Threats / Microsoft / CVE-2019-0841
CVE-2019-0841
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Windows AppXSVC improperly handles hard links, allowing privilege escalation. An attacker exploiting this vulnerability could execute processes with elevated privileges.
Verdict
Today item, not a backlog item.
This privilege escalation vulnerability in Windows AppXSVC has been actively exploited in the wild and leveraged in ransomware campaigns. The high EPSS score reflects significant exploitation risk and real-world attack activity.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Public proof-of-concept exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
3 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-15), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.41667 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-59 Link Following — weakness family: Path traversal / file.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious hard link to a protected system resource to bypass AppXSVC access controls.
Business
Attackers gain a reliable entry point to escalate privileges on Windows systems at scale.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary code in an elevated context by leveraging the hard link exploitation path.
Business
Ransomware operators deploy encryption payloads with system-level permissions, bypassing user-mode protections.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistent control over compromised systems through elevated process execution.
Business
Organizations face widespread ransomware infections and data exfiltration across their Windows infrastructure.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05