CVE-2021-23008
Last modified
CVE-2021-23008 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. On version 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, 12.1.x before 12.1.6, and all versions of 16.0.x and 11.6.x., BIG-IP APM AD (Active Directory) authentication can be bypassed via a spoofed AS-REP (Kerberos Authentication Service Response) response sent over a hijacked KDC (Kerberos Key Distribution Center) connection or from an AD server compromised by an attacker. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 1.33% chance of exploitation in the next 30 days.
Description
On version 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.4, 12.1.x before 12.1.6, and all versions of 16.0.x and 11.6.x., BIG-IP APM AD (Active Directory) authentication can be bypassed via a spoofed AS-REP (Kerberos Authentication Service Response) response sent over a hijacked KDC (Kerberos Key Distribution Center) connection or from an AD server compromised by an attacker. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 11.5.2, < 11.6.5 |
| F5 | Big-Ip Access Policy Manager | >= 12.1.0, < 12.1.5 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, < 13.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 14.1.0, < 14.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 15.0.0, < 15.1.2 |
| F5 | Big-Ip Access Policy Manager | >= 16.0.0, < 16.0.1 |
References
- https://support.f5.com/csp/article/K51213246Vendor Advisory
- https://support.f5.com/csp/article/K51213246Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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