CVE-2020-5856

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: 2020-02-06 · updated 2026-06-17

Description

On BIG-IP 15.0.0-15.0.1.1 and 14.1.0-14.1.2.2, while processing specifically crafted traffic using the default 'xnet' driver, Virtual Edition instances hosted in Amazon Web Services (AWS) may experience a TMM restart.

Affected products

F5 BIG-IP APM: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
BIG-IP: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Big-Ip Analytics: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Networks, Inc. BIG-IP (AAM): from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
BIG-IP ASM: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 BIG-IP DNS: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Big-Ip Fraud Protection Service: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Big-Ip Global Traffic Manager: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Big-Ip Link Controller: from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 BIG-IP (LTM): from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0
F5 Networks, Inc. BIG-IP (PEM): from 14.1.0 before 14.1.2.3; from 15.0.0 before 15.1.0 — fixed in 14.1.2.3, 15.1.0

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 14.1.2.3, 15.1.0; BIG-IP 14.1.2.3, 15.1.0; F5 Big-Ip Analytics 14.1.2.3, 15.1.0; F5 Networks, Inc. BIG-IP (AAM) 14.1.2.3, 15.1.0; BIG-IP ASM 14.1.2.3, 15.1.0; F5 BIG-IP DNS 14.1.2.3, 15.1.0; F5 Big-Ip Fraud Protection Service 14.1.2.3, 15.1.0; F5 Big-Ip Global Traffic Manager 14.1.2.3, 15.1.0; F5 Big-Ip Link Controller 14.1.2.3, 15.1.0; F5 BIG-IP (LTM) 14.1.2.3, 15.1.0; F5 Networks, Inc. BIG-IP (PEM) 14.1.2.3, 15.1.0. Check the vendor advisory for mitigations.

References

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