Is CVE-2017-8543 being actively exploited?

Yes. CVE-2017-8543 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on May 24, 2022.

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

CVE-2017-8543 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2017-8543

CRITICAL · CVSS 9.8CISA KEV: actively exploitedEPSS 74.2%EU EUVD: exploited

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".

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-281
EPSS score: 74.2% (99th percentile)
In CISA KEV: Yes, added May 24, 2022
In EU EUVD: Yes (EUVD-2017-17493)
Published: June 15, 2017
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Microsoft Windows Search Remote Code Execution Vulnerability

Added to the KEV catalog on May 24, 2022; federal remediation due June 14, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-17493 in the EU Vulnerability Database. ENISA flags it as known exploited. Last updated in EUVD on October 21, 2025.

View on the EU Vulnerability Database

Affected products

microsoft / windows 10 1507
microsoft / windows 10 1507
microsoft / windows 10 1511
microsoft / windows 10 1511
microsoft / windows 10 1607
microsoft / windows 10 1607
microsoft / windows 10 1703
microsoft / windows 10 1703
microsoft / windows 7
microsoft / windows 8.1
microsoft / windows rt 8.1
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2008
microsoft / windows server 2012
microsoft / windows server 2012
microsoft / windows server 2016

Certified products that may be affected

2 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Windows 7 BitLocker™ Drive Encryption - Microsoft Corporation - FIPS 140 1332 - historical
Microsoft Windows 7 Kernel Mode Cryptographic Primitives Library (cng.sys) - Microsoft Corporation - FIPS 140 1328 - historical

References

http://www.securityfocus.com/bid/98824(Broken Link, Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1038667(Broken Link, Third Party Advisory, VDB Entry)
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-8543(Mitigation, Patch, Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-8543(US Government Resource)

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain