Threats / Microsoft / CVE-2023-21823
CVE-2023-21823
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows Graphic Component vulnerability allowing privilege escalation via integer overflow. Actively exploited in the wild.
Verdict
Today item — known-exploited.
Integer overflow in Windows graphics processing enables local privilege escalation. Active exploitation observed. Requires local access but grants elevated system permissions, posing significant risk to Windows deployments.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 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 2023-02-14).
Probability (EPSS)
EPSS 0.05563 — 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-190 Integer Overflow — 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 the graphics component that triggers an integer overflow condition.
Business
An attacker gains local code execution with elevated privileges, bypassing access controls.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I exploit the overflow to write to protected memory regions and escalate my process privileges.
Business
System integrity is compromised as the attacker operates with kernel-level or SYSTEM account permissions.
3
Lateral reach — past segmentation narrative 3
Attacker
I maintain persistence or move laterally across the network using elevated access.
Business
Organizational security perimeter is breached; lateral movement enables compromise of additional systems and data exfiltration.
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