CVE-2019-0841

Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability

Microsoft WindowsOperating systems

CVSS

7.8High

ExploitationExploited in the wildAdded to KEV 15 Mar 2022. Known ransomware useCISA KEV

Exploit odds (EPSS)41.4%Chance of exploitation activity in the next 30 days, higher than 98% of CVEs. Scored 23 Oct 2026FIRST EPSS

Fixed inNone listedNo source names a fixed version. Check the vendor advisory below

Federal deadline5 Apr 2022Remediation due date for US federal agenciesCISA KEV

CISA required actionApply updates per vendor instructions. CISA KEV

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Timeline

9 Apr 2019Exploit code publicMetasploit
9 Apr 2019, 20:18 UTCPublishedCVE List
15 Mar 2022Added to CISA KEVCISA KEV

Public exploit code and templates 6

Exploit moduleAppXSvc Hard Link Privilege Escalation 9 Apr 2019Metasploit
Local exploitMicrosoft Windows - AppX Deployment Service Local Privilege Escalation (2) 23 May 2019Exploit-DB
Local exploitMicrosoft Windows - AppX Deployment Service Local Privilege Escalation (3) 7 Jun 2019Exploit-DB
Local exploitMicrosoft Windows - AppX Deployment Service Privilege Escalation 9 Apr 2019Exploit-DB
Local exploitMicrosoft Windows 10 < build 17763 - AppXSvc Hard Link Privilege Escalation (Metasploit) 16 Jul 2019Exploit-DB
Local exploitMicrosoft Windows 10 < build 17763 - AppXSvc Hard Link Privilege Escalation (Metasploit) 16 Jul 2019Exploit-DB

Listed so defenders can prioritize. Threatline links to the source and does not host exploit code.

Description

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.

Text from CVE List

Affected versions 15