CVE-2019-1253VulnerabilityPublished 03/15/2022Updated 10/24/2026
CVE-2019-1253: Microsoft Windows AppX Deployment Server Privilege Escalation Vulnerability
Affects Microsoft WindowsSource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 03/15/2022
- KEV deadline
- 04/05/2022
- Ransomware
- Used in ransomware campaigns
- EPSS
- 11.6% chance of exploitation in 30 days – higher than 96% of CVEs
What to do
CISA required action
Apply updates per vendor instructions.
Description
CVE-2019-1253 is a high-severity privilege escalation vulnerability in Microsoft Windows affecting the AppX Deployment Server. The vulnerability arises from improper handling of junctions by the AppX Deployment Server, allowing attackers to escalate privileges. It has been exploited in the wild and is known to have been used in ransomware campaigns.