CVE-2020-3235 : What You Need to Know

A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software and Cisco IOS XE Software on Catalyst 4500 Series Switches could allow an authenticated, remote attacker to cause a denial of service (DoS) condition.

Understanding CVE-2020-3235

This CVE involves a vulnerability in Cisco IOS and IOS XE Software that could lead to a DoS attack.

What is CVE-2020-3235?

The vulnerability arises from insufficient input validation in processing specific SNMP object identifiers, enabling a remote attacker to trigger a DoS condition by sending a crafted SNMP packet.

The Impact of CVE-2020-3235

CVSS Base Score: 7.7 (High Severity)
Attack Vector: Network
Availability Impact: High
Successful exploitation could lead to a denial of service condition on the affected device.

Technical Details of CVE-2020-3235

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability stems from inadequate input validation in handling SNMP object identifiers within Cisco IOS and IOS XE Software.

Affected Systems and Versions

Affected Product: Cisco IOS 12.2(53)SG1
Vendor: Cisco
Affected Version: n/a

Exploitation Mechanism

An attacker can exploit this vulnerability by sending a specially crafted SNMP packet to the targeted device, causing it to reload and resulting in a DoS condition.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-provided patches or updates promptly.
Implement network segmentation to limit the impact of potential attacks.

Long-Term Security Practices

Regularly monitor and update SNMP configurations.
Enforce strong password policies and access controls.

Patching and Updates

Stay informed about security advisories from Cisco and apply relevant patches.