# CVE-2017-6627: Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability

Source: https://junglewise.ai/threats/cve-2017-6627-cisco-ios-software-and-cisco-ios-xe-software-udp-packet-processing  
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-2017-6627 · Severity: critical · CVSS 7.5 · Exploited in the wild · Published 2022-03-03

A vulnerability in the UDP processing code of Cisco IOS and IOS XE allows unauthenticated remote attackers to cause a denial-of-service (DoS) condition. The flaw exists because certain application changes create UDP sockets and leave them idle without closing them; sending UDP packets with a destination port of 0 can wedge the interface queue.

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

## Quick answers

**Is CVE-2017-6627 exploited in the wild?** Yes. CVE-2017-6627 is known to be exploited in the wild, first recorded on 3 March 2022. Treat it as urgent.

**How severe is CVE-2017-6627?** Critical severity, with a CVSS score of 7.5, published 3 March 2022.

**Which products and versions are affected?** Cisco IOS 15.1, 15.2, 15.4; Cisco IOS XE 3.14 through 3.18.

**Is there a fix for CVE-2017-6627?** 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-2017-6627 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2017-6627?** Check whether you run Cisco IOS or Cisco IOS XR. 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 15.1, 15.2, 15.4
- Cisco IOS XE 3.14 through 3.18

## Timeline

- 2017-09-06: disclosed: Original Cisco advisory date based on URL slug
- 2022-03-03: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

## Related threats

- [Cisco IOS XR IPv4 packet processing denial of service](https://junglewise.ai/threats/cve-2026-76505-a-vulnerability-in-the-ipv4-packet-processing-functionality-of)
- [Cisco IOS XR Software improper neutralization in command processing](https://junglewise.ai/threats/cve-2026-20278-cisco-ios-xr-software-improper-neutralization-in-command)
- [Cisco IOS CSRF in HTTP Administration component](https://junglewise.ai/threats/cve-2008-4128-cisco-ios-csrf-in-http-administration-component)
- [Cisco IOS XR Software privilege escalation in task group assignment](https://junglewise.ai/threats/cve-2026-20046-cisco-ios-xr-software-privilege-escalation-in-task-group)
- [Cisco IOS XR Software privilege escalation in CLI](https://junglewise.ai/threats/cve-2026-20040-cisco-ios-xr-software-privilege-escalation-in-cli)