Local code execution via unsafe DLL search path
Published Jul 17, 2026 · Updated Jul 17, 2026
DLL hijacking in HCL Traveler for Microsoft Outlook before 3.0.16 allows local users to execute malicious code through unsafe library loading. HCL identifies an uncontrolled DLL search-path element but does not disclose the affected binary, DLL name, or writable directory searched. Exploitation requires high local privileges and user interaction; HCL reports that malicious content can modify or replace the application.
Summary
What happened
DLL hijacking in HCL Traveler for Microsoft Outlook before 3.0.16 allows local users to execute malicious code through unsafe library loading. HCL identifies an uncontrolled DLL search-path element but does not disclose the affected binary, DLL name, or writable directory searched. Exploitation requires high local privileges and user interaction; HCL reports that malicious content can modify or replace the application.
The record
- CVE
- CVE-2026-21770
- Published
- Jul 17, 2026
- Updated
- Jul 17, 2026
- Vendor
- HCLSoftware
- Product
- HCL Traveler for Microsoft Outlook
- Classifications
- CWE-427, T1574.001
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 17, 2026CVE publishedPublication date reported by the CVE source.
- Jul 17, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 3.0.16
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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