CVE-2020-27725

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-24 · updated 2026-06-17
Weakness: CWE-401

Description

In version 15.1.0-15.1.0.5, 14.1.0-14.1.3, 13.1.0-13.1.3.4, 12.1.0-12.1.5.2, and 11.6.1-11.6.5.2 of BIG-IP DNS, GTM, and Link Controller, zxfrd leaks memory when listing DNS zones. Zones can be listed via TMSH, iControl or SNMP; only users with access to those services can trigger this vulnerability.

Affected products

F5 BIG-IP DNS: from 11.6.1 through 11.6.5; from 12.1.0 through 12.1.5; from 13.1.0 before 13.1.3.5; from 14.1.0 before 14.1.3.1; from 15.0.0 before 15.1.1 — fixed in 13.1.3.5, 14.1.3.1, 15.1.1
F5 Big-Ip Global Traffic Manager: from 11.6.1 through 11.6.5; from 12.1.0 through 12.1.5; from 13.1.0 before 13.1.3.5; from 14.1.0 before 14.1.3.1; from 15.0.0 before 15.1.1 — fixed in 13.1.3.5, 14.1.3.1, 15.1.1
F5 Big-Ip Link Controller: from 11.6.1 through 11.6.5; from 12.1.0 through 12.1.5; from 13.1.0 before 13.1.3.5; from 14.1.0 before 14.1.3.1; from 15.0.0 before 15.1.1 — fixed in 13.1.3.5, 14.1.3.1, 15.1.1

How to fix

Upgrade to a fixed version: F5 BIG-IP DNS 13.1.3.5, 14.1.3.1, 15.1.1; F5 Big-Ip Global Traffic Manager 13.1.3.5, 14.1.3.1, 15.1.1; F5 Big-Ip Link Controller 13.1.3.5, 14.1.3.1, 15.1.1. Check the vendor advisory for mitigations.

References

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