high
7.5
CWE
400
Advisory Published
Updated

CVE-2021-23011

First published: Mon May 10 2021(Updated: )

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.

Credit: f5sirt@f5.com

Affected SoftwareAffected VersionHow to fix
F5 Access Policy Manager>=11.6.1<11.6.5.3
F5 Access Policy Manager>=12.1.0<12.1.6
F5 Access Policy Manager>=13.1.0<13.1.4
F5 Access Policy Manager>=14.1.0<14.1.4
F5 Access Policy Manager>=15.1.0<15.1.3
F5 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 WAF/ASM>=11.6.1<11.6.5.3
F5 BIG-IP Advanced WAF/ASM>=12.1.0<12.1.6
F5 BIG-IP Advanced WAF/ASM>=13.1.0<13.1.4
F5 BIG-IP Advanced WAF/ASM>=14.1.0<14.1.4
F5 BIG-IP Advanced WAF/ASM>=15.1.0<15.1.3
F5 BIG-IP Advanced WAF/ASM>=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 Application Security Manager>=11.6.1<11.6.5.3
F5 Application Security Manager>=12.1.0<12.1.6
F5 Application Security Manager>=13.1.0<13.1.4
F5 Application Security Manager>=14.1.0<14.1.4
F5 Application Security Manager>=15.1.0<15.1.3
F5 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>=11.6.1<11.6.5.3
F5 BIG-IP>=12.1.0<12.1.6
F5 BIG-IP>=13.1.0<13.1.4
F5 BIG-IP>=14.1.0<14.1.4
F5 BIG-IP>=15.1.0<15.1.3
F5 BIG-IP>=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
F5 BIG-IP Fraud Protection Service>=13.1.0<13.1.4
F5 BIG-IP Fraud Protection Service>=14.1.0<14.1.4
F5 BIG-IP Fraud Protection Service>=15.1.0<15.1.3
F5 BIG-IP Fraud Protection Service>=16.0.0<16.0.1.1
Riverbed SteelApp Traffic Manager>=11.6.1<11.6.5.3
Riverbed SteelApp Traffic Manager>=12.1.0<12.1.6
Riverbed SteelApp Traffic Manager>=13.1.0<13.1.4
Riverbed SteelApp Traffic Manager>=14.1.0<14.1.4
Riverbed SteelApp Traffic Manager>=15.1.0<15.1.3
Riverbed SteelApp Traffic Manager>=16.0.0<16.0.1.1
F5 BIG-IP Link Controller>=11.6.1<11.6.5.3
F5 BIG-IP Link Controller>=12.1.0<12.1.6
F5 BIG-IP Link Controller>=13.1.0<13.1.4
F5 BIG-IP Link Controller>=14.1.0<14.1.4
F5 BIG-IP Link Controller>=15.1.0<15.1.3
F5 BIG-IP Link Controller>=16.0.0<16.0.1.1
Riverbed SteelApp Traffic Manager>=11.6.1<11.6.5.3
Riverbed SteelApp Traffic Manager>=12.1.0<12.1.6
Riverbed SteelApp Traffic Manager>=13.1.0<13.1.4
Riverbed SteelApp Traffic Manager>=14.1.0<14.1.4
Riverbed SteelApp Traffic Manager>=15.1.0<15.1.3
Riverbed SteelApp Traffic Manager>=16.0.0<16.0.1.1
F5 BIG-IP Policy Enforcement Manager>=11.6.1<11.6.5.3
F5 BIG-IP Policy Enforcement Manager>=12.1.0<12.1.6
F5 BIG-IP Policy Enforcement Manager>=13.1.0<13.1.4
F5 BIG-IP Policy Enforcement Manager>=14.1.0<14.1.4
F5 BIG-IP Policy Enforcement Manager>=15.1.0<15.1.3
F5 BIG-IP Policy Enforcement Manager>=16.0.0<16.0.1.1
F5 BIG-IP SSL Orchestrator>=11.6.1<11.6.5.3
F5 BIG-IP SSL Orchestrator>=12.1.0<12.1.6
F5 BIG-IP SSL Orchestrator>=13.1.0<13.1.4
F5 BIG-IP SSL Orchestrator>=14.1.0<14.1.4
F5 BIG-IP SSL Orchestrator>=15.1.0<15.1.3
F5 BIG-IP SSL Orchestrator>=16.0.0<16.0.1.1

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Frequently Asked Questions

  • What is the severity of CVE-2021-23011?

    CVE-2021-23011 is categorized as a medium severity vulnerability.

  • How do I fix CVE-2021-23011?

    To fix CVE-2021-23011, upgrade your F5 BIG-IP software to the appropriate version that is not affected by this vulnerability.

  • What systems are affected by CVE-2021-23011?

    CVE-2021-23011 affects F5 BIG-IP versions before 16.0.1.1, 15.1.3, 14.1.4, 13.1.4, 12.1.6, and 11.6.5.3.

  • What is the cause of CVE-2021-23011?

    CVE-2021-23011 is caused by the Traffic Management Microkernel (TMM) consuming excessive resources when buffering packet fragments.

  • Is there a workaround for CVE-2021-23011?

    While upgrading is the recommended solution, temporarily adjusting resource allocation may provide limited relief until a full upgrade can be performed.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203