CVE-2020-5938
MEDIUMCVSS 6.5/10EPSS 0.52%
Last modified
CVE-2020-5938 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.. EPSS estimates a 0.52% chance of exploitation in the next 30 days.
Description
On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.
Metrics
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| F5 | Big-Ip Access Policy Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Access Policy Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Access Policy Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Advanced Firewall Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Advanced Firewall Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Advanced Firewall Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Advanced Web Application Firewall | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Analytics | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Analytics | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Analytics | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Application Acceleration Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Application Acceleration Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Application Acceleration Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Application Security Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Application Security Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Application Security Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Ddos Hybrid Defender | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Domain Name System | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Domain Name System | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Domain Name System | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Fraud Protection Service | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Fraud Protection Service | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Fraud Protection Service | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Global Traffic Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Global Traffic Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Global Traffic Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Link Controller | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Link Controller | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Link Controller | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Local Traffic Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Local Traffic Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Local Traffic Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Big-Ip Policy Enforcement Manager | >= 11.6.1, <= 11.6.5.2 |
| F5 | Big-Ip Policy Enforcement Manager | >= 12.1.0, <= 12.1.5.2 |
| F5 | Big-Ip Policy Enforcement Manager | >= 13.1.0, <= 13.1.3.4 |
| F5 | Ssl Orchestrator | >= 11.6.1, <= 11.6.5.2 |
| F5 | Ssl Orchestrator | >= 12.1.0, <= 12.1.5.2 |
| F5 | Ssl Orchestrator | >= 13.1.0, <= 13.1.3.4 |
References
- https://support.f5.com/csp/article/K76610106Vendor Advisory
- https://support.f5.com/csp/article/K76610106Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-5938?
On BIG-IP 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2, when negotiating IPSec tunnels with configured, authenticated peers, the peer may negotiate a different key length than the BIG-IP configuration would otherwise allow.
How severe is CVE-2020-5938?
CVE-2020-5938 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.52% probability of exploitation in the next 30 days.
How do I fix CVE-2020-5938?
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.
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- CVE-2020-5942In BIG-IP PEM versions 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.…7.5
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