CVE-2021-22975

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: 2021-02-12 · updated 2026-06-17

Description

On BIG-IP version 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, and 14.1.x before 14.1.3.1, under some circumstances, Traffic Management Microkernel (TMM) may restart on the BIG-IP system while passing large bursts of traffic. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected products

F5 BIG-IP APM: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
BIG-IP: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Advanced Web Application Firewall: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Analytics: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Networks, Inc. BIG-IP (AAM): from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
BIG-IP ASM: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Ddos Hybrid Defender: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 BIG-IP DNS: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Fraud Protection Service: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Global Traffic Manager: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Link Controller: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 BIG-IP (LTM): from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Networks, Inc. BIG-IP (PEM): from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1
F5 Big-Ip Ssl Orchestrator: from 14.1.0 before 14.1.3.1; from 15.1.0 before 15.1.2.1; from 16.0.0 before 16.0.1.1 — fixed in 14.1.3.1, 15.1.2.1, 16.0.1.1

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 14.1.3.1, 15.1.2.1, 16.0.1.1; BIG-IP 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Advanced Web Application Firewall 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Analytics 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Networks, Inc. BIG-IP (AAM) 14.1.3.1, 15.1.2.1, 16.0.1.1; BIG-IP ASM 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Ddos Hybrid Defender 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 BIG-IP DNS 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Fraud Protection Service 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Global Traffic Manager 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 Big-Ip Link Controller 14.1.3.1, 15.1.2.1, 16.0.1.1; F5 BIG-IP (LTM) 14.1.3.1, 15.1.2.1, 16.0.1.1. Check the vendor advisory for mitigations.

References

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