OpenLDAP - correct invalid cn entries

A bug in a PHP script has caused some entries in the LDAP database to have invalid entries:

# James + Bond, people, mi6.gov.uk
dn: cn=James+sn=Bond,ou=people,dc=mi6,dc=gov,dc=uk
sn: Bond
givenName: James
cn:: U3RldmUg
gecos:: U3RldmUg

As you can see, the cn: and gecos: have the invalid entries - they should be James Bond.

I did attempt to correct the problem with ldapmodify by putting the following into a file called updateCN.ldif:

dn: cn=James+sn=Bond,ou=people,dc=mi6,dc=gov,dc=uk
changetype:modify
replace: cn
cn: James Bond

and executing the following command:

ldapmodify -x -W -D "cn=admin,dc=mi6,dc=gov,dc=uk" -f updateCN.ldif

This returned the following error

Enter LDAP Password:
modifying entry "cn=James+sn=Bond,ou=people,dc=mi6,dc=gov,dc=uk"
ldap_modify: Naming violation (64)
additional info: value of naming attribute 'cn' is not present in entry

How can I correct the invalid entries in the LDAP database?

Hello:
I can't check but cn and dn are special attributes.
You can get information in command ldapmodrdn

man ldapmodrdn

There you can find an example:

EXAMPLE Assuming that the file /tmp/entrymods exists and has the contents: cn=Modify Me,dc=example,dc=com cn=The New Me the command: ldapmodrdn -r -f /tmp/entrymods will change the RDN of the "Modify Me" entry from "Modify Me" to "The New Me" and the old cn, "Modify Me" will be removed.