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

Forum Discussion

David_M's avatar
David_M
Icon for Cirrostratus rankCirrostratus
3 years ago

Bigip mgmt port using tls 1.0 for smtp connection

Hi, We running 15.1.5.1 We did the smtp config from GUI and used the test button - we usue mgmt port for this config - it keeps using tls 1.0 but our mimecast server supports tls 1.2, how can i mak...
application delivery
smtp
tls
Patrik_Jonsson's avatar
Patrik_Jonsson
Icon for MVP rankMVP
3 years ago

Hi!
Have you checked the client cipherlist with tcpdump? The client suggests ciphers and the server chooses according to it's cipher priority config. Sadly it would seem like sSMTP 2.64 is used and a quick Google says it only supports TLS 1.0.

Kind regards,
Patrik