CVE-2017-6627 Cisco IOS Software and Cisco IOS XE Software UDP Packet Processing Denial-of-Service
Remote attackers can cause a denial of service on Cisco IOS devices by sending UDP packets to port 0, wedging the interface queue.
- Exploited in the wild
- Since 3 Mar 2022
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-6627?
CVE-2017-6627 is a high-severity denial of service vulnerability in Cisco Ios, published on 7 Sep 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2017-6627?
It affects 2 products.
Products include Cisco Ios, Cisco Ios Xe.
How do I fix CVE-2017-6627?
No fix has been published for CVE-2017-6627 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 24 Mar 2022.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2017-6627 being exploited?
Yes. Attackers have exploited CVE-2017-6627 in the wild since at least 3 Mar 2022.
Other vulnerabilities in Cisco Ios
- CVE-2017-12240 Cisco IOS and IOS XE Software DHCP Remote Code Execution
- CVE-2017-3881 Cisco IOS and IOS XE Remote Code Execution
- CVE-2018-0167 Cisco IOS, XR, and XE Software Buffer Overflow
- CVE-2017-6736 Cisco IOS and IOS XE Software SNMP Remote Code Execution
- CVE-2017-6737 Cisco IOS and IOS XE Software SNMP Remote Code Execution
Sources
Also known as GHSA-c93x-vxh6-pfqp.