CVE-2020-5923

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-08-26 · updated 2026-06-17

Description

In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1 and BIG-IQ versions 5.4.0-7.0.0, Self-IP port-lockdown bypass via IPv6 link-local addresses.

Affected products

F5 BIG-IP APM: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
BIG-IP: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Big-Ip Analytics: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Networks, Inc. BIG-IP (AAM): from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
BIG-IP ASM: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 BIG-IP DNS: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Big-Ip Fraud Protection Service: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Big-Ip Global Traffic Manager: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Big-Ip Link Controller: from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 BIG-IP (LTM): from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 Networks, Inc. BIG-IP (PEM): from 11.6.1 before 11.6.5.2; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3.4; from 14.1.0 before 14.1.2.7; from 15.0.0 before 15.1.0.5 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
F5 BIG-IQ: from 6.0.0 through 6.1.0; 5.4.0, 7.0.0

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; BIG-IP 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Big-Ip Analytics 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Networks, Inc. BIG-IP (AAM) 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; BIG-IP ASM 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 BIG-IP DNS 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Big-Ip Fraud Protection Service 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Big-Ip Global Traffic Manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Big-Ip Link Controller 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 BIG-IP (LTM) 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7; F5 Networks, Inc. BIG-IP (PEM) 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7. Check the vendor advisory for mitigations.

References

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