Is CVE-2017-8543 in the CISA KEV catalog?

Yes. CVE-2017-8543 is on the CISA Known Exploited Vulnerabilities list, added 2022-05-24.

What is the CVSS severity of CVE-2017-8543?

CVE-2017-8543 has a CVSS v3 base score of 9.8 (CRITICAL).

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

CVE-2017-8543 has an EPSS score of 73.76% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix or mitigate CVE-2017-8543?

No published fix for CVE-2017-8543 has been found yet. It is on the CISA Known Exploited Vulnerabilities list; federal agencies must remediate by 2022-06-14. Apply the vendor's mitigations per CISA's guidance.

CVE & CISA-KEV Catalog

CVE-2017-8543

CRITICALCISA KEVEPSS 99th pctl

9.8

CVSS v3

NVD

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".

CWE-281

How to fix

Actively exploited, no published fix found yet

CISA required action: Apply updates per vendor instructions.

Federal remediation due: 2022-06-14

Mitigation guidance may be in the linked vendor advisories in the References section below.

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CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

73.76%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

Known Exploited Vulnerability (CISA KEV)

Microsoft Windows Search Remote Code Execution Vulnerability

Microsoft Windows allows an attacker to take control of the affected system when Windows Search fails to handle objects in memory.

Apply updates per vendor instructions.

Remediation due: 2022-06-14

References

Patch1

portal.msrc.microsoft.com

Third-Party Advisory2

Government Resource1

cisa.gov

Related Vulnerabilities

Other CWE-281 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-0233	High	7.5	69%	-	-
CVE-2017-8589	Critical	9.8	26%	-	-
CVE-2021-33990	Critical	9.8	12%	-	-
CVE-2017-8563	High	8.1	7.2%	-	-
CVE-2017-8578	High	7.8	6.5%	-	-
CVE-2021-32465	High	8.8	4.3%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.