Vulnerability report

Exploited in the wild Confirmed confidence In CISA KEV

CVE-2019-1429

Internet Explorer 9 Remote Code Execution

Microsoft / Internet Explorer 9 · Windows Server 2008 for 32-bit Systems Service Pack 2

Watch CVE-2019-1429 Browse KEV feed
Severity
CVSS 7.5 · High
Confidence
Confirmed
Exploit status
Exploited in the wild
EPSS
77.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2019-1429 is an unauthenticated vulnerability affecting Microsoft Internet Explorer 9 and 6 other products. A remote code execution vulnerability exists in the way that the scripting engine handles objects in...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is confirmed. Listed in CISA KEV.

Who is affected?

Microsoft / Internet Explorer 9 windows server 2008 for 32-bit systems service pack 2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Internet Explorer 9 Remote Code Execution

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka 'Scripting Engine Memory Corruption Vulnerability'.

This CVE ID is unique from CVE-2019-1426, CVE-2019-1427, CVE-2019-1428.

Microsoft Affected
Internet Explorer 9
Windows Server 2008 for 32-bit Systems Service Pack 2 Windows Server 2008 for x64-based Systems Service Pack 2
Microsoft Affected
Internet Explorer 11
Windows 7 for 32-bit Systems Service Pack 1 Windows 7 for x64-based Systems Service Pack 1 Windows Server 2008 R2 for x64-based Systems Service Pack 1 Windows 8.1 for 32-bit systems Windows 8.1 for x64-based systems Windows Server 2012 R2 Windows RT 8.1 Windows 10 for 32-bit Systems Windows 10 for x64-based Systems Windows Server 2016 Windows 10 Version 1607 for 32-bit Systems Windows 10 Version 1607 for x64-based Systems Windows 10 Version 1709 for 32-bit Systems Windows 10 Version 1709 for x64-based Systems Windows 10 Version 1803 for 32-bit Systems Windows 10 Version 1803 for x64-based Systems Windows 10 Version 1803 for ARM64-based Systems Windows 10 Version 1809 for 32-bit Systems Windows 10 Version 1809 for x64-based Systems Windows 10 Version 1809 for ARM64-based Systems Windows Server 2019 Windows 10 Version 1709 for ARM64-based Systems
Microsoft Affected
Internet Explorer 11 on Windows Server 2012
unspecified
Microsoft Affected
Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems
unspecified
Microsoft Affected
Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems
unspecified
Microsoft Affected
Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems
unspecified
Microsoft Affected
Internet Explorer 10
Windows Server 2012
Published
12 Nov 2019
Exploitation Reported
03 Nov 2021
Attack vector
Remote
Complexity
High
Privileges
None
User interaction
Required

Tags

microsoft windows cisa

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

CISA

Recorded 03 Nov 2021

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CISA First 2021-11-03 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

77.3%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Use After Free CWE-416

All CVSS Scores

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v2.0 7.6 High

AV:N/AC:H/Au:N/C:C/I:C/A:C

Timeline

From disclosure to observed exploitation

  1. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. 18:53 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 00:00 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2019-1429

Sample API response 
{
  "cve_id": "CVE-2019-1429",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.7729,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}