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CVE-2020-27720

HIGHCVSS 7.5/10EPSS 1.42%

Last modified

CVE-2020-27720 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 1.42% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
1.42%

69.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
F5Big-Ip Carrier-Grade Nat>= 13.1.0, <= 13.1.3
F5Big-Ip Carrier-Grade Nat>= 14.1.0, < 14.1.3.1
F5Big-Ip Carrier-Grade Nat>= 15.1.0, < 15.1.1
F5Big-Ip Carrier-Grade Nat>= 16.0.0, < 16.0.1
F5Big-Ip Local Traffic Manager>= 13.1.0, <= 13.1.3
F5Big-Ip Local Traffic Manager>= 14.1.0, < 14.1.3.1
F5Big-Ip Local Traffic Manager>= 15.1.0, < 15.1.1
F5Big-Ip Local Traffic Manager>= 16.0.0, < 16.0.1

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2020-27720?
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.
How severe is CVE-2020-27720?
CVE-2020-27720 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.42% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27720?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST