In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2 and BIG-IQ vers…

published 2020-08-26 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-27071

cvss: 5.9; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 44%
public exploits: 0; none known

In BIG-IP versions 15.1.0-15.1.0.4, 15.0.0-15.0.1.3, 14.1.0-14.1.2.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.2 and BIG-IQ versions 5.2.0-7.0.0, the host OpenSSH servers utilize keys of less than 2048 bits which are no longer considered secure.

Patch / fix

fixed in 11

f5 big-ip_access_policy_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_advanced_firewall_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_analytics 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_application_acceleration_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_application_security_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_domain_name_system 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_fraud_protection_service 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_global_traffic_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_link_controller 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_local_traffic_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5
f5 big-ip_policy_enforcement_manager 12.1.5.2, 14.1.2.4, 15.0.1.4, 15.1.0.5

Exploit prediction

0.52% chance of exploitation in the next 30 days, higher than 44% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.9	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:P/I:N/A:N

Affected products

n/a BIG-IP, BIG-IQ

Classification

Weakness

CWE-326 Inadequate Encryption Strength

References

support.f5.com /csp/article/K43404629
vendor-advisory

Sources

CVE List CVE-2020-5917
NVD CVE-2020-5917

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.

Summary