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Fencer Intel
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 7y ago modified 4mo 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 and 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.

Is CVE-2019-0841 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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
4y ago
Patch by
2022-04-05 (4y 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
last yr.

Exploit prediction

41.40% chance of exploitation in the next 30 days, higher than 98% of all scored CVEs (FIRST EPSS, 2026-11-09).

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 Intel 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.