CVE-2019-16027 : Vulnerability Insights and Analysis

Cisco IOS XR Software Intermediate System–to–Intermediate System Denial of Service Vulnerability

Understanding CVE-2019-16027

This CVE involves a vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS-IS) routing protocol in Cisco IOS XR Software, potentially leading to a denial of service (DoS) situation.

What is CVE-2019-16027?

The vulnerability arises from incorrect handling of Simple Network Management Protocol (SNMP) requests for specific Object Identifiers (OIDs) by the IS-IS process, allowing an authenticated remote attacker to trigger a DoS condition in the IS-IS process.

The Impact of CVE-2019-16027

The vulnerability could be exploited by sending a carefully-crafted SNMP request to the affected device, resulting in a DoS situation within the IS-IS process. The base severity score is high at 7.7.

Technical Details of CVE-2019-16027

Vulnerability Description

The vulnerability in Cisco IOS XR Software allows an authenticated attacker to exploit the IS-IS routing protocol, causing a DoS condition due to mishandling of SNMP requests.

Affected Systems and Versions

Product: Cisco IOS XR Software
Vendor: Cisco
Versions: Unspecified

Exploitation Mechanism

Attacker sends a crafted SNMP request to the affected device
Successful exploitation leads to a DoS condition in the IS-IS process

Mitigation and Prevention

Immediate Steps to Take

Apply the necessary security patches provided by Cisco
Monitor network traffic for any suspicious SNMP requests

Long-Term Security Practices

Regularly update and patch all software and firmware
Implement network segmentation and access controls

Patching and Updates

Refer to Cisco's security advisory for specific patch details and instructions