CVE-2018-5500

Severity: medium (CVSS 5.9 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-03-01 · updated 2026-06-17
Weakness: CWE-400

Description

On F5 BIG-IP systems running 13.0.0, 12.1.0 - 12.1.3.1, or 11.6.1 - 11.6.2, every Multipath TCP (MCTCP) connection established leaks a small amount of memory. Virtual server using TCP profile with Multipath TCP (MCTCP) feature enabled will be affected by this issue.

Affected products

F5 BIG-IP APM: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
BIG-IP: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Analytics: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Networks, Inc. BIG-IP (AAM): from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
BIG-IP ASM: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Networks, Inc. BIG-IP (DNS): from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Edge Gateway: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Global Traffic Manager: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Link Controller: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 BIG-IP (LTM): from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Networks, Inc. BIG-IP (PEM): from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Webaccelerator: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0
F5 Big-Ip Websafe: from 11.6.1 through 11.6.2; from 12.1.0 through 12.1.3.1; 13.0.0

References

Get alerted when CVE-2018-5500 or the next vulnerability affects your stack