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

Forum Discussion

DP's avatar
DP
Icon for Nimbostratus rankNimbostratus
Jun 21, 2018

STARTTLS Proxy

Hi. I'm trying to setup a TLSv1.0 -> TLSv1.2 proxy for STARTTLS SMTP traffic. We need to disable TLSv1.0 and TLSv1.1, on STARTTLS sessions, for compliance reasons on our mail server. Another requ...
irules
LTM
security
Anesh's avatar
Anesh
Icon for Cirrostratus rankCirrostratus
Jun 21, 2018

try

 when CLIENT_ACCEPTED {

 SSL::disable
 TCP::collect 3
}

when CLIENT_DATA {

    if { [TCP::payload length] >= 3 } {
          binary scan [TCP::payload 3] H* hex
          log local0. "Payload in HEX: $hex"

          switch $hex {

            "160301" {
        SSL::profile Legacy_Mail
                SSL::enable
             } 
        default {
                SSL::enable
            }           
    }
    }

        TCP::release

}