CVE-2021-1622 Denial of service in Cisco IOS XE Software

High 8.6 Published 23 Sep 2021 Updated 7 Nov 2024

Remote attackers can cause denial of service on Cisco cBR-8 routers by sending high-rate COPS packets, triggering a deadlock and resource exhaustion.

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

What is CVE-2021-1622?

CVE-2021-1622 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 23 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the Common Open Policy Service (COPS) of Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers could allow an unauthenticated, remote attacker to cause resource exhaustion, resulting in a denial of service (DoS) condition. This vulnerability is due to a deadlock condition in the code when processing COPS packets under certain conditions. An attacker could exploit this vulnerability by sending COPS packets with high burst rates to an affected device. A successful exploit could allow the attacker to cause the CPU to consume excessive resources, which prevents other control plane processes from obtaining resources and results in a DoS.

Weakness: CWE-667, CWE-833

Which versions are affected by CVE-2021-1622?

It affects 1 product.

Products include Cisco Ios Xe.

How do I fix CVE-2021-1622?

No fix has been published for CVE-2021-1622 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-2021-1622 being exploited?

There is no known exploitation of CVE-2021-1622 in the wild and no public exploit code.

All Cisco Ios Xe vulnerabilities

Sources

Also known as GHSA-6767-7pjf-mxgf.