Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

Forum Discussion

Sam_D_'s avatar
Sam_D_
Icon for Altostratus rankAltostratus
Apr 23, 2021

Problems with BigIP/APM as Identity Provider for SAML2

Problem One:   I've configured my BiIP/APM as Identity Provider for SAML SSO (SP-Inited SSO) integration with our partner(Service Provider). When the counterpart Service Provider POST (by default, ...
BIG-IP Access Policy Manager (APM)
LTM
security
Sam_D_'s avatar
Sam_D_
Icon for Altostratus rankAltostratus
Apr 25, 2021

  thanks for your detailed info! the bug https://support.f5.com/csp/article/K13423312 mentioned by you concerns the max length of post data, however, what I observed is related to the length of the REDIRECT AuthnRequest URL in the SP-Inited SSO scenario

  • Nikoolayy1's avatar
    Nikoolayy1
    Icon for MVP rankMVP
    Apr 26, 2021

    Still check the APM and tmm logs if they have smothing as there are other bugs related to how big the SAML resource or metadata is :

     

    https://cdn.f5.com/product/bugtracker/ID702263.html

     

     

    And see what I mentioned about the first issue that the F5 can set artifact method as GET even when the assertion is POST.