CVE-2025-21091: BIG-IP SNMP vulnerability

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-02-05 · updated 2026-06-17
Weakness: CWE-401

Description

When SNMP v1 or v2c are disabled on the BIG-IP, undisclosed requests can cause an increase in memory resource utilization. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated

Affected products

F5 BIG-IP APM: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
BIG-IP: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Advanced Web Application Firewall: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Analytics: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Networks, Inc. BIG-IP (AAM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
BIG-IP ASM: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Application Visibility And Reporting: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Automation Toolchain: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Carrier-Grade Nat: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 BIG-IP Container Ingress Services: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Ddos Hybrid Defender: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 BIG-IP DNS: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Edge Gateway: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Fraud Protection Service: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Global Traffic Manager: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Link Controller: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 BIG-IP (LTM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Networks, Inc. BIG-IP (PEM): from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Ssl Orchestrator: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Webaccelerator: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2
F5 Big-Ip Websafe: from 15.1.0 through 15.1.10; from 16.1.0 before 16.1.6; from 17.1.0 before 17.1.2 — fixed in 16.1.6, 17.1.2

How to fix

Upgrade to a fixed version: F5 BIG-IP APM 16.1.6, 17.1.2; BIG-IP 16.1.6, 17.1.2; F5 Big-Ip Advanced Web Application Firewall 16.1.6, 17.1.2; F5 Big-Ip Analytics 16.1.6, 17.1.2; F5 Networks, Inc. BIG-IP (AAM) 16.1.6, 17.1.2; BIG-IP ASM 16.1.6, 17.1.2; F5 Big-Ip Application Visibility And Reporting 16.1.6, 17.1.2; F5 Big-Ip Automation Toolchain 16.1.6, 17.1.2; F5 Big-Ip Carrier-Grade Nat 16.1.6, 17.1.2; F5 BIG-IP Container Ingress Services 16.1.6, 17.1.2; F5 Big-Ip Ddos Hybrid Defender 16.1.6, 17.1.2; F5 BIG-IP DNS 16.1.6, 17.1.2. Check the vendor advisory for mitigations.

References

https://my.f5.com/manage/s/article/K000140933

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