diff --git a/docs/development/test-vectors.rst b/docs/development/test-vectors.rst
index b4f23ed..090909b 100644
--- a/docs/development/test-vectors.rst
+++ b/docs/development/test-vectors.rst
@@ -234,6 +234,22 @@
   2048 bit key containing a basic constraints extension marked as
   critical.
 
+Custom X.509 Certificate Revocation List Vectors
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* ``crl_all_reasons.pem`` - Contains a CRL with 12 revoked certificates, whose
+  serials match their list position. It includes one revocation without
+  any entry extensions, 10 revocations with every supported reason code and one 
+  revocation with an unsupported, non-critical entry extension with the OID
+  value set to "1.2.3.4".
+* ``crl_dup_entry_ext.pem`` - Contains a CRL with one revocation which has a
+  duplicate entry extension.
+* ``crl_md2_unknown_crit_entry_ext.pem`` - Contains a CRL with one revocation
+  which contains an unsupported critical entry extension with the OID value set
+  to "1.2.3.4". The CRL uses an unsupported MD2 signature algorithm.
+* ``crl_unsupported_reason.pem`` - Contains a CRL with one revocation which has
+  an unsupported reason code.
+
 Hashes
 ~~~~~~
 
diff --git a/vectors/cryptography_vectors/x509/custom/crl_all_reasons.pem b/vectors/cryptography_vectors/x509/custom/crl_all_reasons.pem
new file mode 100644
index 0000000..960363d
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/crl_all_reasons.pem
@@ -0,0 +1,37 @@
+-----BEGIN X509 CRL-----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+-----END X509 CRL-----
diff --git a/vectors/cryptography_vectors/x509/custom/crl_dup_entry_ext.pem b/vectors/cryptography_vectors/x509/custom/crl_dup_entry_ext.pem
new file mode 100644
index 0000000..1b1d313
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/crl_dup_entry_ext.pem
@@ -0,0 +1,11 @@
+-----BEGIN X509 CRL-----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+-----END X509 CRL-----
diff --git a/vectors/cryptography_vectors/x509/custom/crl_md2_unknown_crit_entry_ext.pem b/vectors/cryptography_vectors/x509/custom/crl_md2_unknown_crit_entry_ext.pem
new file mode 100644
index 0000000..c6b378c
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/crl_md2_unknown_crit_entry_ext.pem
@@ -0,0 +1,11 @@
+-----BEGIN X509 CRL-----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+-----END X509 CRL-----
diff --git a/vectors/cryptography_vectors/x509/custom/crl_unsupported_reason.pem b/vectors/cryptography_vectors/x509/custom/crl_unsupported_reason.pem
new file mode 100644
index 0000000..3d12675
--- /dev/null
+++ b/vectors/cryptography_vectors/x509/custom/crl_unsupported_reason.pem
@@ -0,0 +1,11 @@
+-----BEGIN X509 CRL-----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+-----END X509 CRL-----