Threats / Microsoft / CVE-2018-8120
CVE-2018-8120
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Win32k vulnerability
A privilege escalation vulnerability in Windows Win32k component due to improper memory object handling. Actively exploited in the wild and associated with ransomware campaigns.
Verdict
Today item, not a backlog item.
This vulnerability enables local attackers to escalate privileges on affected Windows systems. Active exploitation and ransomware association indicate significant real-world risk despite no CVSS score assignment.
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
16 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 0.73721 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Microsoft, Win32k. Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-404 CWE-404 — weakness family: Resource / availability.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
Gain initial code execution on target Windows system through separate vector
Business
Attacker establishes foothold with limited privileges
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
Trigger Win32k memory object handling flaw to escalate to system-level privileges
Business
Attacker obtains unrestricted control of compromised host
3
Lateral reach — past segmentation narrative 3
Attacker
Deploy ransomware payload with elevated privileges across system and network
Business
Organization experiences widespread encryption of critical data and operational shutdown
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