diff --git a/pkgs/development/python2-modules/pip/default.nix b/pkgs/development/python2-modules/pip/default.nix
index e0b6b001cb3e..31383a035c0f 100644
--- a/pkgs/development/python2-modules/pip/default.nix
+++ b/pkgs/development/python2-modules/pip/default.nix
@@ -40,6 +40,9 @@ buildPythonPackage rec {
     description = "PyPA recommended tool for installing Python packages";
     license = with lib.licenses; [ mit ];
     homepage = "https://pip.pypa.io/";
+    knownVulnerabilities = [
+      "CVE-2021-28363"
+    ];
     priority = 10;
   };
 }