CVE-2020-5947 json
In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the…
published 2020-11-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27101
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 53%
- public exploits
- 0
- none known
Summary
In versions 16.0.0-16.0.0.1 and 15.1.0-15.1.1, on specific BIG-IP platforms, attackers may be able to obtain TCP sequence numbers from the BIG-IP system that can be reused in future connections with the same source and destination port and IP numbers. Only these platforms are affected: BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE).
Patch / fix
- f5 big-ip_access_policy_manager 15.1.2, 16.0.1
- f5 big-ip_advanced_firewall_manager 15.1.2, 16.0.1
- f5 big-ip_advanced_web_application_firewall 15.1.2, 16.0.1
- f5 big-ip_analytics 15.1.2, 16.0.1
- f5 big-ip_application_acceleration_manager 15.1.2, 16.0.1
- f5 big-ip_application_security_manager 15.1.2, 16.0.1
- f5 big-ip_ddos_hybrid_defender 15.1.2, 16.0.1
- f5 big-ip_domain_name_system 15.1.2, 16.0.1
- f5 big-ip_fraud_protection_service 15.1.2, 16.0.1
- f5 big-ip_global_traffic_manager 16.0.1
- f5 big-ip_link_controller 15.1.2, 16.0.1
- f5 big-ip_local_traffic_manager 15.1.2, 16.0.1
- f5 big-ip_policy_enforcement_manager 15.1.2, 16.0.1
- f5 ssl_orchestrator 15.1.2, 16.0.1
Exploit prediction
0.70% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.0 | AV:N/AC:L/Au:S/C:P/I:N/A:N |
Affected products
- n/a BIG-IP 2000 series (C112), BIG-IP 4000 series (C113), BIG-IP i2000 series (C117), BIG-IP i4000 series (C115), BIG-IP Virtual Edition (VE)
References
-
support.f5.com
/csp/article/K64571774
vendor-advisory
Sources
- CVE List CVE-2020-5947
- NVD CVE-2020-5947
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.