Main Vulnerability Database Vulnerabilities #VU49071

#VU49071 Resource management error in BIG-IP DNS and BIG-IP GTM - CVE-2020-27721

Published: December 17, 2020

Vulnerability identifier: #VU49071

Vulnerability risk: Medium

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

CVE-ID: CVE-2020-27721

CWE-ID: CWE-399

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
BIG-IP DNS
BIG-IP GTM

Software vendor:
F5 Networks

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the BIG-IP DNS system.

This can occur under the following conditions:

You configure connection rate limiting by either source or destination address for a BIG-IP LTM virtual server.
The configured connection rate limit is exceeded on the BIG-IP LTM virtual server (or Pool Member or Node), and the status of the virtual server on the Configuration utility becomes yellow.

A remote attacker can send specially crafted data to the service and perform a denial of service (DoS) attack.

Install updates from vendor's website.