Last Modified: Jul 28, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
21.1.0, 21.1.0.1
Opened: Jul 09, 2026 Severity: 3-Major
The HTTP/2 protocol requires that an empty SETTINGS frame be sent as the first frame. When BIG-IP receives this empty initial SETTINGS frame, it incorrectly terminates the connection with a PROTOCOL_ERROR
Connection is immediately terminated, preventing the client from serving any requests
- BIG-IP has a virtual server with an HTTP/2 profile - Client initiates an HTTP/2 connection and sends its initial SETTINGS frame with no settings
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