CVE-2021-23011
HIGHCVSS 7.5/10EPSS 0.96%
Last modified
CVE-2021-23011 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On versions 16.0.x before 16.0.1.1, 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 11.6.x before 11.6.5.3, when the BIG-IP system is buffering packet fragments for reassembly, the Traffic Management Microkernel (TMM) may consume an excessive amount of resources, eventually leading to a restart and failover event. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.96% chance of exploitation in the next 30 days.
Description
On versions 16.0.x before 16.0.1.1, 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 11.6.x before 11.6.5.3, when the BIG-IP system is buffering packet fragments for reassembly, the Traffic Management Microkernel (TMM) may consume an excessive amount of resources, eventually leading to a restart and failover event. 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:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Access Policy Manager | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Access Policy Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Access Policy Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Advanced Firewall Manager | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Analytics | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Analytics | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Analytics | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Analytics | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Analytics | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Analytics | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Application Acceleration Manager | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Application Security Manager | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Application Security Manager | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Application Security Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Application Security Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Application Security Manager | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Domain Name System | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Domain Name System | >= 12.1.0, < 12.1.6 |
| F5 | Big-Ip Domain Name System | >= 13.1.0, < 13.1.4 |
| F5 | Big-Ip Domain Name System | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Domain Name System | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Domain Name System | >= 16.0.0, < 16.0.1.1 |
| F5 | Big-Ip Fraud Protection Service | >= 11.6.1, < 11.6.5.3 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0, < 12.1.6 |
Showing 50 of 84 affected configurations. See NVD for the full list.
References
- https://support.f5.com/csp/article/K10751325Vendor Advisory
- https://support.f5.com/csp/article/K10751325Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23011?
On versions 16.0.x before 16.0.1.1, 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 11.6.x before 11.6.5.3, when the BIG-IP system is buffering packet fragments for reassembly, the Traffic Management Microkernel (TMM) may consume an excessive amount of resources, eventually leading to a restart and failover event. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2021-23011?
CVE-2021-23011 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.96% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23011?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-23011?
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Scan your code nowSource: NVD / NIST