SB2020121730 - Denial of service in F5 BIG-IP CGNAT LSN
Published: December 17, 2020
Security Bulletin ID
SB2020121730
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) Input validation error (CVE-ID: CVE-2020-27720)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to insufficient validation of network traffic in CGNAT LSN when processing NAT66 traffic with Port Block Allocation (PBA) mode and SP-DAG enabled, and dag-ipv6-prefix-len configured with a value less than the default of 128. A remote attacker can pass specially crafted input and cause the Traffic Management Microkernel (TMM) to restart.
Remediation
Install update from vendor's website.