What is CVE-2020-27720?

CVE-2020-27720 is a high-severity vulnerability in F5 Big-Ip Carrier-Grade Nat. CVSS score: 7.5/10. Published 2020-12-24.

How severe is CVE-2020-27720?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in F5 Big-Ip Carrier-Grade Nat

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.

EPSS: 0.014 (70.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

F5 Big-ip_carrier-grade_nat
F5 Big-ip_local_traffic_manager
N/a 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, 13.1.0-13.1.3.5

References

f5sirt@f5.com (x_refsource_MISC, Vendor Advisory)

Frequently asked questions

What is CVE-2020-27720?: CVE-2020-27720 is a high-severity vulnerability in F5 Big-Ip Carrier-Grade Nat. CVSS score: 7.5/10. Published 2020-12-24.
How severe is CVE-2020-27720?: High severity. CVSS v3 base score is 7.5 out of 10.