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PatchSiren cyber security CVE debrief

CVE-2016-3309 Microsoft CVE debrief

CVE-2016-3309 is a Microsoft Windows kernel privilege escalation vulnerability that CISA lists in the Known Exploited Vulnerabilities catalog. The KEV entry marks it as known to be exploited and notes known ransomware campaign use, so Windows environments should treat remediation as a priority and apply vendor updates without delay.

Vendor
Microsoft
Product
Windows
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-15
Original CVE updated
2022-03-15
Advisory published
2022-03-15
Advisory updated
2022-03-15

Who should care

Organizations running Microsoft Windows, especially endpoint, server, and identity/security teams responsible for patching, vulnerability management, and privilege boundary controls.

Technical summary

The official sources in the supplied corpus identify CVE-2016-3309 as a Windows kernel privilege escalation vulnerability. CISA’s KEV entry confirms known exploitation and records known ransomware campaign use as "Known." The corpus does not provide deeper technical details, affected-version specifics, or exploit mechanics, so defensive guidance should focus on remediation and verification rather than assumptions about root cause.

Defensive priority

High / urgent due to confirmed known exploitation and ransomware-campaign association.

Recommended defensive actions

  • Apply Microsoft updates per vendor instructions for all affected Windows systems.
  • Use the CISA KEV entry to confirm remediation tracking and closeout for CVE-2016-3309.
  • Verify patch status across the full Windows asset inventory, including endpoints and servers.
  • Prioritize any systems that remain unpatched in security monitoring and remediation workflows.
  • Document completion against the KEV due date provided in the source record (2022-04-05) as a historical reference point.

Evidence notes

CISA’s Known Exploited Vulnerabilities catalog lists CVE-2016-3309 as "Microsoft Windows Kernel Privilege Escalation Vulnerability," with dateAdded 2022-03-15, dueDate 2022-04-05, and knownRansomwareCampaignUse marked "Known." The source item also instructs: "Apply updates per vendor instructions." Official CVE and NVD links are included in the corpus as reference points; the supplied text does not add deeper technical detail.

Sources and references

Verified primary and authoritative sources

  • CVE-2016-3309 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2016-3309

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

  • CVE-2016-3309 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2016-3309

    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.