CVE-2020-5939

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-11-05 · updated 2026-06-17

Description

In versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.3, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, and 13.1.0-13.1.3.4, BIG-IP Virtual Edition (VE) systems on VMware, with an Intel-based 85299 Network Interface Controller (NIC) card and Single Root I/O Virtualization (SR-IOV) enabled on vSphere, may fail and leave the Traffic Management Microkernel (TMM) in a state where it cannot transmit traffic.

Affected products

F5 BIG-IP APM: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
BIG-IP: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Advanced Web Application Firewall: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 (excl.) before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Analytics: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Networks, Inc. BIG-IP (AAM): from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
BIG-IP ASM: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Ddos Hybrid Defender: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 BIG-IP DNS: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Fraud Protection Service: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Global Traffic Manager: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Link Controller: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 BIG-IP (LTM): from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Networks, Inc. BIG-IP (PEM): from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1
F5 Big-Ip Ssl Orchestrator: from 13.1.0 through 13.1.3; from 14.1.0 before 14.1.2.7; from 15.1.0 before 15.1.0.4; from 16.0.0 before 16.0.1 — fixed in 14.1.2.7, 15.1.0.4, 16.0.1

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 14.1.2.7, 15.1.0.4, 16.0.1; BIG-IP 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Advanced Web Application Firewall 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Analytics 14.1.2.7, 15.1.0.4, 16.0.1; F5 Networks, Inc. BIG-IP (AAM) 14.1.2.7, 15.1.0.4, 16.0.1; BIG-IP ASM 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Ddos Hybrid Defender 14.1.2.7, 15.1.0.4, 16.0.1; F5 BIG-IP DNS 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Fraud Protection Service 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Global Traffic Manager 14.1.2.7, 15.1.0.4, 16.0.1; F5 Big-Ip Link Controller 14.1.2.7, 15.1.0.4, 16.0.1; F5 BIG-IP (LTM) 14.1.2.7, 15.1.0.4, 16.0.1. Check the vendor advisory for mitigations.

References

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