CVEs / CVE-2019-1064
CVE-2019-1064: Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability
- Known exploited in the CISA KEV catalog since 15 Mar 2022
- high 7.8 CVSS 3.1 (NVD)
- EPSS 6.88% chance of exploitation in the next 30 days, higher than 94% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
A privilege escalation vulnerability exists when Windows AppXSVC improperly handles hard links. An attacker who successfully exploited this vulnerability could run processes in an elevated context.
Description
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.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 10 Version 1703 | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1803 | from 10.0.0, before publication | publication |
| Microsoft Windows Server, version 1803 (Server Core Installation) | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1809 | from 10.0.17763.0, before publication | publication |
| Microsoft Windows 10 Version 1809 | from 10.0.0, before publication | publication |
| Microsoft Windows Server 2019 | from 10.0.17763.0, before publication | publication |
| Microsoft Windows Server 2019 (Server Core installation) | from 10.0.17763.0, before publication | publication |
| Microsoft Windows 10 Version 1709 for 32-bit Systems | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1709 | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1903 for 32-bit Systems | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1903 for x64-based Systems | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1903 for ARM64-based Systems | from 10.0.0, before publication | publication |
| Microsoft Windows Server, version 1903 (Server Core installation) | from 10.0.0, before publication | publication |
| Microsoft Windows 10 Version 1607 | from 10.0.14393.0, before publication | publication |
| Microsoft Windows Server 2016 | from 10.0.14393.0, before publication | publication |
| Microsoft Windows Server 2016 (Server Core installation) | from 10.0.14393.0, before publication | publication |
Exploitation
| In CISA KEV since | 15 Mar 2022 |
|---|---|
| Due date for US federal agencies | 5 Apr 2022 |
| Used in ransomware campaigns | Known |
| Required action | Apply updates per vendor instructions. |
Severity
| CVSS 3.1 | 7.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HScored by NVD |
|---|---|
| Weakness | CWE-59 |
References
- CVE-2019-1064 on NVD
- CVE-2019-1064 in the CISA KEV catalog
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1064 Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1064 Patch, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-1064 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.