CVE-2021-23034

HIGH

BIG-IP <16.1.0, 15.1.x <15.1.3.1 - DoS

Title source: llm

Description

On BIG-IP version 16.x before 16.1.0 and 15.1.x before 15.1.3.1, when a DNS profile using a DNS cache resolver is configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

References (1)

[Vendor Advisory] https://support.f5.com/csp/article/K30523121

Scores

CVSS v3 7.5

EPSS 0.0092

EPSS Percentile 75.7%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE

CWE-20 CWE-668

Status published

Affected Products (11)

f5/big-ip_access_policy_manager < 15.1.3.1

f5/big-ip_advanced_firewall_manager < 15.1.3.1

f5/big-ip_analytics < 15.1.3.1

f5/big-ip_application_acceleration_manager < 15.1.3.1

f5/big-ip_application_security_manager < 15.1.3.1

f5/big-ip_domain_name_system < 15.1.3.1

f5/big-ip_fraud_protection_service < 15.1.3.1

f5/big-ip_global_traffic_manager < 15.1.3.1

f5/big-ip_link_controller < 15.1.3.1

f5/big-ip_local_traffic_manager < 15.1.3.1

f5/big-ip_policy_enforcement_manager < 15.1.3.1

Timeline

Published Sep 14, 2021

Tracked Since Feb 18, 2026