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

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, Cisco IOS XR. 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

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