Threats / Microsoft / CVE-2023-36884
CVE-2023-36884
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Microsoft Windows vulnerability
Microsoft Windows Search vulnerability allows attackers to bypass Mark of the Web defenses via specially crafted files, enabling remote code execution.
Verdict
Today item, not a backlog item.
A race condition in Windows Search permits MOTW bypass on malicious files, facilitating code execution. Active exploitation and ransomware deployment confirm critical severity despite missing CVSS score.
CISA KEV Yes · 2023-07-175Ransomware use Flagged5EPSS 0.98932 (verify live)6Exploit Public PoC7CVSS 7.53CISA SSVC Exploitation: active · Automatable: no · Impact: total4
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
39 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 2023-07-17), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.98932 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C) · Affected: Microsoft, Windows. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-362 Race Condition.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 6 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
WeaknessCWE-362 · Race Condition
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 file designed to exploit the race condition in Windows Search's MOTW handling.
Business
Attackers gain ability to deliver executable payloads that bypass security zone restrictions.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I deliver the file to a target via email, web download, or file sharing, relying on the MOTW bypass.
Business
Initial access vectors become more effective as traditional file-based defenses fail to trigger warnings.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute code with user privileges when the file is opened, bypassing security prompts.
Business
Remote code execution occurs on victim systems without user awareness or intervention.
4
Data at risk — exfiltration narrative 4
Attacker
I deploy ransomware or establish persistence for further compromise.
Business
Organizations face data encryption, operational disruption, and extortion demands from ransomware campaigns.
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