Threats / Microsoft / CVE-2025-30400
CVE-2025-30400
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
A use-after-free vulnerability in Microsoft Windows DWM Core Library allows authorized local attackers to elevate privileges.
Verdict
Today item — known-exploited.
This vulnerability requires local access and prior authorization but enables privilege escalation through memory corruption. Active exploitation in the wild increases risk despite the authorization requirement.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
5 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 2025-05-13).
Probability (EPSS)
EPSS 0.01763 — 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-416 Use After Free — 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 gain initial access as a standard user or service account on a Windows system.
Business
Insider threats or compromised service accounts create a foothold for lateral movement.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I trigger the use-after-free condition in the DWM Core Library through crafted local operations.
Business
Memory corruption vulnerabilities are difficult to patch comprehensively and may persist across updates.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute code with elevated system privileges after successful exploitation.
Business
Full system compromise enables data exfiltration, malware installation, and persistent control of critical 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