CVE-2020-5921
HIGHCVSS 7.5/10EPSS 1.04%
Last modified
CVE-2020-5921 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. EPSS estimates a 1.04% chance of exploitation in the next 30 days.
Description
in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. Single-blade VIPRION hosts are not affected.
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 | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Access Policy Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Access Policy Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Access Policy Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Advanced Firewall Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Advanced Firewall Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Analytics | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Analytics | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Analytics | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Analytics | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Application Acceleration Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Application Acceleration Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Application Security Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Application Security Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Application Security Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Domain Name System | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Domain Name System | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Domain Name System | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Domain Name System | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Fraud Protection Service | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Fraud Protection Service | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Fraud Protection Service | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Global Traffic Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Global Traffic Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Global Traffic Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Global Traffic Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Link Controller | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Link Controller | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Link Controller | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Link Controller | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Local Traffic Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Local Traffic Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Local Traffic Manager | >= 15.1.0, < 15.1.0.5 |
| F5 | Big-Ip Policy Enforcement Manager | >= 12.1.0, < 12.1.5.2 |
| F5 | Big-Ip Policy Enforcement Manager | >= 14.1.0, < 14.1.2.7 |
| F5 | Big-Ip Policy Enforcement Manager | >= 15.0.0, < 15.0.1.4 |
| F5 | Big-Ip Policy Enforcement Manager | >= 15.1.0, < 15.1.0.5 |
References
- https://support.f5.com/csp/article/K00103216Vendor Advisory
- https://support.f5.com/csp/article/K00103216Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-5921?
in BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.6, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2, Syn flood causes large number of MCPD context messages destined to secondary blades consuming memory leading to MCPD failure. This issue affects only VIPRION hosts with two or more blades installed. Single-blade VIPRION hosts are not affected.
How severe is CVE-2020-5921?
CVE-2020-5921 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.
How do I fix CVE-2020-5921?
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 2020
- CVE-2020-5915In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-…6.1
- CVE-2020-5916In BIG-IP versions 15.1.0-15.1.0.4 and 15.0.0-15.0.1.3 the C…6.8
- CVE-2020-5917In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-…5.9
- CVE-2020-5918In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-…7.5
- CVE-2020-5919In versions 15.1.0-15.1.0.4, rendering of certain session va…7.5
- CVE-2020-5920In versions 15.0.0-15.1.0.5, 14.1.0-14.1.2.7, 13.1.0-13.1.3.…4.3
- CVE-2020-5922In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-…8.8
- CVE-2020-5923In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-…5.4
- CVE-2020-5924In BIG-IP APM versions 12.1.0-12.1.5.1 and 11.6.1-11.6.5.2, …5.3
- CVE-2020-5925In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-…7.5
- CVE-2020-5926In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, and 14.…7.5
- CVE-2020-5927In versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, and 14.1.0-14.…6.1
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