diff --git a/pkgs/tools/networking/asleap/default.nix b/pkgs/tools/networking/asleap/default.nix
new file mode 100644
index 00000000000..1d40bb3b22d
--- /dev/null
+++ b/pkgs/tools/networking/asleap/default.nix
@@ -0,0 +1,27 @@
+{lib, stdenv, fetchFromGitHub, openssl, libpcap, libxcrypt}:
+
+stdenv.mkDerivation rec {
+  pname = "asleap";
+  version = "unstable-2021-06-20";
+
+  src = fetchFromGitHub {
+    owner = "zackw";
+    repo = pname;
+    rev = "eb3bd42098cba42b65f499c9d8c73d890861b94f";
+    sha256 = "sha256-S6jS0cg9tHSfmP6VHyISkXJxczhPx3HDdxT46c+YmE8=";
+  };
+
+  buildInputs = [ openssl libpcap libxcrypt ];
+
+  installPhase = ''
+    install -Dm755 asleap $out/bin/asleap
+    install -Dm755 genkeys $out/bin/genkeys
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/zackw/asleap";
+    description = "Recovers weak LEAP and PPTP passwords";
+    license = licenses.gpl2Only;
+    maintainers = with maintainers; [ thehedgeh0g ];
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a3f93bdfe18..2698bad1730 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1117,6 +1117,8 @@ with pkgs;
 
   amidst = callPackage ../tools/games/minecraft/amidst { };
 
+  asleap = callPackage ../tools/networking/asleap { };
+
   cf-vault = callPackage ../tools/admin/cf-vault { };
 
   bikeshed = python3Packages.callPackage ../applications/misc/bikeshed { };