CVE-2021-1353 Cisco StarOS IPv4 Denial of Service Vulnerability

What is CVE-2021-1353?

CVE-2021-1353 is a medium-severity denial of service vulnerability in Cisco ASR 5000 Series Software, published on 20 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability in the IPv4 protocol handling of Cisco StarOS could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to a memory leak that occurs during packet processing. An attacker could exploit this vulnerability by sending a series of crafted IPv4 packets through an affected device. A successful exploit could allow the attacker to exhaust the available memory and cause an unexpected restart of the npusim process, leading to a DoS condition on the affected device.

Weakness: CWE-401

Which versions are affected by CVE-2021-1353?

It affects 2 products.

Products include Cisco Staros, Cisco Virtualized Packet Core-Single Instance.

How do I fix CVE-2021-1353?

No fix has been published for CVE-2021-1353 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-2021-1353 being exploited?

There is no known exploitation of CVE-2021-1353 in the wild and no public exploit code.

Other vulnerabilities in Cisco ASR 5000 Series Software

• CVE-2023-20046 Auth bypass in Cisco ASR 5000 Series Software High 8.8
• CVE-2019-1869 Cisco StarOS Denial of Service Vulnerability High 8.6
• CVE-2018-0369 Denial of service in Cisco StarOS unknown High 8.6
• CVE-2017-6707 Command injection in Cisco StarOS High 8.2
• CVE-2021-1539 Cisco ASR 5000 Series Software Authorization Bypass Vulnerabilities High 8.1

Sources

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

Also known as GHSA-92xw-vwgc-8994.