CVE-2017-3803 : Security Advisory and Response

A vulnerability in the forwarding queue of Cisco 2960X and 3750X switches' IOS Software could lead to a partial denial of service (DoS) attack. Learn about the impact, affected systems, and mitigation steps.

Understanding CVE-2017-3803

What is CVE-2017-3803?

This vulnerability in Cisco IOS Software allows an adjacent, unauthenticated attacker to cause a memory leak in the forwarding queue, resulting in a partial DoS situation.

The Impact of CVE-2017-3803

The vulnerability could be exploited by an attacker to disrupt the normal operation of affected Cisco switches, potentially leading to service interruptions.

Technical Details of CVE-2017-3803

Vulnerability Description

The vulnerability in Cisco IOS Software could be triggered by an unauthorized attacker, causing a memory leak in the forwarding queue and resulting in a partial denial of service.

Affected Systems and Versions

Affected Releases: 15.2(4)E1, 15.2(2)E3

Exploitation Mechanism

An adjacent attacker can exploit the vulnerability to induce a memory leak in the forwarding queue, leading to a DoS condition.

Mitigation and Prevention

Immediate Steps to Take

Apply the provided fixed releases: 15.2(4)E3, 15.2(2)E6, 15.2(5)E1, 15.2(5.3.28i)E1, 15.2(6.0.49i)E, 3.9(1)E
Monitor network traffic for any signs of exploitation

Long-Term Security Practices

Regularly update and patch Cisco IOS Software to prevent known vulnerabilities

Patching and Updates

Stay informed about security advisories and promptly apply patches to secure the network