CVE-2026-21770 - Vulnerability Details - OpenCVE

HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required High

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00111.

Exploitation none

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

HCLSoftware

HCL Traveler for Microsoft Outlook (HTMO)

unaffected

Version	Status	Constraints
`< 3.0.16`	affected	—

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130919

History

Fri, 17 Jul 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Fri, 17 Jul 2026 05:00:00 +0000

Type	Values Removed	Values Added
Description		HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.
Title		HCL Traveler for Microsoft Outlook (HTMO) is susceptible to DLL hijacking
Weaknesses		CWE-427
References		https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130919
Metrics		cvssV3_1 `{'score': 6.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: HCL

Published: 2026-07-17T04:42:54.608Z

Updated: 2026-07-17T13:04:14.448Z

Reserved: 2026-01-05T16:07:58.367Z

Link: CVE-2026-21770

Vulnrichment

Updated: 2026-07-17T13:04:03.542Z

NVD

No data.

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-427

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21770", "assignerOrgId": "1e47fe04-f25f-42fa-b674-36de2c5e3cfc", "state": "PUBLISHED", "assignerShortName": "HCL", "dateReserved": "2026-01-05T16:07:58.367Z", "datePublished": "2026-07-17T04:42:54.608Z", "dateUpdated": "2026-07-17T13:04:14.448Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1e47fe04-f25f-42fa-b674-36de2c5e3cfc", "shortName": "HCL", "dateUpdated": "2026-07-17T04:42:54.608Z"}, "title": "HCL Traveler for Microsoft Outlook (HTMO) is susceptible to DLL hijacking", "datePublic": "2026-07-17T04:42:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-427", "description": "CWE-427 Uncontrolled Search Path Element", "type": "CWE"}]}], "affected": [{"vendor": "HCLSoftware", "product": "HCL Traveler for Microsoft Outlook (HTMO)", "versions": [{"status": "affected", "version": "< 3.0.16"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.</p>"}]}], "references": [{"url": "https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130919"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "MEDIUM", "baseScore": 6.5, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H"}}], "source": {"discovery": "UNKNOWN"}, "x_generator": {"engine": "Vulnogram 1.0.2"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-17T13:03:54.584105Z", "id": "CVE-2026-21770", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-17T13:04:14.448Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-21770", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-07-17T13:03:54.584105Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-17T13:04:03.542Z"}}], "cna": {"title": "HCL Traveler for Microsoft Outlook (HTMO) is susceptible to DLL hijacking", "source": {"discovery": "UNKNOWN"}, "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "HCLSoftware", "product": "HCL Traveler for Microsoft Outlook (HTMO)", "versions": [{"status": "affected", "version": "< 3.0.16"}], "defaultStatus": "unaffected"}], "datePublic": "2026-07-17T04:42:00.000Z", "references": [{"url": "https://support.hcl-software.com/csm?id=kb_article&sysparm_article=KB0130919"}], "x_generator": {"engine": "Vulnogram 1.0.2"}, "descriptions": [{"lang": "en", "value": "HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.", "supportingMedia": [{"type": "text/html", "value": "<p>HCL Traveler for Microsoft Outlook (HTMO) is susceptible to a DLL hijacking vulnerability which could allow an attacker to modify or replace the application with malicious content.</p>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-427", "description": "CWE-427 Uncontrolled Search Path Element"}]}], "providerMetadata": {"orgId": "1e47fe04-f25f-42fa-b674-36de2c5e3cfc", "shortName": "HCL", "dateUpdated": "2026-07-17T04:42:54.608Z"}}}, "cveMetadata": {"cveId": "CVE-2026-21770", "state": "PUBLISHED", "dateUpdated": "2026-07-17T13:04:14.448Z", "dateReserved": "2026-01-05T16:07:58.367Z", "assignerOrgId": "1e47fe04-f25f-42fa-b674-36de2c5e3cfc", "datePublished": "2026-07-17T04:42:54.608Z", "assignerShortName": "HCL"}, "dataVersion": "5.2"}