CVE-2021-23009
7.5 · HIGHOverview
CVE-2021-23009 is a high-severity vulnerability affecting f5 big-ip_access_policy_manager. It was published on May 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
On BIG-IP version 16.0.x before 16.0.1.1 and 15.1.x before 15.1.3, malformed HTTP/2 requests may cause an infinite loop which causes a Denial of Service for Data Plane traffic. TMM takes the configured HA action when the TMM process is aborted. There is no control plane exposure, this is a data plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Remediation
Check the references section for vendor advisories and patches from f5. Update big-ip_access_policy_manager to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| f5 | big-ip_access_policy_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_advanced_firewall_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_advanced_web_application_firewall | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_analytics | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_application_acceleration_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_application_security_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_ddos_hybrid_defender | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_domain_name_system | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_fraud_protection_service | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_global_traffic_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_link_controller | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_local_traffic_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_policy_enforcement_manager | >= 15.1.0, < 15.1.3 | Affected |
| f5 | big-ip_ssl_orchestrator | >= 15.1.0, < 15.1.3 | Affected |
Frequently Asked Questions
What is CVE-2021-23009?
CVE-2021-23009 is a high-severity vulnerability affecting f5 big-ip_access_policy_manager. It was published on May 10, 2021 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2021-23009?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-23009?
Check the references section for vendor advisories and patches from f5. Update big-ip_access_policy_manager to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-23009?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-23009 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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