diff --git a/ChangeLog.d/resumption_cid.txt b/ChangeLog.d/resumption_cid.txt
new file mode 100644
index 0000000..5c237aa
--- /dev/null
+++ b/ChangeLog.d/resumption_cid.txt
@@ -0,0 +1,5 @@
+Bugfix
+   * Fix server connection identifier setting for outgoing encrypted records
+     on DTLS 1.2 session resumption. After DTLS 1.2 session resumption with
+     connection identifier, the Mbed TLS client now properly sends the server
+     connection identifier in encrypted record headers. Fix #5872.
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 35f11ea..050aaa1 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -1409,16 +1409,6 @@
     else
     {
         ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
-
-        if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
-        {
-            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
-            mbedtls_ssl_send_alert_message(
-                ssl,
-                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
-                MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
-            return( ret );
-        }
     }
 
     MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
@@ -1655,6 +1645,24 @@
     }
 
     /*
+     * mbedtls_ssl_derive_keys() has to be called after the parsing of the
+     * extensions. It sets the transform data for the resumed session which in
+     * case of DTLS includes the server CID extracted from the CID extension.
+     */
+    if( ssl->handshake->resume )
+    {
+        if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
+        {
+            MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
+            mbedtls_ssl_send_alert_message(
+                ssl,
+                MBEDTLS_SSL_ALERT_LEVEL_FATAL,
+                MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
+            return( ret );
+        }
+    }
+
+    /*
      * Renegotiation security checks
      */
     if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index edd5161..6df879c 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -3836,6 +3836,29 @@
             -C "parse new session ticket" \
             -c "a session has been resumed"
 
+# Tests for Session resume and extensions
+
+requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2
+requires_config_enabled MBEDTLS_SSL_DTLS_CONNECTION_ID
+run_test    "Session resume and connection ID" \
+            "$P_SRV debug_level=3 cid=1 cid_val=dead dtls=1 tickets=0" \
+            "$P_CLI debug_level=3 cid=1 cid_val=beef dtls=1 tickets=0 reconnect=1" \
+            0 \
+            -c "Enable use of CID extension." \
+            -s "Enable use of CID extension." \
+            -c "client hello, adding CID extension" \
+            -s "found CID extension"           \
+            -s "Use of CID extension negotiated" \
+            -s "server hello, adding CID extension" \
+            -c "found CID extension" \
+            -c "Use of CID extension negotiated" \
+            -s "Copy CIDs into SSL transform" \
+            -c "Copy CIDs into SSL transform" \
+            -c "Peer CID (length 2 Bytes): de ad" \
+            -s "Peer CID (length 2 Bytes): be ef" \
+            -s "Use of Connection ID has been negotiated" \
+            -c "Use of Connection ID has been negotiated"
+
 # Tests for Session Resume based on session-ID and cache, DTLS
 
 requires_config_enabled MBEDTLS_SSL_PROTO_TLS1_2