diff --git a/client/src/cmdlfnedap.c b/client/src/cmdlfnedap.c
index a844711d9..4d51116e8 100644
--- a/client/src/cmdlfnedap.c
+++ b/client/src/cmdlfnedap.c
@@ -530,7 +530,7 @@ static int CmdLFNedapSim(const char *Cmd) {
     uint8_t data[16];
     NedapGen(sub_type, customer_code, id, is_long, data);
 
-    uint8_t bs[16 * 8];
+    uint8_t bs[16 * 8] = {0};
     for (uint8_t i = 0; i < max; i++) {
         num_to_bytebits(data[i], 8, bs + i * 8);
     }
diff --git a/tools/mfd_aes_brute/mfd_multi_brute.c b/tools/mfd_aes_brute/mfd_multi_brute.c
index b097c77d7..4781d384a 100644
--- a/tools/mfd_aes_brute/mfd_multi_brute.c
+++ b/tools/mfd_aes_brute/mfd_multi_brute.c
@@ -222,6 +222,8 @@ static void *brute_thread(void *arguments) {
         //make_key_borland_n(i, key, keylen);
 
         uint8_t iv[keylen << 1];
+        memset(iv, 0, sizeof(iv));
+
         uint8_t dec_tag[16] = {0x00};
         uint8_t dec_rdr[32] = {0x00};