Threats / Microsoft / CVE-2019-1129
CVE-2019-1129
· 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.
A privilege escalation flaw in Windows AppXSVC's hard link handling enables attackers to gain elevated execution context. Active exploitation and ransomware deployment have been observed in the wild.
01
Is it exploitable?
— the evidence, ranked above the scoreReported 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 0.01797 — 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 file to trigger improper AppXSVC processing.
Business
Attacker gains foothold with elevated privileges on Windows systems.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I execute arbitrary code in the elevated context obtained through AppXSVC exploitation.
Business
Attacker achieves system-level code execution, bypassing user-mode protections.
3
Lateral reach — past segmentation narrative 3
Attacker
I deploy ransomware or lateral movement tools using the elevated execution capability.
Business
Organization faces data encryption, operational disruption, and potential extortion demands.
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