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Fencer Vulns
high 7.8

CVE-2019-0841 kev+ ransomware in the critical feed json

An elevation of privilege vulnerability exists when Windows AppX Deployment Service (AppXSVC) improperly handles hard links, aka 'Windows E…

published 2019-04-09 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-1592

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2022-03-15, used in ransomware
epss
41.4%
EPSS 41.4% chance of exploitation in 30 days, percentile 98%
public exploits
5
Metasploit, Exploit-DB

Summary

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.

Patch / fix

cisa required action Apply updates per vendor instructions.

Timeline

  1. First public exploit (Metasploit exploit/windows/local/appxsvc_hard_link_privesc)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-04-05 (4 y ago)
Ransomware
Known to be used in ransomware campaigns
Required action
Apply updates per vendor instructions.
Vendor, product
Microsoft, Windows
CISA name
Microsoft Windows AppX Deployment Service (AppXSVC) Privilege Escalation Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

41.40% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Metasploit exploit/windows/local/appxsvc_hard_link_privesc AppXSvc Hard Link Privilege Escalation metasploit exploit, normal rank, 2019-04-09
  • EDB-47128 Microsoft Windows 10 < build 17763 - AppXSvc Hard Link Privilege Escalation (Metasploit) local, 2019-07-16
  • EDB-46976 Microsoft Windows - AppX Deployment Service Local Privilege Escalation (3) local, 2019-06-07
  • EDB-46938 Microsoft Windows - AppX Deployment Service Local Privilege Escalation (2) local, 2019-05-23
  • EDB-46683 Microsoft Windows - AppX Deployment Service Privilege Escalation local, 2019-04-09
  • packetstormsecurity.com http://packetstormsecurity.com/files/153642/AppXSvc-Hard-Link-Privilege-Escalation.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • Microsoft Windows
  • Microsoft Windows Server

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.