SB2020121727 - Denial of service in F5 BIG-IP DNS virtual server
Published: December 17, 2020
Security Bulletin ID
SB2020121727
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Resource management error (CVE-ID: CVE-2020-27721)
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.
Remediation
Install update from vendor's website.