Last Modified: May 05, 2026
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
17.1.0, 17.1.0.1, 17.1.0.2, 17.1.0.3, 17.1.1, 17.1.1.1, 17.1.1.2, 17.1.1.3, 17.1.1.4, 17.1.2, 17.1.2.1, 17.1.2.2, 17.1.3, 17.1.3.1, 17.1.3.2, 17.5.0, 17.5.1, 17.5.1.2, 17.5.1.3, 17.5.1.4, 17.5.1.5, 17.5.1.6, 21.0.0, 21.0.0.1
Opened: Apr 14, 2026 Severity: 4-Minor
An HTTP/3 virtual server does not transfer a client's request to the backend pool member if the HTTP profile's "Unknown Method" is set to Allow and the HTTP method is unknown.
HTTP/3 virtual server traffic is disrupted.
-- A HTTP/3 profile (and also an HTTP profile) is attached to the virtual server. -- HTTP profile with "Unknown Method : Allow". -- Client request is HTTP/3. The HTTP/3 request method is an unknown HTTP method.
None.
None