diff --git a/pkgs/servers/mail/opensmtpd/default.nix b/pkgs/servers/mail/opensmtpd/default.nix
index 22744b36d432c..93d3055eb26e0 100644
--- a/pkgs/servers/mail/opensmtpd/default.nix
+++ b/pkgs/servers/mail/opensmtpd/default.nix
@@ -65,6 +65,7 @@ stdenv.mkDerivation rec {
     license = licenses.isc;
     platforms = platforms.linux;
     maintainers = with maintainers; [ rickynils obadz ekleog ];
+    knownVulnerabilities = [ "CVE-2020-8794" ];
   };
   passthru.tests = {
     basic-functionality-and-dovecot-interaction = nixosTests.opensmtpd;