CVE-2017-12211 Denial of service in Cisco IOS and Cisco IOS XE

Medium 5.3 Published 7 Sep 2017 Updated 5 Aug 2024

An authenticated remote attacker can cause high CPU usage or device reload by exploiting IPv6 SNMP code corruption in Cisco IOS.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2017-12211?

CVE-2017-12211 is a medium-severity denial of service vulnerability in Cisco Ios, published on 7 Sep 2017. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

A vulnerability in the IPv6 Simple Network Management Protocol (SNMP) code of Cisco IOS and Cisco IOS XE Software could allow an authenticated, remote attacker to cause high CPU usage or a reload of the device. The vulnerability is due to IPv6 sub block corruption. An attacker could exploit this vulnerability by polling the affected device IPv6 information. An exploit could allow the attacker to trigger high CPU usage or a reload of the device. Known Affected Releases: Denali-16.3.1. Cisco Bug IDs: CSCvb14640.

Weakness: CWE-399

Which versions are affected by CVE-2017-12211?

It affects 2 products.

Products include Cisco Ios, Cisco Ios Xe.

How do I fix CVE-2017-12211?

No fix has been published for CVE-2017-12211 yet. Limit exposure of the affected software until one is available.

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-2017-12211 being exploited?

There is no known exploitation of CVE-2017-12211 in the wild and no public exploit code.

All Cisco Ios vulnerabilities

Sources

Also known as GHSA-7664-hhqm-4p3m.