Going through SiteMinder documentation, we realize that SiteMinder implements GSS-API for Kerberos authentication in the following section:
https://techdocs.broadcom.com/us/en/symantec-security-software/identity-security/siteminder/12-8/configuring/policy-server-configuration/authentication-schemes/configure-kerberos-authentication/policy-server-configuration-for-kerberos-authentication.html
what is the version of GSS-API implemented in the mentioned SiteMinder version?
Release : 12.8
Component : SITEMINDER -WEB AGENT FOR APACHE
12.8 SP4 is delivered with MIT Kerberos 1.15.2 which supports GSSAPIv2.
Refer to https://web.mit.edu/kerberos/krb5-1.15/doc/appdev/gssapi.html