ExploitedIn CISA KEVFix available

CVE-2017-8543

Exploitation confirmed. First attested on 2022-05-24 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-06-15
WeaknessCWE-281

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Microsoft Windows XP SP3, Windows XP x64 XP2, Windows Server 2003 SP2, Windows Vista, Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow an attacker to take control of the affected system when Windows Search fails to handle objects in memory, aka "Windows Search Remote Code Execution Vulnerability".

Timeline

dates in UTC

2017-06-1501:29CVE publishedNVD
2022-05-24Listed as exploited by GCVEGCVE
2022-05-24Exploitation first reportedCISA KEV
2022-05-24Added to the CISA KEV catalogCISA KEV
2025-02-1014:52SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-8543?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-8543?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Microsoft windows server 2008

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD
—	= r2	no fix published	NVD

Microsoft windows server 2012

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD
—	= r2	no fix published	NVD

Microsoft windows 10 1507

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

7 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-06-14

Advisories and patches

portal.msrc.microsoft.comMitigation · Patch · Vendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedamericanhanko/windows-security-cve-2017-8543

CISA Known Exploited Vulnerability

Date Added: 2022-05-24
Patch Due Date: 2022-06-14
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-05-24
GCVEexploitation2022-05-24
CISA-ADPSSVC decisionactive2025-02-10
OpenCVESSVC decisionactive—
CISA-ADPCVSS 3.19.82025-02-10
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.010read 2026-10-23
CISA-ADPweakness (CWE)CWE-2812025-02-10
NVDweakness (CWE)CWE-281read 2026-10-23
FIRST EPSSEPSS score74.4 %read 2026-10-23
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2017-06-15
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-8543?

Is CVE-2017-8543 actively exploited?

Yes. CVE-2017-8543 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-14.

What is the CVSS score for CVE-2017-8543?

CVE-2017-8543 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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