CVE-2019-0841
Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability
Does this matter?
Known to be exploited in the wild (CISA KEV, CISA remediation deadline 5 April 2022). Treat as an emergency change: patch or isolate now, then hunt for prior compromise.
Description
An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-0730, CVE-2019-0731, CVE-2019-0796, CVE-2019-0805, CVE-2019-0836.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 41.40% probability · 99th percentile
- Public exploits
- 4 in Exploit-DB · verified · first 9 April 2019
- CISA KEV
- Listed 15 March 2022 · due 5 April 2022 · used in ransomware campaigns
- Weakness
- CWE-59
- Affected
- microsoft/windows 10 1703 · microsoft/windows 10 1709 · microsoft/windows 10 1803 · microsoft/windows 10 1809 · microsoft/windows server 2016 · microsoft/windows server 2019
- Source
- secure@microsoft.com
EPSS 41.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
CISA notes
Apply updates per vendor instructions. https://nvd.nist.gov/vuln/detail/CVE-2019-0841
Public exploits (4)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
| EDB-ID | Title | Type | Published | Verified |
|---|---|---|---|---|
| EDB-47128source ↗ | Microsoft Windows 10 < build 17763 - AppXSvc Hard Link Privilege Escalation (Metasploit)windows · Metasploit | local | 16 July 2019 | yes |
| EDB-46976source ↗ | Microsoft Windows - AppX Deployment Service Local Privilege Escalation (3)windows · SandboxEscaper | local | 7 June 2019 | no |
| EDB-46938source ↗ | Microsoft Windows - AppX Deployment Service Local Privilege Escalation (2)windows · SandboxEscaper | local | 23 May 2019 | no |
| EDB-46683source ↗ | Microsoft Windows - AppX Deployment Service Privilege Escalationwindows · Nabeel Ahmed | local | 9 April 2019 | no |
References
- http://packetstormsecurity.com/files/152463/Microsoft-Windows-AppX-Deployment-Service-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153009/Internet-Explorer-JavaScript-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153114/Microsoft-Windows-AppX-Deployment-Service-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153215/Microsoft-Windows-AppX-Deployment-Service-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153642/AppXSvc-Hard-Link-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0841Patch, Vendor Advisory
- https://www.exploit-db.com/exploits/46683/Exploit, Third Party Advisory, VDB Entry
- https://www.zerodayinitiative.com/advisories/ZDI-19-360/Third Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/152463/Microsoft-Windows-AppX-Deployment-Service-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153009/Internet-Explorer-JavaScript-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153114/Microsoft-Windows-AppX-Deployment-Service-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153215/Microsoft-Windows-AppX-Deployment-Service-Local-Privilege-Escalation.htmlThird Party Advisory, VDB Entry
- http://packetstormsecurity.com/files/153642/AppXSvc-Hard-Link-Privilege-Escalation.htmlExploit, Third Party Advisory, VDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0841Patch, Vendor Advisory
- https://www.exploit-db.com/exploits/46683/Exploit, Third Party Advisory, VDB Entry
- https://www.zerodayinitiative.com/advisories/ZDI-19-360/Third Party Advisory, VDB Entry
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-0841US Government Resource
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.