CVEs / CVE-2017-6663

CVE-2017-6663: Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability

Known exploited in the CISA KEV catalog since 3 Mar 2022
medium 6.5 CVSS 3.1 (NVD)
EPSS 2.11% chance of exploitation in the next 30 days, higher than 81% of CVEs (30 Oct 2026)
Last changed at its sources 17 Jun 2026

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Summary

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 denial-of-service (DoS).
CISA, Known Exploited Vulnerabilities catalog

Description

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.
The CVE record, via NVD · published 7 Aug 2017 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
n/a Cisco IOS and IOS XE	Cisco IOS and IOS XE	—

Exploitation

In CISA KEV since	3 Mar 2022
Due date for US federal agencies	24 Mar 2022
Used in ransomware campaigns	Unknown
Required action	Apply updates per vendor instructions.

Severity

CVSS 3.1	6.5 medium `CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` Scored by NVD

References

CVE-2017-6663 on NVD
CVE-2017-6663 in the CISA KEV catalog
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

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.