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

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Juergen_Mang's avatar
Juergen_Mang
Icon for MVP rankMVP
May 04, 2026
Solved

Errors with AS3 3.56.0 with F5 17.5.1.6

Hi Folks,   I upgraded my Lab F5s to 17.5.1.6 and now my AS3 declarations are not working anymore. I get following error regardless of the declaration, even an empty declaration throws this err...
devops
  • Juergen_Mang's avatar
    Juergen_Mang
    May 18, 2026

    I got a fixed AS3 Version 3.57.0-12 that fixes this issue in my tests.

Juergen_Mang's avatar
Juergen_Mang
Icon for MVP rankMVP
May 04, 2026

If anyone else wants to report this error to F5, my case number is 01145714.

  • Frederic_Zelle1's avatar
    Frederic_Zelle1
    Icon for Nimbostratus rankNimbostratus
    May 05, 2026

    You're not alone. my ticket number is 01146429, root cause is 17.5.1.6 hardening that now prevents the usage of http://localhost:8100/mgmt/tm/util ( we can still use https://localhost/mgmt/tm/util )

     

    But apparently the hardening team didn't test with AS3 team that still uses the internal http on port 8100 on their version 3.56

     

    Hoping they release a new AS3 version soon