CVE-2018-5506

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-04-13 · updated 2026-06-17

Description

In F5 BIG-IP 13.0.0, 12.1.0-12.1.2, 11.6.1, 11.5.1-11.5.5, or 11.2.1 the Apache modules apache_auth_token_mod and mod_auth_f5_auth_token.cpp allow possible unauthenticated bruteforce on the em_server_ip authorization parameter to obtain which SSL client certificates used for mutual authentication between BIG-IQ or Enterprise Manager (EM) and managed BIG-IP devices.

Affected products

F5 BIG-IP APM: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
BIG-IP: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Analytics: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Networks, Inc. BIG-IP (AAM): from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
BIG-IP ASM: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 BIG-IP DNS: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Edge Gateway: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Global Traffic Manager: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Link Controller: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 BIG-IP (LTM): from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Networks, Inc. BIG-IP (PEM): from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Webaccelerator: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0
F5 Big-Ip Websafe: from 11.5.1 through 11.5.5; from 12.1.0 through 12.1.3.1; 11.2.1, 11.6.1, 13.0.0

References

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