On BIG-IP version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.4, when an authenticated administrative user installs…

published 2020-12-24 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-20231

cvss: 4.9; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.9%; EPSS 0.9% chance of exploitation in 30 days, percentile 58%
public exploits: 0; none known

On BIG-IP version 16.0.0-16.0.0.1, 15.1.0-15.1.0.5, 14.1.0-14.1.3, and 13.1.0-13.1.3.4, when an authenticated administrative user installs RPMs using the iAppsLX REST installer, the BIG-IP system does not sufficiently validate user input, allowing the user read access to the filesystem.

Patch / fix

fixed in 11

f5 big-ip_access_policy_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_advanced_firewall_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_analytics 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_application_acceleration_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_application_security_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_domain_name_system 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_fraud_protection_service 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_global_traffic_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_link_controller 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_local_traffic_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1
f5 big-ip_policy_enforcement_manager 13.1.3.5, 14.1.3.1, 15.1.1, 16.0.1.1

Exploit prediction

0.85% chance of exploitation in the next 30 days, higher than 58% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	4.9	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/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

Classification

Weakness

CWE-20 Improper Input Validation

References

support.f5.com /csp/article/K50343630
vendor-advisory

Sources

CVE List CVE-2020-27727
NVD CVE-2020-27727

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