CVE-2021-1394 : Exploit Details and Defense Strategies

A vulnerability in the ingress traffic manager of Cisco IOS XE Software for Cisco Network Convergence System (NCS) 520 Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition in the web management interface of an affected device.

Understanding CVE-2021-1394

This CVE affects Cisco IOS XE Software for Network Convergence System 520 Routers, potentially leading to a denial of service attack through the web management interface.

What is CVE-2021-1394?

The vulnerability arises from incorrect processing of certain IPv4 TCP traffic directed at the affected device.

The Impact of CVE-2021-1394

If exploited, this vulnerability could make the web management interface of the device unavailable, resulting in a DoS condition.

Technical Details of CVE-2021-1394

This section delves into the specific technical aspects of the vulnerability.

Vulnerability Description

The vulnerability stems from the mishandling of IPv4 TCP traffic, allowing attackers to disrupt the web management interface.

Affected Systems and Versions

Product: Cisco IOS XE Software
Vendor: Cisco
Versions affected: Not applicable

Exploitation Mechanism

By sending a large number of crafted TCP packets to the affected device, an attacker could trigger the DoS condition.

Mitigation and Prevention

To safeguard systems from CVE-2021-1394, certain steps can be taken.

Immediate Steps to Take

Implement network security controls and filters to prevent unauthorized access to the web management interface.

Long-Term Security Practices

Regularly monitor network traffic and apply security updates promptly to address vulnerabilities.

Patching and Updates

Check with the vendor's security advisories regularly for patches and updates to mitigate this vulnerability.