What is the severity of CVE-2021-1623?

The severity of CVE-2021-1623 is high, with a CVSS score of 7.7.

Which software versions are affected by CVE-2021-1623?

Cisco IOS XE versions up to and excluding 17.6.1a are affected by CVE-2021-1623.

How do I fix CVE-2021-1623?

To fix CVE-2021-1623, Cisco cBR-8 users should upgrade to a non-vulnerable version of Cisco IOS XE.

Vulnerability/
CVE-2021-1623

high

7.7

CWE

399

23/9/2021

7/11/2024

CVE-2021-1623: Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers Simple Network Management Protocol Denial of Service Vulnerability

Q: What is CVE-2021-1623?

CVE-2021-1623 is a vulnerability in the Simple Network Management Protocol (SNMP) punt handling function of Cisco cBR-8 Converged Broadband Routers.

Q: How does CVE-2021-1623 impact Cisco cBR-8 routers?

CVE-2021-1623 could allow an authenticated, remote attacker to overload a device punt path, resulting in a denial of service (DoS) condition.

First published: Thu Sep 23 2021(Updated: )

A vulnerability in the Simple Network Management Protocol (SNMP) punt handling function of Cisco cBR-8 Converged Broadband Routers could allow an authenticated, remote attacker to overload a device punt path, resulting in a denial of service (DoS) condition. This vulnerability is due to the punt path being overwhelmed by large quantities of SNMP requests. An attacker could exploit this vulnerability by sending a large number of SNMP requests to an affected device. A successful exploit could allow the attacker to overload the device punt path, resulting in a DoS condition.

Credit: ykramarz@cisco.com

Affected Software	Affected Version	How to fix
Cisco IOS XE	<17.6.1a
Cisco cBR-8

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Reference Links

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cbr8snmp-zGjkZ9Fc

Frequently Asked Questions

What is CVE-2021-1623?
CVE-2021-1623 is a vulnerability in the Simple Network Management Protocol (SNMP) punt handling function of Cisco cBR-8 Converged Broadband Routers.
How does CVE-2021-1623 impact Cisco cBR-8 routers?
CVE-2021-1623 could allow an authenticated, remote attacker to overload a device punt path, resulting in a denial of service (DoS) condition.
What is the severity of CVE-2021-1623?
The severity of CVE-2021-1623 is high, with a CVSS score of 7.7.
Which software versions are affected by CVE-2021-1623?
Cisco IOS XE versions up to and excluding 17.6.1a are affected by CVE-2021-1623.
How do I fix CVE-2021-1623?
To fix CVE-2021-1623, Cisco cBR-8 users should upgrade to a non-vulnerable version of Cisco IOS XE.

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