In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1 and BIG-IQ versions 5.4.0-7.0.0,…

published 2020-08-26 6y ago modified 2026-06-17 4mo ago also EUVD-2020-27077

cvss: 5.4; 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 42%
public exploits: 0; none known

In BIG-IP versions 15.0.0-15.1.0.4, 14.1.0-14.1.2.6, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1 and BIG-IQ versions 5.4.0-7.0.0, Self-IP port-lockdown bypass via IPv6 link-local addresses.

Patch / fix

fixed in 11

f5 big-ip_access_policy_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_advanced_firewall_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_analytics 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_application_acceleration_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_application_security_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_domain_name_system 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_fraud_protection_service 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_global_traffic_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_link_controller 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_local_traffic_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5
f5 big-ip_policy_enforcement_manager 11.6.5.2, 12.1.5.2, 13.1.3.4, 14.1.2.7, 15.1.0.5

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Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.4	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	2.0	4.8	AV:A/AC:L/Au:N/C:P/I:P/A:N

Affected products

n/a BIG-IP, BIG-IQ

References

support.f5.com /csp/article/K05975972
vendor-advisory

Sources

CVE List CVE-2020-5923
NVD CVE-2020-5923

Fencer Intel 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.