CVE-2020-3397 : Vulnerability Insights and Analysis
Learn about CVE-2020-3397, a high-severity vulnerability in Cisco NX-OS Software that could allow remote attackers to cause denial of service. Find mitigation steps and impact details here.
A vulnerability in the Border Gateway Protocol (BGP) Multicast VPN (MVPN) implementation of Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause an affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.
Understanding CVE-2020-3397
This CVE involves a denial of service vulnerability in Cisco NX-OS Software due to incomplete input validation of a specific type of BGP MVPN update message.
What is CVE-2020-3397?
The vulnerability allows an attacker to send a specific BGP MVPN update message to a targeted device, causing BGP-related routing applications to restart multiple times, leading to a system-level restart.
The Impact of CVE-2020-3397
- CVSS Base Score: 8.6 (High Severity)
- Attack Vector: Network
- Availability Impact: High
- The vulnerability could result in a denial of service condition by causing affected devices to reload unexpectedly.
Technical Details of CVE-2020-3397
This section provides more in-depth technical information about the vulnerability.
Vulnerability Description
- The vulnerability is a result of incomplete input validation of a specific type of BGP MVPN update message.
Affected Systems and Versions
- Affected Product: Cisco NX-OS Software
- Affected Version: Not applicable (n/a)
Exploitation Mechanism
- An attacker can exploit the vulnerability by sending a specific, valid BGP MVPN update message over an established TCP connection that appears to come from a trusted BGP peer.
Mitigation and Prevention
To address and prevent the exploitation of CVE-2020-3397, consider the following steps:
Immediate Steps to Take
- Implement network segmentation to limit the impact of potential attacks.
- Apply the latest security patches and updates provided by Cisco.
Long-Term Security Practices
- Regularly monitor network traffic for any suspicious activity.
- Conduct security training for network administrators to enhance awareness of potential threats.
Patching and Updates
- Ensure that Cisco NX-OS Software is updated with the latest patches to mitigate the vulnerability effectively.