Threats / Microsoft / CVE-2023-36424
CVE-2023-36424
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows Common Log File System Driver contains an out-of-bounds read vulnerability enabling privilege escalation. The flaw has been exploited in the wild.
Verdict
Today item — known-exploited.
An out-of-bounds read in the Windows CLFS driver allows attackers to read sensitive kernel memory and escalate privileges. Active exploitation in the wild increases risk despite moderate EPSS score.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
1 independent public report 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 2026-04-13).
Probability (EPSS)
EPSS 0.12184 — 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-125 Out-of-bounds Read — weakness family: Memory safety.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 input to trigger an out-of-bounds read in the CLFS driver, accessing kernel memory regions outside intended boundaries.
Business
Attackers gain unauthorized access to sensitive kernel data, bypassing security controls and establishing a foothold for further system compromise.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I leverage the leaked kernel memory to identify security mechanisms and craft a privilege escalation exploit.
Business
System integrity is compromised as attackers elevate from user to kernel-level privileges, gaining complete control over affected Windows systems.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute arbitrary code with kernel privileges to install persistent malware or establish remote access.
Business
Critical business systems face total compromise, data exfiltration, and operational disruption with minimal detection or recovery options.
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