diff --git a/src/utils/common.c b/src/utils/common.c
index 450e2c651..27b7c02de 100644
--- a/src/utils/common.c
+++ b/src/utils/common.c
@@ -697,6 +697,18 @@ int is_hex(const u8 *data, size_t len)
 }
 
 
+int has_ctrl_char(const u8 *data, size_t len)
+{
+	size_t i;
+
+	for (i = 0; i < len; i++) {
+		if (data[i] < 32 || data[i] == 127)
+			return 1;
+	}
+	return 0;
+}
+
+
 size_t merge_byte_arrays(u8 *res, size_t res_len,
 			 const u8 *src1, size_t src1_len,
 			 const u8 *src2, size_t src2_len)
diff --git a/src/utils/common.h b/src/utils/common.h
index 701dbb236..a97224070 100644
--- a/src/utils/common.h
+++ b/src/utils/common.h
@@ -488,6 +488,7 @@ const char * wpa_ssid_txt(const u8 *ssid, size_t ssid_len);
 
 char * wpa_config_parse_string(const char *value, size_t *len);
 int is_hex(const u8 *data, size_t len);
+int has_ctrl_char(const u8 *data, size_t len);
 size_t merge_byte_arrays(u8 *res, size_t res_len,
 			 const u8 *src1, size_t src1_len,
 			 const u8 *src2, size_t src2_len);
diff --git a/src/wps/wps_attr_process.c b/src/wps/wps_attr_process.c
index eadb22fe2..e8c457930 100644
--- a/src/wps/wps_attr_process.c
+++ b/src/wps/wps_attr_process.c
@@ -229,6 +229,16 @@ static int wps_workaround_cred_key(struct wps_credential *cred)
 		cred->key_len--;
 #endif /* CONFIG_WPS_STRICT */
 	}
+
+
+	if (cred->auth_type & (WPS_AUTH_WPAPSK | WPS_AUTH_WPA2PSK) &&
+	    (cred->key_len < 8 || has_ctrl_char(cred->key, cred->key_len))) {
+		wpa_printf(MSG_INFO, "WPS: Reject credential with invalid WPA/WPA2-Personal passphrase");
+		wpa_hexdump_ascii_key(MSG_INFO, "WPS: Network Key",
+				      cred->key, cred->key_len);
+		return -1;
+	}
+
 	return 0;
 }