CVE-2023-37524: 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

highCVSS 7.7CVE-2023-37524

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: high — CVSS 7.7
Published: 2026-06-27
Last updated: 2026-06-29
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-37524

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2023-375240.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2023-37524	coverage & exploitation status	NVD · CVE.org

Recent advisories for HCL Traveler for

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

mediumCVE-2025-59868: HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a sensitive data exposure vulnerab…nvd · 2026-06-27
mediumCVE-2024-23581: The HCL Traveler for Microsoft Outlook libraries are being flagged as potentially malicious so…nvd · 2026-06-26

CVE-2023-37524: 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

Details

Exploitation outlook

Referenced CVEs

Recent advisories for HCL Traveler for

More from NVD Recent CVEs