CVE-2020-27720
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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Reference Links
Frequently Asked Questions
What is the severity of CVE-2020-27720?
The severity of CVE-2020-27720 is high with a severity value of 7.5.
Which versions of BIG-IP LTM/CGNAT are affected by CVE-2020-27720?
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.
What is the problem with 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.
How can I fix CVE-2020-27720?
To fix CVE-2020-27720, ensure that you have updated BIG-IP LTM/CGNAT to a version that is not affected by this vulnerability.
Where can I find more information about CVE-2020-27720?
You can find more information about CVE-2020-27720 on the F5 Networks support website.
- collector/nvd-index
- agent/author
- agent/severity
- agent/type
- agent/event
- agent/references
- agent/description
- agent/last-modified-date
- agent/tags
- agent/first-publish-date
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- vendor/f5
- canonical/f5 big-ip carrier-grade nat
- version/f5 big-ip carrier-grade nat/13.1.0
- version/f5 big-ip carrier-grade nat/13.1.3
- version/f5 big-ip carrier-grade nat/14.1.0
- version/f5 big-ip carrier-grade nat/15.1.0
- version/f5 big-ip carrier-grade nat/16.0.0
- canonical/f5 big-ip local traffic manager
- version/f5 big-ip local traffic manager/13.1.0
- version/f5 big-ip local traffic manager/13.1.3
- version/f5 big-ip local traffic manager/14.1.0
- version/f5 big-ip local traffic manager/15.1.0
- version/f5 big-ip local traffic manager/16.0.0