CVE-2021-23004
HIGHCVSS 7.5/10EPSS 0.96%
Last modified
CVE-2021-23004 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, Multipath TCP (MPTCP) forwarding flows may be created on standard virtual servers without MPTCP enabled in the applied TCP profile. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.. EPSS estimates a 0.96% chance of exploitation in the next 30 days.
Description
On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, Multipath TCP (MPTCP) forwarding flows may be created on standard virtual servers without MPTCP enabled in the applied TCP profile. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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, < 12.1.5.3 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Access Policy Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Access Policy Manager | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Advanced Firewall Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Analytics | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Analytics | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Analytics | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Application Acceleration Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Application Security Manager | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Application Security Manager | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Application Security Manager | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
| F5 | Big-Ip Domain Name System | >= 13.1.0, < 13.1.3.6 |
| F5 | Big-Ip Domain Name System | >= 14.1.0, < 14.1.4 |
| F5 | Big-Ip Domain Name System | >= 15.1.0, < 15.1.2.1 |
| 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, < 12.1.5.3 |
Showing 50 of 84 affected configurations. See NVD for the full list.
References
- https://support.f5.com/csp/article/K31025212Vendor Advisory
- https://support.f5.com/csp/article/K31025212Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23004?
On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2, 14.1.x before 14.1.3.1, 13.1.x before 13.1.3.6, 12.1.x before 12.1.5.3, and 11.6.x before 11.6.5.3, Multipath TCP (MPTCP) forwarding flows may be created on standard virtual servers without MPTCP enabled in the applied TCP profile. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.
How severe is CVE-2021-23004?
CVE-2021-23004 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-2021-23004?
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-2021-23004?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST