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

Published Sep 7, 2017

Updated

A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.

Other sources

A vulnerability in the UDP processing code of Cisco IOS and IOS XE could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and denial of service.

— CISA

Affected Software

73 affected components

cisco IOS=15.1\(2\)gc

cisco IOS=15.1\(2\)gc1

cisco IOS=15.1\(2\)gc2

cisco IOS=15.1\(4\)gc

cisco IOS=15.1\(4\)gc1

cisco IOS=15.1\(4\)gc2

cisco IOS=15.2\(1\)gc

cisco IOS=15.2\(1\)gc1

cisco IOS=15.2\(1\)gc2

cisco IOS=15.2\(2\)gc

cisco IOS=15.2\(3\)gc

cisco IOS=15.2\(3\)gc1

cisco IOS=15.2\(3r\)gca

cisco IOS=15.2\(4\)gc

cisco IOS=15.2\(4\)gc1

cisco IOS=15.2\(4\)gc2

cisco IOS=15.2\(4\)gc3

cisco IOS=15.4\(1\)t

cisco IOS=15.4\(1\)t1

cisco IOS=15.4\(1\)t2

cisco IOS=15.4\(1\)t3

cisco IOS=15.4\(1\)t4

cisco IOS=15.4\(2\)t

cisco IOS=15.4\(2\)t1

cisco IOS=15.4\(2\)t2

cisco IOS=15.4\(3\)m

cisco IOS=15.4\(3\)m1

cisco IOS=15.4\(3\)m2

cisco IOS=15.4\(3\)m2.2

cisco IOS=15.4\(3\)m3

cisco IOS=15.4\(3\)m4

cisco IOS=15.4\(3\)m5

cisco IOS=15.4\(3\)m6

cisco IOS=15.4\(3\)m6a

cisco IOS=15.4\(3\)m7

Cisco IOS XE

Cisco IOS XE=3.14.0s

Cisco IOS XE=3.14.1s

Cisco IOS XE=3.14.2s

Cisco IOS XE=3.14.3s

Cisco IOS XE=3.14.4s

Cisco IOS XE=3.15.0s

Cisco IOS XE=3.15.1cs

Cisco IOS XE=3.15.1s

Cisco IOS XE=3.15.2s

Cisco IOS XE=3.15.3s

Cisco IOS XE=3.15.4s

Cisco IOS XE=3.16.0cs

Cisco IOS XE=3.16.0s

Cisco IOS XE=3.16.1as

Cisco IOS XE=3.16.1s

Cisco IOS XE=3.16.2as

Cisco IOS XE=3.16.2bs

Cisco IOS XE=3.16.2s

Cisco IOS XE=3.16.3as

Cisco IOS XE=3.16.3s

Cisco IOS XE=3.16.4as

Cisco IOS XE=3.16.4bs

Cisco IOS XE=3.16.4ds

Cisco IOS XE=3.16.4s

Cisco IOS XE=3.16.5s

Cisco IOS XE=3.16.6s

Cisco IOS XE=3.17.0s

Cisco IOS XE=3.17.1as

Cisco IOS XE=3.17.1s

Cisco IOS XE=3.17.3s

Cisco IOS XE=3.18.0as

Cisco IOS XE=3.18.0s

Cisco IOS XE=3.18.1s

Cisco IOS XE=3.18.2s

Cisco IOS XE=3.18.3s

Cisco IOS XE=3.18.3vs

cisco IOS and IOS XE Software

Event History

Sep 7, 2017

CVE Published

via MITRE·09:00 PM

Data Sourced

via MITRE·09:00 PM

DescriptionWeakness

Data Sourced

via NVD·09:29 PM

DescriptionSeverityWeaknessAffected Software

Mar 3, 2022

Known Exploited

via CISA·12:00 AM

Frequently Asked Questions

What is the severity of CVE-2017-6627?

CVE-2017-6627 is rated as high severity due to its potential for causing denial of service (DoS) conditions.

How do I fix CVE-2017-6627?

To fix CVE-2017-6627, upgrade Cisco IOS or IOS XE software to a version that addresses the vulnerability.

Which Cisco software versions are affected by CVE-2017-6627?

CVE-2017-6627 affects Cisco IOS versions 15.1, 15.2, and 15.4 as well as IOS XE versions 3.14 to 3.18.

Can CVE-2017-6627 be exploited remotely?

Yes, CVE-2017-6627 can be exploited by unauthenticated remote attackers.

What impact does CVE-2017-6627 have on affected systems?

CVE-2017-6627 can cause the input queue of an affected system to hold UDP packets, leading to a denial of service.