CVE-2017-6627

State: Published
Severity: 7.5 High
Published: Sep 7, 2017
Updated: Oct 21, 2025
Reserved: Mar 9, 2017

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-399

Affected Products

Product	Versions
Cisco IOS and Cisco IOS XEn/a	Cisco IOS and Cisco IOS XEAffected

References

100644vdb-entry
1039289vdb-entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ios-udp
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6627government-resource

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