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PatchSiren cyber security CVE debrief

CVE-2019-0797 Microsoft CVE debrief

CVE-2019-0797 is a Microsoft Win32k privilege escalation vulnerability that CISA lists in its Known Exploited Vulnerabilities catalog. Because it is in KEV, defenders should treat it as actively exploited or at least confirmed as exploited in the wild and prioritize remediation over routine patch queues.

Vendor
Microsoft
Product
Win32k
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Windows endpoint, workstation, and server administrators; vulnerability management teams; security operations teams; and any organization that relies on Microsoft-managed systems with Win32k exposed through standard platform use.

Technical summary

The supplied sources identify this issue only at a high level as a Microsoft Win32k privilege escalation vulnerability. No further technical details, attack prerequisites, or affected version list are provided in the supplied corpus. The key operational fact is that CISA has added CVE-2019-0797 to KEV, which indicates a known exploitation risk and elevates patch urgency.

Defensive priority

High. CISA KEV inclusion means this vulnerability should be remediated on an accelerated timeline, using vendor guidance and internal asset prioritization.

Recommended defensive actions

  • Apply Microsoft updates according to vendor instructions as soon as possible.
  • Prioritize exposed or high-value endpoints and servers in remediation planning.
  • Verify that the affected systems are identified in asset inventory and patch compliance reports.
  • Track remediation progress against the CISA KEV due date of 2022-05-03 in historical reporting or current equivalent SLA policy.
  • Review security monitoring for unusual privilege-escalation or post-exploitation activity on Microsoft endpoints.

Evidence notes

The classification and remediation urgency are based on the supplied CISA KEV source item, which names the vulnerability as "Microsoft Win32k Privilege Escalation Vulnerability," marks it as a KEV entry, and specifies "Apply updates per vendor instructions." The supplied timeline lists dateAdded as 2021-11-03 and dueDate as 2022-05-03. No CVSS score or deeper technical writeup is included in the supplied corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-0797 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-0797

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

  • CVE-2019-0797 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-0797

    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.