CVE-2017-6663: in the CISA KEV catalogue
Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability. CISA added CVE-2017-6663 to the Known Exploited Vulnerabilities catalogue on 2022-03-03 with a default due date of 2022-03-24. Known ransomware campaign use: Unknown. Forensic triage flag: No.
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 description)
- Vendor / product
- Cisco IOS and IOS XE Software
- CWE
- Not listed
- CISA required action
- Apply updates per vendor instructions.
- EPSS
- 2.1%, percentile 81 (scored 2026-11-03)
EPSS puts about 2.1 in 100 odds (2.1%) on exploitation activity being observed in the next 30 days. Its score is higher than or equal to that of 81% of scored CVEs. This is a model estimate about exploitation anywhere, not about your environment.
Vendor and reference links (from CISA)
Your own deadline under CISA BOD 26-04 depends on exposure, automatability and technical impact: work it out with the BOD 26-04 calculator.
Frequently asked questions
Is CVE-2017-6663 in the CISA KEV catalogue?
Yes. CISA added CVE-2017-6663 (Cisco IOS Software and Cisco IOS XE Software Denial-of-Service Vulnerability) to the Known Exploited Vulnerabilities catalogue on 2022-03-03. CISA's default due date for it is 2022-03-24.
Is CVE-2017-6663 used in ransomware attacks?
CISA marks known ransomware campaign use as Unknown for CVE-2017-6663. That means CISA lacks confirmation, not that ransomware groups do not use it.
What should I do about CVE-2017-6663?
CISA's required action: Apply updates per vendor instructions.
Sources
- CISA, Known Exploited Vulnerabilities Catalog (accessed 2026-11-03)
- FIRST, Exploit Prediction Scoring System (EPSS) (EPSS by FIRST; scores generated by Empirical Security)
- NVD record for CVE-2017-6663