CVE-2025-21091

HIGH

Published Feb 5, 2025 Modified Oct 21, 2025 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

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CVSS v3.1 Score

7.5

HIGH

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

Weakness Type (CWE)

CWE-401 CWE-401

Affected Products

Vendor	Product	Versions
f5	big-ip_access_policy_manager	15.1.0 — 15.1.10
f5	big-ip_advanced_firewall_manager	15.1.0 — 15.1.10
f5	big-ip_advanced_web_application_firewall	15.1.0 — 15.1.10
f5	big-ip_analytics	15.1.0 — 15.1.10
f5	big-ip_application_acceleration_manager	15.1.0 — 15.1.10
f5	big-ip_application_security_manager	15.1.0 — 15.1.10
f5	big-ip_application_visibility_and_reporting	15.1.0 — 15.1.10
f5	big-ip_automation_toolchain	15.1.0 — 15.1.10
f5	big-ip_carrier-grade_nat	15.1.0 — 15.1.10
f5	big-ip_container_ingress_services	15.1.0 — 15.1.10
f5	big-ip_ddos_hybrid_defender	15.1.0 — 15.1.10
f5	big-ip_domain_name_system	15.1.0 — 15.1.10
f5	big-ip_edge_gateway	15.1.0 — 15.1.10
f5	big-ip_fraud_protection_service	15.1.0 — 15.1.10
f5	big-ip_global_traffic_manager	15.1.0 — 15.1.10
f5	big-ip_link_controller	15.1.0 — 15.1.10
f5	big-ip_local_traffic_manager	15.1.0 — 15.1.10
f5	big-ip_policy_enforcement_manager	15.1.0 — 15.1.10
f5	big-ip_ssl_orchestrator	15.1.0 — 15.1.10
f5	big-ip_webaccelerator	15.1.0 — 15.1.10
f5	big-ip_websafe	15.1.0 — 15.1.10
f5	big-ip_access_policy_manager	16.1.0 — 16.1.6
f5	big-ip_advanced_firewall_manager	16.1.0 — 16.1.6
f5	big-ip_advanced_web_application_firewall	16.1.0 — 16.1.6
f5	big-ip_analytics	16.1.0 — 16.1.6
f5	big-ip_application_acceleration_manager	16.1.0 — 16.1.6
f5	big-ip_application_security_manager	16.1.0 — 16.1.6
f5	big-ip_application_visibility_and_reporting	16.1.0 — 16.1.6
f5	big-ip_automation_toolchain	16.1.0 — 16.1.6
f5	big-ip_carrier-grade_nat	16.1.0 — 16.1.6
f5	big-ip_container_ingress_services	16.1.0 — 16.1.6
f5	big-ip_ddos_hybrid_defender	16.1.0 — 16.1.6
f5	big-ip_domain_name_system	16.1.0 — 16.1.6
f5	big-ip_edge_gateway	16.1.0 — 16.1.6
f5	big-ip_fraud_protection_service	16.1.0 — 16.1.6
f5	big-ip_global_traffic_manager	16.1.0 — 16.1.6
f5	big-ip_link_controller	16.1.0 — 16.1.6
f5	big-ip_local_traffic_manager	16.1.0 — 16.1.6
f5	big-ip_policy_enforcement_manager	16.1.0 — 16.1.6
f5	big-ip_ssl_orchestrator	16.1.0 — 16.1.6
f5	big-ip_webaccelerator	16.1.0 — 16.1.6
f5	big-ip_websafe	16.1.0 — 16.1.6
f5	big-ip_access_policy_manager	17.1.0 — 17.1.2
f5	big-ip_advanced_firewall_manager	17.1.0 — 17.1.2
f5	big-ip_advanced_web_application_firewall	17.1.0 — 17.1.2
f5	big-ip_analytics	17.1.0 — 17.1.2
f5	big-ip_application_acceleration_manager	17.1.0 — 17.1.2
f5	big-ip_application_security_manager	17.1.0 — 17.1.2
f5	big-ip_application_visibility_and_reporting	17.1.0 — 17.1.2
f5	big-ip_automation_toolchain	17.1.0 — 17.1.2
f5	big-ip_carrier-grade_nat	17.1.0 — 17.1.2
f5	big-ip_container_ingress_services	17.1.0 — 17.1.2
f5	big-ip_ddos_hybrid_defender	17.1.0 — 17.1.2
f5	big-ip_domain_name_system	17.1.0 — 17.1.2
f5	big-ip_edge_gateway	17.1.0 — 17.1.2
f5	big-ip_fraud_protection_service	17.1.0 — 17.1.2
f5	big-ip_global_traffic_manager	17.1.0 — 17.1.2
f5	big-ip_link_controller	17.1.0 — 17.1.2
f5	big-ip_local_traffic_manager	17.1.0 — 17.1.2
f5	big-ip_policy_enforcement_manager	17.1.0 — 17.1.2
f5	big-ip_ssl_orchestrator	17.1.0 — 17.1.2
f5	big-ip_webaccelerator	17.1.0 — 17.1.2
f5	big-ip_websafe	17.1.0 — 17.1.2

References

Advisories & Patches

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

Frequently Asked Questions

What is CVE-2025-21091? +

How severe is CVE-2025-21091? +

CVE-2025-21091 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2025-21091? +

CVE-2025-21091 affects products from f5, specifically: big-ip_access_policy_manager, big-ip_advanced_firewall_manager, big-ip_advanced_web_application_firewall, big-ip_analytics, big-ip_application_acceleration_manager, big-ip_application_security_manager, big-ip_application_visibility_and_reporting, big-ip_automation_toolchain, big-ip_carrier-grade_nat, big-ip_container_ingress_services, big-ip_ddos_hybrid_defender, big-ip_domain_name_system, big-ip_edge_gateway, big-ip_fraud_protection_service, big-ip_global_traffic_manager, big-ip_link_controller, big-ip_local_traffic_manager, big-ip_policy_enforcement_manager, big-ip_ssl_orchestrator, big-ip_webaccelerator, big-ip_websafe. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21091? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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