Vulnerability report

Trusted Third Party Report Confirmed Confidence In CISA KEV

CVE-2019-1064

Windows Elevation of Privilege Vulnerability

Microsoft / Windows 10 Version 1703 · affected before publication

Watch CVE-2019-1064 Browse KEV feed
Severity
CVSS 7.8 · High
Confidence
Confirmed
Exploit status
Trusted Third Party Report
EPSS
6.9%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Confidence is confirmed.

Who is affected?

Affected products include Microsoft / Windows 10 Version 1703 and 16 other products, including affected before publication and affected before publication.

What should we do?

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

Overview

Windows Elevation of Privilege Vulnerability

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context. An attacker could then install programs; view, change or delete data.

To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take control of an affected system. The security update addresses the vulnerability by correcting how Windows AppX Deployment Service handles hard links.

Microsoft Affected
Windows 10 Version 1703
Before publication
Microsoft Affected
Windows 10 Version 1803
Before publication
Microsoft Affected
Windows Server, version 1803 (Server Core Installation)
Before publication
Microsoft Affected
Windows 10 Version 1809
Before publication
Microsoft Affected
Windows Server 2019
Before publication
Microsoft Affected
Windows Server 2019 (Server Core installation)
Before publication
Microsoft Affected
Windows 10 Version 1709 for 32-bit Systems
Before publication
Microsoft Affected
Windows 10 Version 1709
Before publication
Microsoft Affected
Windows 10 Version 1903 for 32-bit Systems
Before publication
Microsoft Affected
Windows 10 Version 1903 for x64-based Systems
Before publication
Microsoft Affected
Windows 10 Version 1903 for ARM64-based Systems
Before publication
Microsoft Affected
Windows Server, version 1903 (Server Core installation)
Before publication
Microsoft Affected
Windows 10 Version 1607
Before publication
Microsoft Affected
Windows Server 2016
Before publication
Microsoft Affected
Windows Server 2016 (Server Core installation)
Before publication
View vendor advisory (opens in new tab)
Published
12 Jun 2019
Exploitation Attempts Reported
15 Mar 2022
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

Tags

windows cisa microsoft ransomware malware

CVE References

Exploitation evidence

Evidence of exploitation attempts

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

Exploitation Attempts Observed in the Wild

CISA

Recorded 15 Mar 2022

A trusted third party reported exploitation attempts.

Targeted by Malware-Related Exploitation Attempts

CISA

Recorded 15 Mar 2022

Exploitation attempts against this vulnerability are associated with malware-related payloads.

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 2022-03-15 00:00 UTC

Detection

Operational artifacts and observed signals

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

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

7.8 High

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

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

EPSS

6.9%

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

Weaknesses

Improper Link Resolution Before File Access ('Link Following') CWE-59

Timeline

From disclosure to observed exploitation attempts

  1. 00:00 UTC

    Added to CISA KEV

    Listed in the CISA Known Exploited Vulnerabilities catalog

  2. 00:00 UTC

    Targeted by malware-related exploitation attempts

    Malware-related exploitation attempts or payloads reported

  3. 13:49 UTC

    CVE published

    Vulnerability disclosed publicly

  4. 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-2019-1064

Sample API response 
{
  "cve_id": "CVE-2019-1064",
  "confidence": "Confirmed",
  "cvss_score": 7.8,
  "cvss_estimated": false,
  "epss_score": 0.06886,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}