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

Forum Discussion

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.

J-H_Johansen's avatar
J-H_Johansen
Icon for Cirrus rankCirrus
May 15, 2026

Haven't heard anything from F5 yet.

I see they added Hotfix-BIGIP-17.5.1.6.0.63.25-ENG but it basically does the same thing as Hotfix-BIGIP-17.5.1.6.0.39.25-ENG which was for iSeries only. Which makes we wonder why they had me install that on a Velos tenant earlier this week.

Juergen_Mang's avatar
Juergen_Mang
Icon for MVP rankMVP
May 16, 2026

My last state from Friday evening is: F5 has replicated the issue and engineering is working on a fix.

What I do not understand is, why that has taken so long. The issue is easily replicateable and the error is very clear.