First published: Thu Dec 24 2020(Updated: )
On BIG-IP LTM/CGNAT version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5, 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, an undisclosed traffic pattern may cause the Traffic Management Microkernel (TMM) to restart.
Credit: f5sirt@f5.com
Affected Software | Affected Version | How to fix |
---|---|---|
F5 Big-ip Carrier-grade Nat | >=13.1.0<=13.1.3 | |
F5 Big-ip Carrier-grade Nat | >=14.1.0<14.1.3.1 | |
F5 Big-ip Carrier-grade Nat | >=15.1.0<15.1.1 | |
F5 Big-ip Carrier-grade Nat | >=16.0.0<16.0.1 | |
F5 Big-ip Local Traffic Manager | >=13.1.0<=13.1.3 | |
F5 Big-ip Local Traffic Manager | >=14.1.0<14.1.3.1 | |
F5 Big-ip Local Traffic Manager | >=15.1.0<15.1.1 | |
F5 Big-ip Local Traffic Manager | >=16.0.0<16.0.1 |
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The severity of CVE-2020-27720 is high with a severity value of 7.5.
BIG-IP LTM/CGNAT versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.5 are affected by CVE-2020-27720.
CVE-2020-27720 is related to an undisclosed traffic pattern that can occur 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.
To fix CVE-2020-27720, ensure that you have updated BIG-IP LTM/CGNAT to a version that is not affected by this vulnerability.
You can find more information about CVE-2020-27720 on the F5 Networks support website.