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PatchSiren cyber security CVE debrief

CVE-2023-36424 Microsoft CVE debrief

CVE-2023-36424 is a Microsoft Windows out-of-bounds read vulnerability that CISA has added to its Known Exploited Vulnerabilities catalog, which means it is treated as a known-exploited issue. The supplied corpus does not include a CVSS score or detailed vendor impact analysis, so the safest response is to follow Microsoft’s advisory and CISA’s required action guidance immediately.

Vendor
Microsoft
Product
Windows
CVSS
HIGH 7.8
CISA KEV
Listed
Original CVE published
2026-04-13
Original CVE updated
2026-04-13
Advisory published
2026-04-13
Advisory updated
2026-04-13

Who should care

Windows administrators, endpoint security teams, IT operations, and cloud service operators running Windows systems should prioritize this issue because it is listed in CISA KEV.

Technical summary

The vulnerability is identified as an out-of-bounds read in Microsoft Windows. CISA’s KEV listing indicates known exploitation, but the supplied source set does not provide deeper technical mechanics, CVSS, or affected component details. Use the Microsoft advisory linked from CISA for any vendor-specific remediation or mitigation steps.

Defensive priority

High

Recommended defensive actions

  • Review Microsoft’s advisory for CVE-2023-36424 and apply the vendor-recommended mitigation or update path as soon as possible.
  • Prioritize remediation before the CISA KEV due date of 2026-04-27.
  • Inventory Windows assets to confirm exposure and verify patch status across endpoints, servers, and any Windows-based cloud services.
  • If mitigations are unavailable, follow CISA guidance to discontinue use of the product; for cloud services, follow applicable BOD 22-01 guidance.

Evidence notes

This debrief is based only on the supplied CISA KEV record and the official Microsoft, NVD, and CVE links. The corpus confirms vendor/product, known exploitation status, and CISA dates, but does not provide CVSS, exploit details, or a full remediation bulletin.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-36424 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-36424

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

  • CVE-2023-36424 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-36424

    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.