CVE-2019-1977 : Vulnerability Insights and Analysis

Cisco Nexus 9000 Series Fabric Switches ACI Mode Border Leaf Endpoint Learning Vulnerability

Understanding CVE-2019-1977

This CVE involves a vulnerability in the Endpoint Learning feature of Cisco Nexus 9000 Series Switches running in Application Centric Infrastructure (ACI) mode, potentially leading to a denial of service (DoS) situation.

What is CVE-2019-1977?

The vulnerability arises when the endpoint learning process fails to execute correctly, affecting traffic flow to specific endpoint devices in certain scenarios.

The Impact of CVE-2019-1977

The vulnerability could be exploited by an unauthenticated remote attacker, causing a DoS condition on an endpoint device. However, there have been no reported public exploits or malicious activities related to this vulnerability.

Technical Details of CVE-2019-1977

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability occurs in the Endpoint Learning feature of Cisco Nexus 9000 Series Switches in ACI mode, affecting traffic flow to endpoints on border leaf switches.

Affected Systems and Versions

Product: Cisco Nexus 9000 Series Fabric Switches in ACI
Vendor: Cisco
Versions Affected: Less than 12.2(4M)

Exploitation Mechanism

Attack Complexity: High
Attack Vector: Network
Availability Impact: High
Base Score: 6.8 (Medium Severity)
Vector String: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H

Mitigation and Prevention

Protecting systems from CVE-2019-1977 is crucial to maintaining network security.

Immediate Steps to Take

Apply vendor-recommended patches or updates promptly.
Monitor network traffic for any suspicious activity.

Long-Term Security Practices

Regularly update and patch all network devices.
Implement network segmentation to limit the impact of potential vulnerabilities.

Patching and Updates

Stay informed about security advisories from Cisco.
Implement a robust network security policy to prevent unauthorized access.