TLS_Ciphers specifies which subset of cipher suites is permissible for a connection when TLSv1.2 or earlier is negotiated. The parameter format is the cipher list format documented in OpenSSL manual for openssl ciphers command. The default value is DEFAULT:!EXPORT:!LOW.

# Exclude cipher suites using RC4 too
TLS_Ciphers DEFAULT:!EXPORT:!LOW:!RC4

This parameter affects only TLSv1.2 and earlier TLS versions. For the respective parameter for TLSv1.3, see Section 3.11.10. TLS_Ciphersuites

When SSL library supports security levels, a level can be set for each configuration clause together with cipher string. For more information about security levels, see Section 3.11.11. TLS_SecurityLevel

# System default level 2 is too strict for this module
TLS_Ciphers DEFAULT:!EXPORT:!LOW@SECLEVEL=1