CVE-2016-0099 Microsoft CVE debrief

Who should care

Windows administrators, endpoint security teams, SOC analysts, and incident responders should treat this as a patching priority for Microsoft Windows systems because CISA has identified it as known exploited.

Technical summary

The supplied source corpus identifies the issue as a Microsoft Windows Secondary Logon Service privilege escalation vulnerability. No CVSS score or deeper exploit mechanics are provided in the supplied data, but CISA's KEV entry marks it as known exploited and associates it with known ransomware campaign use.

Defensive priority

High and urgent. KEV-listed vulnerabilities should be remediated as soon as possible; CISA's entry set a due date of 2022-03-24 for applying updates per vendor instructions.

Recommended defensive actions

• Apply Microsoft updates per vendor instructions as soon as possible.
• Verify that all Windows assets are inventoried and patch status is confirmed.
• Prioritize remediation for systems that are actively managed, high value, or difficult to rebuild.
• Review security telemetry for signs of suspicious privilege escalation activity on Windows hosts.
• If immediate patching is not possible, use compensating controls and follow standard hardening and access-restriction practices.

Evidence notes

The supplied CISA KEV metadata identifies vendorProject Microsoft, product Windows, and vulnerabilityName 'Microsoft Windows Secondary Logon Service Privilege Escalation Vulnerability.' It also records requiredAction 'Apply updates per vendor instructions,' dateAdded 2022-03-03, dueDate 2022-03-24, and knownRansomwareCampaignUse 'Known.' Official reference links include the CVE record, NVD detail page, CISA KEV catalog, and the underlying KEV JSON feed.

Official resources