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PatchSiren cyber security CVE debrief

CVE-2019-0541 Microsoft CVE debrief

CVE-2019-0541 is a Microsoft MSHTML remote code execution vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. Because it is KEV-listed, defenders should treat it as actively exploited in the wild and prioritize remediation using Microsoft’s guidance.

Vendor
Microsoft
Product
MSHTML
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

Organizations that run Microsoft software or endpoints that include the MSHTML component, especially security teams responsible for patching and exposure reduction on Windows fleets.

Technical summary

The supplied corpus identifies this issue as a Microsoft MSHTML remote code execution vulnerability. CISA’s KEV entry confirms it is considered known-exploited and directs organizations to apply updates per vendor instructions. No further technical details, attack preconditions, or exploit mechanics are provided in the supplied source set.

Defensive priority

High. KEV-listed vulnerabilities indicate known exploitation and should be prioritized for remediation according to vendor guidance and internal patch SLAs.

Recommended defensive actions

  • Apply Microsoft updates and remediation steps as directed by the vendor.
  • Prioritize affected Microsoft endpoints and any systems that include or rely on MSHTML.
  • Verify exposure across the environment and accelerate patch deployment for any vulnerable assets.
  • Monitor security advisories and fleet telemetry for signs of attempted exploitation.
  • Use the CISA KEV catalog to track remediation status until the issue is fully addressed.

Evidence notes

This debrief is based on the supplied CISA KEV source item and the official CVE/NVD reference links included in the corpus. The corpus states the vulnerability name, affected product component (Microsoft MSHTML), KEV status, date added (2021-11-03), due date (2022-05-03), and the required action to apply vendor updates. No CVSS score or additional technical detail was provided in the supplied data.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-0541 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-0541

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

  • CVE-2019-0541 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-0541

    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.