CVE-2021-1377 : Vulnerability Insights and Analysis
Learn about CVE-2021-1377, a vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS and IOS XE Software. Understand its impact, technical details, and mitigation steps.
A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and IOS XE Software has been identified. This could allow an unauthenticated, remote attacker to prevent an affected device from resolving ARP entries for legitimate hosts on connected subnets. The exploit could result in a denial of service (DoS) condition by causing ARP requests to fail for legitimate hosts.
Understanding CVE-2021-1377
This section provides a detailed overview of the vulnerability.
What is CVE-2021-1377?
The vulnerability in ARP management of Cisco IOS Software and IOS XE Software allows attackers to disrupt ARP entry resolution, leading to denial of service conditions by targeting legitimate hosts on connected subnets.
The Impact of CVE-2021-1377
The exploit could result in a denial of service (DoS) condition by making ARP requests on affected devices unsuccessful for legitimate hosts.
Technical Details of CVE-2021-1377
This section delves into the technical aspects of the vulnerability.
Vulnerability Description
The vulnerability arises due to mismanaged ARP entries, enabling continuous traffic from attackers to create incomplete ARP entries and disrupt ARP resolution for legitimate hosts.
Affected Systems and Versions
The vulnerability affects Cisco IOS Software and Cisco IOS XE Software. Specific versions impacted are not applicable.
Exploitation Mechanism
Attackers can exploit this vulnerability by continuously sending traffic that results in incomplete ARP entries, hence disrupting ARP resolution for legitimate hosts.
Mitigation and Prevention
This section outlines measures to mitigate and prevent exploitation of CVE-2021-1377.
Immediate Steps to Take
Implement network segmentation, monitor ARP traffic for anomalies, and apply the latest security patches from Cisco to mitigate the vulnerability.
Long-Term Security Practices
Regularly update and patch affected systems, conduct security awareness training, and maintain network security best practices to enhance overall security posture.
Patching and Updates
Apply the latest security updates and patches provided by Cisco to address the vulnerability.