CVE-2021-1623 : Security Advisory and Response

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.

Understanding CVE-2021-1623

This vulnerability affects Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers, potentially enabling a denial of service attack.

What is CVE-2021-1623?

The vulnerability in SNMP punt handling function can be exploited by sending a large number of SNMP requests to the target device, leading to a DoS condition.

The Impact of CVE-2021-1623

Successful exploitation could result in overloading the device punt path, causing a denial of service situation with high availability impact.

Technical Details of CVE-2021-1623

The vulnerability is classified with a CVSS base score of 7.7, indicating a high severity level.

Vulnerability Description

The issue arises from the overflow of SNMP requests overwhelming the punt path, affecting the device's processing capability.

Affected Systems and Versions

Cisco IOS XE Software for Cisco cBR-8 Converged Broadband Routers is affected by this vulnerability.

Exploitation Mechanism

An authenticated, remote attacker can exploit the vulnerability by flooding the device with a large volume of SNMP requests.

Mitigation and Prevention

It is crucial to take immediate steps to mitigate the risk and implement long-term security practices.

Immediate Steps to Take

Organizations should apply security patches and configurations recommended by Cisco to address the vulnerability.

Long-Term Security Practices

Regularly monitor and update SNMP configurations, implement access controls, and leverage network intrusion detection systems (IDS).

Patching and Updates

Stay informed about security advisories from Cisco and promptly install relevant patches and updates to secure the network infrastructure.