diff --git a/ChangeLog b/ChangeLog
index 8d7a810..ab1b78b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,9 @@
 = mbed TLS 1.3 branch
 
 Security
+   * With authmode set to SSL_VERIFY_OPTIONAL, verification of keyUsage and
+     extendedKeyUsage on the leaf certificate was lost (results not accessible
+     via ssl_get_verify_results()).
 
 Features
    * Add x509_crt_verify_info() to display certificate verification results.
diff --git a/include/polarssl/ssl.h b/include/polarssl/ssl.h
index cd9f770..54382e5 100644
--- a/include/polarssl/ssl.h
+++ b/include/polarssl/ssl.h
@@ -1980,7 +1980,8 @@
  */
 int ssl_check_cert_usage( const x509_crt *cert,
                           const ssl_ciphersuite_t *ciphersuite,
-                          int cert_endpoint );
+                          int cert_endpoint,
+                          int *flags );
 #endif /* POLARSSL_X509_CRT_PARSE_C */
 
 /* constant-time buffer comparison */
diff --git a/library/ssl_srv.c b/library/ssl_srv.c
index dad6872..5f01a01 100644
--- a/library/ssl_srv.c
+++ b/library/ssl_srv.c
@@ -829,6 +829,7 @@
 {
     ssl_key_cert *cur, *list, *fallback = NULL;
     pk_type_t pk_alg = ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
+    int flags;
 
 #if defined(POLARSSL_SSL_SERVER_NAME_INDICATION)
     if( ssl->handshake->sni_key_cert != NULL )
@@ -862,7 +863,7 @@
          * and decrypting with the same RSA key.
          */
         if( ssl_check_cert_usage( cur->cert, ciphersuite_info,
-                                  SSL_IS_SERVER ) != 0 )
+                                  SSL_IS_SERVER, &flags ) != 0 )
         {
             SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
                                 "(extended) key usage extension" ) );
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index d2e0c52..72cd6d2 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -2859,7 +2859,8 @@
 
         if( ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
                                   ciphersuite_info,
-                                  ! ssl->endpoint ) != 0 )
+                                  ! ssl->endpoint,
+                                 &ssl->session_negotiate->verify_result ) != 0 )
         {
             SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
             if( ret == 0 )
@@ -5199,8 +5200,10 @@
 #if defined(POLARSSL_X509_CRT_PARSE_C)
 int ssl_check_cert_usage( const x509_crt *cert,
                           const ssl_ciphersuite_t *ciphersuite,
-                          int cert_endpoint )
+                          int cert_endpoint,
+                          int *flags )
 {
+    int ret = 0;
 #if defined(POLARSSL_X509_CHECK_KEY_USAGE)
     int usage = 0;
 #endif
@@ -5213,6 +5216,7 @@
     !defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
     ((void) cert);
     ((void) cert_endpoint);
+    ((void) flags);
 #endif
 
 #if defined(POLARSSL_X509_CHECK_KEY_USAGE)
@@ -5252,7 +5256,10 @@
     }
 
     if( x509_crt_check_key_usage( cert, usage ) != 0 )
-        return( -1 );
+    {
+        *flags |= BADCERT_KEY_USAGE;
+        ret = -1;
+    }
 #else
     ((void) ciphersuite);
 #endif /* POLARSSL_X509_CHECK_KEY_USAGE */
@@ -5270,10 +5277,13 @@
     }
 
     if( x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
-        return( -1 );
+    {
+        *flags |= BADCERT_EXT_KEY_USAGE;
+        ret = -1;
+    }
 #endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE */
 
-    return( 0 );
+    return( ret );
 }
 #endif /* POLARSSL_X509_CRT_PARSE_C */
 
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 75c5942..5cf4ff6 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1878,6 +1878,17 @@
             -c "Processing of the Certificate handshake message failed" \
             -C "Ciphersuite is TLS-"
 
+run_test    "keyUsage cli: KeyEncipherment, DHE-RSA: fail, soft" \
+            "$O_SRV -key data_files/server2.key \
+             -cert data_files/server2.ku-ke.crt" \
+            "$P_CLI debug_level=1 auth_mode=optional \
+             force_ciphersuite=TLS-DHE-RSA-WITH-AES-128-CBC-SHA" \
+            0 \
+            -c "bad certificate (usage extensions)" \
+            -C "Processing of the Certificate handshake message failed" \
+            -c "Ciphersuite is TLS-" \
+            -c "! Usage does not match the keyUsage extension"
+
 run_test    "keyUsage cli: DigitalSignature, DHE-RSA: OK" \
             "$O_SRV -key data_files/server2.key \
              -cert data_files/server2.ku-ds.crt" \
@@ -1898,6 +1909,17 @@
             -c "Processing of the Certificate handshake message failed" \
             -C "Ciphersuite is TLS-"
 
+run_test    "keyUsage cli: DigitalSignature, RSA: fail, soft" \
+            "$O_SRV -key data_files/server2.key \
+             -cert data_files/server2.ku-ds.crt" \
+            "$P_CLI debug_level=1 auth_mode=optional \
+             force_ciphersuite=TLS-RSA-WITH-AES-128-CBC-SHA" \
+            0 \
+            -c "bad certificate (usage extensions)" \
+            -C "Processing of the Certificate handshake message failed" \
+            -c "Ciphersuite is TLS-" \
+            -c "! Usage does not match the keyUsage extension"
+
 # Tests for keyUsage in leaf certificates, part 3:
 # server-side checking of client cert