Is CVE-2017-6663 being actively exploited?

Yes. CVE-2017-6663 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added on March 3, 2022.

What is the CVSS score for CVE-2017-6663?

CVE-2017-6663 has a CVSS 3.1 base score of 6.5 (MEDIUM).

CVE-2017-6663

MEDIUM · CVSS 6.5CISA KEV: actively exploitedEPSS 2.1%EU EUVD: exploited

A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.

Key facts

CVSS score: 6.5 (v3.1)
Severity: MEDIUM
CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS score: 2.1% (81th percentile)
In CISA KEV: Yes, added March 3, 2022
In EU EUVD: Yes (EUVD-2017-15717)
Published: August 7, 2017
NVD last modified: June 17, 2026
Status: Analyzed

CISA Known Exploited Vulnerability

Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability

Added to the KEV catalog on March 3, 2022; federal remediation due March 24, 2022.

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2017-15717 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

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and 136 more…

Certified products that may be affected

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

Cisco Catalyst 3K/4K Wired Access Switches running IOS-XE 3.8.0E - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10688-2016 - archived
Cisco Aggregation Services Router (ASR) 1000 Series, IOS XE 3.13 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10609-2015 - archived
Cisco Integrated Services Router 4400 Series (ISR-4400), IOS XE 3.13.0 - Cisco Systems, Inc. - Common Criteria CCEVS-VR-VID-10600-2015 - archived

References

http://www.securityfocus.com/bid/99973(Broken Link, Third Party Advisory, VDB Entry)
http://www.securitytracker.com/id/1038999(Broken Link, Third Party Advisory, VDB Entry)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170726-anidos(Vendor Advisory)
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6663(US Government Resource)

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

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