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Cloud Security

Security advisory.

Possible Executable Hijacking of Qualys Cloud Agent for Windows prior to [CVE-2023-28140]

Advisory ID: Q-PVD-2023-00
CVE ID:  CVE-2023-28140
Published: 2023-04-18
CWE: CWE-427

Risk Factor

NVD Risk Rating Qualys Risk Rating
CVSSv3.1 Score TBD 6.7 / Medium
CVSSv3.1 Vector (Base) TBD CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H


An Executable Hijacking condition exists in the Qualys Cloud Agent for Windows platform in versions before Attackers may load a malicious copy of a Dependency Link Library (DLL) instead of the DLL that the application was expecting when processes are running with escalated privileges. This vulnerability is bounded only to the time of uninstallation.

At the time of this disclosure, versions before 4.0 are classified as End of Life.


Customers are advised to upgrade to v4.5.3.1 OR of Qualys Cloud Agent for Windows. If possible, customers should enable automatic updates.

Risk Considerations

Qualys has assessed the exploit and believes the risk to be low for the following reasons:

  • Exploitation requires attackers to already have gained access to the endpoint running a vulnerable version of Qualys Cloud Agent.
  • Exploitation is only possible in the moments between installation and uninstallation.
  • Exploitation has only been observed through a customer-reported proof-of-concept.


Lockheed Martin Red Team

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