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Security advisory.

Possible Qualys Cloud Agent for Windows Race Condition Exploitation prior to [CVE-2023-28142]

Advisory ID: Q-PVD-2023-02
CVE ID:  CVE-2023-28142
QID:  378359
Published: 2023-04-18
CWE: CWE-426

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:N/I:H/A:H


A Race Condition exists in the Qualys Cloud Agent for Windows platform in versions from and before This allows attackers to escalate privileges limited on the local machine during uninstallation of the Qualys Cloud Agent for Windows. Attackers may gain SYSTEM level privileges on that asset to run arbitrary commands.

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 higher of Qualys Cloud Agent for Windows. If possible, customers should enable automatic updates.

Risk Management 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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