diff --git a/changelogs/fragments/11990-ldap-attrs-case-insensitive-attr-lookup.yml b/changelogs/fragments/11990-ldap-attrs-case-insensitive-attr-lookup.yml
new file mode 100644
index 0000000000..679b94c0af
--- /dev/null
+++ b/changelogs/fragments/11990-ldap-attrs-case-insensitive-attr-lookup.yml
@@ -0,0 +1,2 @@
+bugfixes:
+  - ldap_attrs - fix ``state=exact`` incorrectly issuing ``MOD_ADD`` instead of ``MOD_REPLACE`` for attributes returned by the server with different casing (https://github.com/ansible-collections/community.general/issues/1624, https://github.com/ansible-collections/community.general/pull/11990).
diff --git a/plugins/modules/ldap_attrs.py b/plugins/modules/ldap_attrs.py
index 31c4b62090..a4cdf43fc2 100644
--- a/plugins/modules/ldap_attrs.py
+++ b/plugins/modules/ldap_attrs.py
@@ -347,7 +347,8 @@ class LdapAttrs(LdapGeneric):
                 results = self.connection.search_s(self.dn, ldap.SCOPE_BASE, attrlist=[name])
             except ldap.LDAPError as e:
                 self.fail(f"Cannot search for attribute {name}", e)
-            self._cached_values[lc_name] = results[0][1].get(name, [])
+            attrs = results[0][1]
+            self._cached_values[lc_name] = next((v for k, v in attrs.items() if k.lower() == lc_name), [])
         return self._cached_values[lc_name]
 
     def _is_value_absent(self, name, value):