CVE-2020-5876

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-04-30 · updated 2026-06-17
Weakness: CWE-319

Description

On BIG-IP 15.0.0-15.0.1.3, 14.1.0-14.1.2.3, 13.1.0-13.1.3.3, 12.1.0-12.1.5.1, and 11.6.1-11.6.5.1, a race condition exists where mcpd and other processes may make unencrypted connection attempts to a new configuration sync peer. The race condition can occur when changing the ConfigSync IP address of a peer, adding a new peer, or when the Traffic Management Microkernel (TMM) first starts up.

Affected products

F5 BIG-IP APM: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
BIG-IP: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Big-Ip Analytics: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Networks, Inc. BIG-IP (AAM): from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
BIG-IP ASM: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 BIG-IP DNS: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Big-Ip Fraud Protection Service: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Big-Ip Global Traffic Manager: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Big-Ip Link Controller: from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 BIG-IP (LTM): from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3
F5 Networks, Inc. BIG-IP (PEM): from 11.6.1 through 11.6.5.1; from 12.1.0 through 12.1.5.1; from 13.1.0 through 13.1.3.3; from 14.1.0 through 14.1.2.3; from 15.0.0 through 15.1.0.3

References

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