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CVE-2017-6627

Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service Vulnerability

Exploited in attacks High 7.5 Attack chance: 6.2%
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What it is

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.

CISA: 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.

What to do

Apply updates per vendor instructions.

Deadline for US federal agencies: March 24, 2022

Added to the CISA list
March 3, 2022
Published
September 7, 2017
Severity
High 7.5 CVSS 3.1
Chance of attacks in the next 30 days (EPSS)
6.2% in the top 6.6% of all known vulnerabilities
Weakness
CWE-399
More details
NVD · CVE.org · CISA
All references (3)

More exploited flaws from Cisco

AddedVulnerabilityProductSeverityAttack chance
Apr 19, 2023SNMP Remote Code ExecutionCVE-2017-6742IOS and IOS XE SoftwareHigh 8.821%
Mar 3, 2022IOS Software and Cisco IOS XE Software Denial-of-ServiceCVE-2017-6663IOS and IOS XE SoftwareMedium 6.52.1%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6736IOS and IOS XE SoftwareHigh 8.870%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6737IOS and IOS XE SoftwareHigh 8.845%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6738IOS and IOS XE SoftwareHigh 8.811%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6739IOS and IOS XE SoftwareHigh 8.811%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6740IOS and IOS XE SoftwareHigh 8.811%
Mar 3, 2022SNMP Remote Code ExecutionCVE-2017-6743IOS and IOS XE SoftwareHigh 8.811%

All of them →

Sources: Known Exploited Vulnerabilities (CISA, public domain), CVE records (cve.org) and EPSS (FIRST). The chance of attacks is the EPSS estimate that someone will try to exploit the flaw in the next 30 days.