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

Source: https://junglewise.ai/threats/cve-2017-6663-cisco-ios-software-and-cisco-ios-xe-software-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2022-03-03. Updated: 2026-05-10  
License: CC BY 4.0 with a link back

CVE-2017-6663 · Severity: critical · CVSS 6.5 · Exploited in the wild · Published 2022-03-03

A vulnerability in the Autonomic Networking feature of Cisco IOS and IOS XE Software allows an unauthenticated, adjacent attacker to cause a denial-of-service (DoS) condition. The flaw enables an attacker to trigger a reload of autonomic nodes on the affected system.

Technologies: [Cisco IOS](https://junglewise.ai/threats/technologies/ios), [Cisco IOS XE](https://junglewise.ai/threats/technologies/ios-xe), [Cisco IOS XE Software](https://junglewise.ai/threats/technologies/ios-xe-software), [Cisco IOS XR](https://junglewise.ai/threats/technologies/ios-xr). Vendors: [Cisco](https://junglewise.ai/threats/vendors/cisco).

## Quick answers

**Is CVE-2017-6663 exploited in the wild?** Yes. CVE-2017-6663 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.

**How severe is CVE-2017-6663?** Critical severity, with a CVSS score of 6.5, published 3 March 2022.

**Which products and versions are affected?** Cisco IOS Software 15.2(3)E, 15.3(3)S, 15.4(1)S; Cisco IOS XE Software Denali-16.2.1, Denali-16.3.1.

**Is there a fix for CVE-2017-6663?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2017-6663 attacked?** It is attacked from the adjacent network, in an operating system.

**Am I affected by CVE-2017-6663?** Check whether you run Cisco IOS, Cisco IOS XE, Cisco IOS XE Software or one of the others listed. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Cisco IOS Software 15.2(3)E, 15.3(3)S, 15.4(1)S
- Cisco IOS XE Software Denali-16.2.1, Denali-16.3.1

## Timeline

- 2017-07-26: disclosed: Original Cisco advisory date (from URL)
- 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

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