CVE-2020-5913

Severity: high (CVSS 7.4 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
Weakness: CWE-295

Description

In versions 15.0.0-15.1.0.1, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, the BIG-IP Client or Server SSL profile ignores revoked certificates, even when a valid CRL is present. This impacts SSL/TLS connections and may result in a man-in-the-middle attack on the connections.

Affected products

F5 BIG-IP APM: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
BIG-IP: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Advanced Web Application Firewall: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Analytics: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Networks, Inc. BIG-IP (AAM): from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
BIG-IP ASM: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Ddos Hybrid Defender: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 BIG-IP DNS: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Fraud Protection Service: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Global Traffic Manager: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Big-Ip Link Controller: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 BIG-IP (LTM): from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 Networks, Inc. BIG-IP (PEM): from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2
F5 SSL Orchestrator: from 11.6.1 before 11.6.5; from 12.1.0 before 12.1.5.2; from 13.1.0 before 13.1.3; from 14.1.0 before 14.1.2-0.89.37; from 14.1.2.1 before 14.1.2.5; from 15.0.0 before 15.0.1.2 — fixed in 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37, 14.1.2.5, 15.0.1.2

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; BIG-IP 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Advanced Web Application Firewall 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Analytics 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Networks, Inc. BIG-IP (AAM) 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; BIG-IP ASM 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Ddos Hybrid Defender 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 BIG-IP DNS 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Fraud Protection Service 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Global Traffic Manager 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 Big-Ip Link Controller 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37; F5 BIG-IP (LTM) 11.6.5, 12.1.5.2, 13.1.3, 14.1.2-0.89.37. Check the vendor advisory for mitigations.

References

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