diff --git a/scripts/config.py b/scripts/config.py
index cd69ebfdef..34b79e0320 100755
--- a/scripts/config.py
+++ b/scripts/config.py
@@ -196,7 +196,6 @@ EXCLUDE_FROM_FULL = frozenset([
     'MBEDTLS_SSL_PROTO_SSL3',
     'MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO',
     'MBEDTLS_TEST_NULL_ENTROPY', # removes a feature
-    'MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3',
     'MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION', # variant toggle
     'MBEDTLS_ZLIB_SUPPORT', # build dependency (libz)
 ])
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 3099e632d6..6ae13cb0d8 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -176,7 +176,7 @@ x509_cert_info:"data_files/bitstring-in-dn.pem":"cert. version     \: 3\nserial
 
 X509 certificate v1 with extension
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_SHA1_C
-x509_cert_info:"data_files/cert_v1_with_ext.crt":"cert. version     \: 1\nserial number     \: BD\:ED\:44\:C7\:D2\:3E\:C2\:A4\nissuer name       \: C=XX, ST=XX, L=XX, O=XX, OU=XX, emailAddress=admin@identity-check.org, CN=identity-check.org\nsubject name      \: C=XX, ST=XX, L=XX, O=XX, OU=XX, emailAddress=admin@identity-check.org, CN=identity-check.org\nissued  on        \: 2013-07-04 16\:17\:02\nexpires on        \: 2014-07-04 16\:17\:02\nsigned using      \: RSA with SHA1\nRSA key size      \: 2048 bits\nsubject alt name  \:\n    dNSName \: identity-check.org\n    dNSName \: www.identity-check.org\n"
+x509_cert_info:"data_files/cert_v1_with_ext.crt":"cert. version     \: 1\nserial number     \: BD\:ED\:44\:C7\:D2\:3E\:C2\:A4\nissuer name       \: C=XX, ST=XX, L=XX, O=XX, OU=XX, emailAddress=admin@identity-check.org, CN=identity-check.org\nsubject name      \: C=XX, ST=XX, L=XX, O=XX, OU=XX, emailAddress=admin@identity-check.org, CN=identity-check.org\nissued  on        \: 2013-07-04 16\:17\:02\nexpires on        \: 2014-07-04 16\:17\:02\nsigned using      \: RSA with SHA1\nRSA key size      \: 2048 bits\nsubject alt name  \:\n    dNSName \: identity-check.org\n    dNSName \: www.identity-check.org\n    <unsupported>\n"
 
 X509 SAN parsing otherName
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_SHA256_C
@@ -1563,7 +1563,7 @@ depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"308198308182a0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_OUT_OF_DATA
 
 X509 CRT ASN1 (TBS, valid IssuerID, inv SubjectID, inv tag)
-depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+depends_on:!MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"30819a308184a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa1000500300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
 X509 CRT ASN1 (TBSCertificate v3, ext SubjectAlternativeName malformed)
@@ -1583,13 +1583,21 @@ depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"30819a308184a0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_OUT_OF_DATA
 
 X509 CRT ASN1 (TBS, IssuerID unsupported in v1 CRT)
-depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+depends_on:!MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"30819a308184a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
+X509 CRT ASN1 (TBS, IssuerID unsupported in v1 CRT, ALLOW_EXTENSIONS_NON_V3)
+depends_on:MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt:"30819a308184a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
 X509 CRT ASN1 (TBS, SubjectID unsupported in v1 CRT)
-depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+depends_on:!MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"30819a308184a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa200a201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
+X509 CRT ASN1 (TBS, SubjectID unsupported in v1 CRT, ALLOW_EXTENSIONS_NON_V3)
+depends_on:MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt:"30819a308184a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa200a201300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
 X509 CRT ASN1 (TBS, inv v3Ext, inv tag)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"30819c308186a0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a2000500300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
@@ -1830,12 +1838,24 @@ X509 CRT ASN1 (TBS, inv v3Ext, SubjectAltName repeated outside Extensions)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"3081dc3081c6a0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a200a321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
-X509 CRT ASN1 (TBS, valid v3Ext in v1 CRT)
+X509 CRT (TBS, valid v3Ext in v1 CRT, ALLOW_EXTENSIONS_NON_V3)
+depends_on:MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt:"3081b93081a3a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"cert. version     \: 1\nserial number     \: DE\:AD\:BE\:EF\nissuer name       \: ??=Test\nsubject name      \: ??=Test\nissued  on        \: 2009-01-01 00\:00\:00\nexpires on        \: 2009-12-31 23\:59\:59\nsigned using      \: RSA with SHA-256\nRSA key size      \: 128 bits\nsubject alt name  \:\n    dNSName \: foo.test\n    dNSName \: bar.test\n":0
+
+X509 CRT (TBS, valid v3Ext in v2 CRT, ALLOW_EXTENSIONS_NON_V3)
+depends_on:MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt:"3081b93081a3a0030201018204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"cert. version     \: 2\nserial number     \: DE\:AD\:BE\:EF\nissuer name       \: ??=Test\nsubject name      \: ??=Test\nissued  on        \: 2009-01-01 00\:00\:00\nexpires on        \: 2009-12-31 23\:59\:59\nsigned using      \: RSA with SHA-256\nRSA key size      \: 128 bits\nsubject alt name  \:\n    dNSName \: foo.test\n    dNSName \: bar.test\n":0
+
+X509 CRT (TBS, valid v3Ext in v3 CRT)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+x509parse_crt:"3081b93081a3a0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"cert. version     \: 3\nserial number     \: DE\:AD\:BE\:EF\nissuer name       \: ??=Test\nsubject name      \: ??=Test\nissued  on        \: 2009-01-01 00\:00\:00\nexpires on        \: 2009-12-31 23\:59\:59\nsigned using      \: RSA with SHA-256\nRSA key size      \: 128 bits\nsubject alt name  \:\n    dNSName \: foo.test\n    dNSName \: bar.test\n":0
+
+X509 CRT ASN1 (TBS, valid v3Ext in v1 CRT)
+depends_on:!MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"3081b93081a3a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
 X509 CRT ASN1 (TBS, valid v3Ext in v2 CRT)
-depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
+depends_on:!MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
 x509parse_crt:"3081b93081a3a0030201018204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa321301f301d0603551d11041630148208666f6f2e7465737482086261722e74657374300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_INVALID_FORMAT + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
 X509 CRT ASN1 (TBS, valid SubjectID, valid IssuerID, inv v3Ext, SubjectAltName repeated outside Extensions, inv SubjectAltNames tag)