes
A.8.8 Management of technical vulnerabilities partial match
finds

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

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` (higher-evidence rows only; rows rated `none` are excluded).

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

References