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PatchSiren cyber security CVE debrief

CVE-2019-1429 Microsoft CVE debrief

CVE-2019-1429 is a Microsoft Internet Explorer scripting engine memory corruption vulnerability. In the supplied corpus, CISA has added it to the Known Exploited Vulnerabilities catalog, which means it is treated as a known-exploited issue and should be remediated using vendor guidance.

Vendor
Microsoft
Product
Internet Explorer
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

Security teams, Windows administrators, and owners of legacy applications or controls that still rely on Internet Explorer or the IE scripting engine.

Technical summary

The available source material identifies the issue as a memory corruption vulnerability in Microsoft Internet Explorer's scripting engine. The corpus does not include exploit mechanics, affected versions, or impact details beyond the CVE title and CISA KEV listing. CISA's KEV entry and accompanying notes direct defenders to apply updates per vendor instructions.

Defensive priority

High. CISA KEV inclusion is a strong signal to prioritize remediation on any systems that still depend on Internet Explorer or its scripting engine, especially where patch compliance is lagging.

Recommended defensive actions

  • Apply Microsoft updates per vendor instructions.
  • Confirm exposure by inventorying systems and applications that still invoke Internet Explorer or the IE scripting engine.
  • Remove or disable legacy Internet Explorer dependence where feasible.
  • Verify remediation against the CISA KEV due date and internal patch SLAs.
  • Recheck endpoint compliance after patching and validate that legacy compatibility paths are no longer required.

Evidence notes

This debrief is based only on the supplied CISA KEV source item metadata and the official links provided in the corpus. The source identifies the vulnerability name, vendor, product, KEV status, date added, due date, and remediation note. No vendor advisory text, exploit details, or CVSS score were included in the supplied material, so those elements are not asserted here.

Sources and references

Verified primary and authoritative sources

  • CVE-2019-1429 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2019-1429

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

  • CVE-2019-1429 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2019-1429

    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.