HCL Traveler for Microsoft Outlook (HTMO) is susceptible to DLL hijacking
Priority LOW 30CWE-427Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- High
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-427.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00163 5th percentileScored 2026-11-07
Fix Fixed HCL Traveler for Microsoft Outlook (HTMO) (HCLSoftware): 3.0.16
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| HCL Software | HCL Traveler for Microsoft Outlook (HTMO) | before 3.0.16 | 3.0.16 | Patch available | CNA |
- HCL Traveler for Microsoft Outlook (HTMO) VendorHCL Software Affected before 3.0.16 Fixed in 3.0.16 Patch available CNA
Remediation
- Fix · CNA HCL Traveler for Microsoft Outlook (HTMO) (HCLSoftware) Fixed in 3.0.16
Timeline
- 2026-10-02 Threatist record created from CVE-2026-21770
- 2026-10-03 Alias added: GHSA-7vgx-3mff-rjp8
More HCL Software vulnerabilities
- TI-2023-24505 Path Traversal which allows file upload capability affects DRYiCE MyXalytics CVSS 3.1CRITICAL 9.8
- TI-2022-22044 Out-of-bounds write in HCL Software Notes CVSS 3.1CRITICAL 9.8
- TI-2022-22043 Out-of-bounds write in HCL Software Domino CVSS 3.1CRITICAL 9.8
- TI-2022-22042 Out-of-bounds write in HCL Software Notes CVSS 3.1CRITICAL 9.8
- TI-2022-22041 Out-of-bounds write in HCL Software Domino CVSS 3.1CRITICAL 9.8
- TI-2022-22040 Out-of-bounds write in HCL Software Notes CVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-21770 · CVE Program
- CVE-2026-21770 · NVD
- FIRST EPSS
- GHSA-7vgx-3mff-rjp8 · GitHub Advisory Database · CC BY 4.0
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