Fix ChangeLog for backport of IOTSSL-621
diff --git a/ChangeLog b/ChangeLog
index d7cf7b9..6e171f1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -8,8 +8,6 @@
    * Fix a potential integer underflow to buffer overread in 
      mbedtls_rsa_rsaes_oaep_decrypt. It is not triggerable remotely in
      SSL/TLS.
-
-Security
    * Fix potential integer overflow to buffer overflow in
      mbedtls_rsa_rsaes_pkcs1_v15_encrypt and mbedtls_rsa_rsaes_oaep_encrypt