CVE-2021-23039
HIGHCVSS 7.5/10EPSS 0.92%
Last modified
CVE-2021-23039 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.2.8, and all versions of 13.1.x and 12.1.x, when IPSec is configured on a BIG-IP system, undisclosed requests from an authorized remote (IPSec) peer, which already has a negotiated Security Association, can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.. EPSS estimates a 0.92% chance of exploitation in the next 30 days.
Description
On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.2.8, and all versions of 13.1.x and 12.1.x, when IPSec is configured on a BIG-IP system, undisclosed requests from an authorized remote (IPSec) peer, which already has a negotiated Security Association, can cause the Traffic Management Microkernel (TMM) to terminate. 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 | >= 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, < 14.1.2.8 |
| F5 | Big-Ip Access Policy Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Access Policy Manager | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Advanced Firewall Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Advanced Firewall Manager | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Analytics | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Analytics | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Application Acceleration Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Application Acceleration Manager | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Application Security Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Application Security Manager | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Domain Name System | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Domain Name System | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Fraud Protection Service | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Fraud Protection Service | >= 16.0.0, < 16.0.1.2 |
| F5 | Big-Ip Global Traffic Manager | >= 12.1.0, <= 12.1.6 |
| F5 | Big-Ip Global Traffic Manager | >= 13.1.0, <= 13.1.4 |
| F5 | Big-Ip Global Traffic Manager | >= 14.1.0, < 14.1.2.8 |
| F5 | Big-Ip Global Traffic Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Global Traffic Manager | >= 16.0.0, < 16.0.1.2 |
| 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, < 14.1.2.8 |
| F5 | Big-Ip Link Controller | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Link Controller | >= 16.0.0, < 16.0.1.2 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0, <= 12.1.6 |
| F5 | Big-Ip Local Traffic Manager | >= 13.1.0, <= 13.1.4 |
| F5 | Big-Ip Local Traffic Manager | >= 14.1.0, < 14.1.2.8 |
| F5 | Big-Ip Local Traffic Manager | >= 15.1.0, < 15.1.3 |
| F5 | Big-Ip Local Traffic Manager | >= 16.0.0, < 16.0.1.2 |
Showing 50 of 55 affected configurations. See NVD for the full list.
References
- https://support.f5.com/csp/article/K66782293Mitigation, Vendor Advisory
- https://support.f5.com/csp/article/K66782293Mitigation, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-23039?
On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3, 14.1.x before 14.1.2.8, and all versions of 13.1.x and 12.1.x, when IPSec is configured on a BIG-IP system, undisclosed requests from an authorized remote (IPSec) peer, which already has a negotiated Security Association, can cause the Traffic Management Microkernel (TMM) to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
How severe is CVE-2021-23039?
CVE-2021-23039 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.92% probability of exploitation in the next 30 days.
How do I fix CVE-2021-23039?
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.
Related CVEs from 2021
- CVE-2021-23033On BIG-IP Advanced WAF and BIG-IP ASM version 16.x before 16…7.5
- CVE-2021-23034On BIG-IP version 16.x before 16.1.0 and 15.1.x before 15.1.…7.5
- CVE-2021-23035On BIG-IP 14.1.x before 14.1.4.4, when an HTTP profile is co…7.5
- CVE-2021-23036On version 16.0.x before 16.0.1.2, when a BIG-IP ASM and Dat…7.5
- CVE-2021-23037On all versions of 16.1.x, 16.0.x, 15.1.x, 14.1.x, 13.1.x, 1…9.6
- CVE-2021-23038On version 16.0.x before 16.0.1.2, 15.1.x before 15.1.3.1, 1…9
- CVE-2021-2304Vulnerability in the MySQL Server product of Oracle MySQL (c…5.5
- CVE-2021-23040On BIG-IP AFM version 16.0.x before 16.0.1.2, 15.1.x before …8.8
- CVE-2021-23041On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1…6.1
- CVE-2021-23042On BIG-IP version 16.0.x before 16.0.1.2, 15.1.x before 15.1…7.5
- CVE-2021-23043On BIG-IP, on all versions of 16.1.x, 16.0.x, 15.1.x, 14.1.x…6.5
- CVE-2021-23044On BIG-IP version 16.x before 16.1.0, 15.1.x before 15.1.3.1…7.5
Are you affected by CVE-2021-23039?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST