diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 7012e8e..f5345e2 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1988,6 +1988,14 @@
 depends_on:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP192R1_ENABLED:MBEDTLS_SHA1_C:MBEDTLS_RSA_C
 x509parse_crt:"3081e430819f020104300d06092a864886f70d0101050500300f310d300b0603550403130454657374301e170d3133303731303135303233375a170d3233303730383135303233375a300f310d300b06035504031304546573743049301306072a8648ce3d020106082a8648ce3d03010103320004e962551a325b21b50cf6b990e33d4318fd16677130726357a196e3efe7107bcb6bdc6d9db2a4df7c964acfe81798433d300d06092a864886f70d01010505000331001a6c18cd1e457474b2d3912743f44b571341a7859a0122774a8e19a671680878936949f904c9255bdd6fffdb33a7e6d8":"cert. version     \: 1\nserial number     \: 04\nissuer name       \: CN=Test\nsubject name      \: CN=Test\nissued  on        \: 2013-07-10 15\:02\:37\nexpires on        \: 2023-07-08 15\:02\:37\nsigned using      \: RSA with SHA1\nEC key size       \: 192 bits\n":0
 
+X509 CRT ASN1 (Unsupported critical extension)
+depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C:!MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
+x509parse_crt:"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":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT ASN1 (Unsupported critical extension with callback)
+depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt_cb:"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":"cert. version     \: 3\nserial number     \: 4D\:3E\:BB\:B8\:A8\:70\:F9\:C7\:8C\:55\:A8\:A7\:E1\:2F\:D5\:16\nissuer name       \: CN=dummy\nsubject name      \: CN=dummy\nissued  on        \: 2020-04-28 17\:42\:43\nexpires on        \: 2020-06-27 17\:42\:43\nsigned using      \: RSA with SHA-256\nRSA key size      \: 2048 bits\nbasic constraints \: CA=true\nsubject alt name  \:\n    dNSName \: dummy\nkey usage         \: Digital Signature, Key Cert Sign\n":0
+
 X509 CRL ASN1 (Incorrect first tag)
 x509parse_crl:"":"":MBEDTLS_ERR_X509_INVALID_FORMAT
 
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index f3e83d6..c52af76 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -301,6 +301,17 @@
 
     return( 0 );
 }
+
+int parse_crt_ext_cb( mbedtls_x509_crt const *crt, mbedtls_x509_buf const *oid, int critical,
+                      const unsigned char *p, const unsigned char *end )
+{
+    ( void ) crt;
+    ( void ) p;
+    ( void ) end;
+    if( MBEDTLS_OID_CMP( MBEDTLS_OID_PKIX "\x01\x1F", oid ) != 0 && critical != 0 )
+        return( MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
+    return( 0 );
+}
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 /* END_HEADER */
 
@@ -771,6 +782,77 @@
         TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
     }
 
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_init( &crt );
+    memset( output, 0, 2000 );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_der_with_ext_cb( &crt, buf->x, buf->len, 0, NULL ) == ( result ) );
+    if( ( result ) == 0 )
+    {
+        res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
+
+        TEST_ASSERT( res != -1 );
+        TEST_ASSERT( res != -2 );
+
+        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
+    }
+
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_init( &crt );
+    memset( output, 0, 2000 );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_der_with_ext_cb( &crt, buf->x, buf->len, 1, NULL ) == ( result ) );
+    if( ( result ) == 0 )
+    {
+        res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
+
+        TEST_ASSERT( res != -1 );
+        TEST_ASSERT( res != -2 );
+
+        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
+    }
+
+exit:
+    mbedtls_x509_crt_free( &crt );
+}
+/* END_CASE */
+
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
+void x509parse_crt_cb( data_t * buf, char * result_str, int result )
+{
+    mbedtls_x509_crt   crt;
+    unsigned char output[2000];
+    int res;
+
+    mbedtls_x509_crt_init( &crt );
+    memset( output, 0, 2000 );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_der_with_ext_cb( &crt, buf->x, buf->len, 0, parse_crt_ext_cb ) == ( result ) );
+    if( ( result ) == 0 )
+    {
+        res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
+
+        TEST_ASSERT( res != -1 );
+        TEST_ASSERT( res != -2 );
+
+        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
+    }
+
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_init( &crt );
+    memset( output, 0, 2000 );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse_der_with_ext_cb( &crt, buf->x, buf->len, 1, parse_crt_ext_cb ) == ( result ) );
+    if( ( result ) == 0 )
+    {
+        res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
+
+        TEST_ASSERT( res != -1 );
+        TEST_ASSERT( res != -2 );
+
+        TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
+    }
+
 exit:
     mbedtls_x509_crt_free( &crt );
 }