Live › vulnerability › CVE-2017-6627
Go to dashboardCisco IOS and IOS XE have a UDP packet processing flaw that lets a remote attacker send UDP packets that wedge an interface input queue. The result is denial of service on the affected router or switch.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 3h before NVD. All times on this page are UTC.
Apply updates per vendor instructions.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Cisco IOS and IOS XE Software | vendor | – | – |
Unknown from the sources.
Apply the updates per the Cisco vendor advisory; the sources do not name the fixed release.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
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