CVE-2021-22999

HIGH

F5 BIG-IP 14.1.0-14.1.3 - Denial of Service via HTTP/2 to HTTP/1.x Connection Handling

Title source: llm
STIX 2.1

Description

On versions 15.0.x before 15.1.0 and 14.1.x before 14.1.4, the BIG-IP system provides an option to connect HTTP/2 clients to HTTP/1.x servers. When a client is slow to accept responses and it closes a connection prematurely, the BIG-IP system may indefinitely retain some streams unclosed. Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

References (1)

Core 1
Core References
Vendor Advisory x_refsource_misc
https://support.f5.com/csp/article/K02333782

Scores

CVSS v3 7.5
EPSS 0.0065
EPSS Percentile 71.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (14)
f5/big-ip_access_policy_manager 14.1.0 - 14.1.4
f5/big-ip_advanced_firewall_manager 14.1.0 - 14.1.4
f5/big-ip_advanced_web_application_firewall 14.1.0 - 14.1.4
f5/big-ip_analytics 14.1.0 - 14.1.4
f5/big-ip_application_acceleration_manager 14.1.0 - 14.1.4
f5/big-ip_application_security_manager 14.1.0 - 14.1.4
f5/big-ip_ddos_hybrid_defender 14.1.0 - 14.1.4
f5/big-ip_domain_name_system 14.1.0 - 14.1.4
f5/big-ip_fraud_protection_service 14.1.0 - 14.1.4
f5/big-ip_global_traffic_manager 14.1.0 - 14.1.4
... and 4 more
Published Mar 31, 2021
Tracked Since Feb 18, 2026