CVE-2021-22984

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-12 · updated 2026-06-17
Weakness: CWE-601

Description

On BIG-IP Advanced WAF and ASM version 15.1.x before 15.1.0.2, 15.0.x before 15.0.1.4, 14.1.x before 14.1.2.5, 13.1.x before 13.1.3.4, 12.1.x before 12.1.5.2, and 11.6.x before 11.6.5.2, when receiving a unauthenticated client request with a maliciously crafted URI, a BIG-IP Advanced WAF or ASM virtual server configured with a DoS profile with Proactive Bot Defense (versions prior to 14.1.0), or a Bot Defense profile (versions 14.1.0 and later), may subject clients and web servers to Open Redirection attacks. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

Affected products

F5 Big-Ip Advanced Web Application Firewall: 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 14.1.2.5; from 15.0.0 before 15.0.1.4; from 15.1.0 before 15.1.0.2 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.5, 15.0.1.4, 15.1.0.2
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 14.1.2.5; from 15.0.0 before 15.0.1.4; from 15.1.0 before 15.1.0.2 — fixed in 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.5, 15.0.1.4, 15.1.0.2

How to fix

Upgrade to a fixed version: F5 Big-Ip Advanced Web Application Firewall 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.5; BIG-IP ASM 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.5. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2021-22984 or the next vulnerability affects your stack