CVE-2021-1367 Cisco NX-OS Software Protocol Independent Multicast Denial of Service Vulnerability

What is CVE-2021-1367?

CVE-2021-1367 is a medium-severity denial of service vulnerability in Cisco Nx-Os, published on 24 Feb 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A vulnerability in the Protocol Independent Multicast (PIM) feature of Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to insufficient input validation. An attacker could exploit this vulnerability by sending a crafted PIM packet to an affected device. A successful exploit could allow the attacker to cause a traffic loop, resulting in a DoS condition.

Weakness: CWE-20

Which versions are affected by CVE-2021-1367?

It affects 1 product.

Products include Cisco Nx-Os.

How do I fix CVE-2021-1367?

No fix has been published for CVE-2021-1367 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-2021-1367 being exploited?

There is no known exploitation of CVE-2021-1367 in the wild and no public exploit code.

Other vulnerabilities in Cisco Nx-Os

• CVE-2024-20399 Cisco NX-OS Command Injection Exploited Medium 6.0
• CVE-2021-1361 Cisco NX-OS Software Unauthenticated Arbitrary File Actions Vulnerability Critical 9.8
• CVE-2018-0301 Memory corruption in Cisco NX-OS unknown Critical 9.8
• CVE-2016-1453 Memory corruption in n/a Critical 9.8
• CVE-2016-1341 Hardcoded credentials in n/a Critical 9.8

All Cisco Nx-Os vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-vvw2-6xj7-ff35.