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PatchSiren cyber security CVE debrief

CVE-2010-0249 Microsoft CVE debrief

This debrief provides an overview of CVE-2010-0249, a use-after-free vulnerability in Microsoft Internet Explorer. The CVE record was published on 2026-05-20T00:00:00.000Z and has not been modified since then. The vulnerability affects Microsoft Internet Explorer, and defenders should assess exposure and apply mitigations. The debrief aims to provide an executive overview covering affected product or component, vulnerability class, likely operational impact, source-confidence limits, and review context.

Vendor
Microsoft
Product
Internet Explorer
CVSS
HIGH 8.8
CISA KEV
Listed
Original CVE published
2026-05-20
Original CVE updated
2026-05-20
Advisory published
2026-05-20
Advisory updated
2026-05-20

Who should care

Defenders responsible for Microsoft Internet Explorer deployments should assess exposure and apply mitigations. The affected operators include Microsoft Internet Explorer users, and the vulnerability-management impact requires verifying exposure and applying mitigations per vendor instructions. The security-team impact requires reviewing compensating controls for exposed systems while remediation is scheduled and

Why it matters

CVE-2010-0249 is a use-after-free vulnerability in Microsoft Internet Explorer that requires verification of exposure and application of mitigations.

  • Verify exposure of Microsoft Internet Explorer in your environment
  • Apply mitigations per vendor instructions

Technical summary

CVE-2010-0249 is a use-after-free vulnerability in Microsoft Internet Explorer that requires verification of exposure and application of mitigations. The vulnerability affects Microsoft Internet Explorer, and defenders should prioritize verifying exposure and applying mitigations per vendor instructions. The technical summary aims to provide affected product context, defensive impact, and source-grounded technical framing without unsupported root-cause or exploit claims.

Defensive priority

Defenders should prioritize verifying exposure and applying mitigations per vendor instructions.

Recommended defensive actions

  • Verify exposure of Microsoft Internet Explorer in your environment
  • Apply mitigations per vendor instructions
  • Follow applicable BOD 22-01 guidance for cloud services

Evidence notes

The CVE record and CISA KEV catalog provide official information about this vulnerability. The evidence is limited to the supplied source corpus, and defenders should verify exposure and apply mitigations per vendor instructions. The notes aim to provide source grounding, evidence limits, known and unknown affected scope, and what defenders should verify.

Sources and references

Verified primary and authoritative sources

  • CVE-2010-0249 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2010-0249

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

  • CVE-2010-0249 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2010-0249

    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

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.