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PatchSiren cyber security CVE debrief

CVE-2016-0099 Microsoft CVE debrief

CVE-2016-0099 is a Microsoft Windows Secondary Logon Service privilege escalation vulnerability. CISA lists it in the Known Exploited Vulnerabilities catalog, notes known ransomware campaign use, and directs defenders to apply vendor updates promptly.

Vendor
Microsoft
Product
Windows
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-03
Original CVE updated
2022-03-03
Advisory published
2022-03-03
Advisory updated
2022-03-03

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.

Sources and references

Verified primary and authoritative sources

  • CVE-2016-0099 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2016-0099

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2016-0099 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2016-0099

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.