Threats / Microsoft / CVE-2024-21351
CVE-2024-21351
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Microsoft Windows vulnerability
Microsoft Windows SmartScreen security feature bypass allows attackers to inject code and achieve code execution, potentially exposing data or disrupting system availability.
Verdict
Today item — known-exploited.
A code injection vulnerability in Windows SmartScreen permits attackers to circumvent security protections and execute arbitrary code. Active exploitation in the wild increases risk to unpatched systems.
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
7 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 2024-02-13).
Probability (EPSS)
EPSS 0.30344 — 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-94 Code Injection — weakness family: Injection.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 payload designed to bypass SmartScreen's detection mechanisms.
Business
Security controls fail to prevent malware delivery, increasing breach surface.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I inject code through the bypassed SmartScreen interface to achieve execution on the target system.
Business
Arbitrary code execution enables unauthorized access to sensitive data and system resources.
3
Lateral reach — past segmentation narrative 3
Attacker
I establish persistence or move laterally within the compromised environment.
Business
System availability is compromised and confidential information is at risk of 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