diff --git a/AUTHORS.TXT b/AUTHORS.TXT
index 32db401f..0d608103 100644
--- a/AUTHORS.TXT
+++ b/AUTHORS.TXT
@@ -145,6 +145,10 @@ CONTRIBUTORS on GitHub:
   - macvk
     https://github.com/macvk
 
+  - Guido Vranken
+    https://github.com/guidovranken
+
+
 JOIN THE SOFTETHER VPN DEVELOPMENT
 ----------------------------------
 
diff --git a/src/Cedar/IPsec_L2TP.c b/src/Cedar/IPsec_L2TP.c
index 3a930f37..4c9f1e7b 100644
--- a/src/Cedar/IPsec_L2TP.c
+++ b/src/Cedar/IPsec_L2TP.c
@@ -792,6 +792,12 @@ L2TP_PACKET *ParseL2TPPacket(UDPPACKET *p)
 			size -= 2;
 
 			a.DataSize = a.Length - 6;
+
+			if (a.DataSize > size)
+			{
+				goto LABEL_ERROR;
+			}
+
 			a.Data = Clone(buf, a.DataSize);
 
 			buf += a.DataSize;
diff --git a/src/Cedar/IPsec_PPP.c b/src/Cedar/IPsec_PPP.c
index 5482c53e..d2b7cb18 100644
--- a/src/Cedar/IPsec_PPP.c
+++ b/src/Cedar/IPsec_PPP.c
@@ -291,7 +291,7 @@ void PPPThread(THREAD *thread, void *param)
 						ReadBuf(b, client_response_buffer, 49);
 
 						Zero(username_tmp, sizeof(username_tmp));
-						ReadBuf(b, username_tmp, sizeof(username_tmp));
+						ReadBuf(b, username_tmp, sizeof(username_tmp) - 1);
 
 						Debug("First MS-CHAPv2: id=%s\n", username_tmp);
 
@@ -977,7 +977,7 @@ PPP_PACKET *PPPProcessRequestPacket(PPP_SESSION *p, PPP_PACKET *req)
 					ReadBuf(b, client_response_buffer, 49);
 
 					Zero(username_tmp, sizeof(username_tmp));
-					ReadBuf(b, username_tmp, sizeof(username_tmp));
+					ReadBuf(b, username_tmp, sizeof(username_tmp) - 1);
 
 					client_challenge_16 = client_response_buffer + 0;
 					client_response_24 = client_response_buffer + 16 + 8;
diff --git a/src/Cedar/Interop_OpenVPN.c b/src/Cedar/Interop_OpenVPN.c
index 91715729..aecac52e 100644
--- a/src/Cedar/Interop_OpenVPN.c
+++ b/src/Cedar/Interop_OpenVPN.c
@@ -2845,7 +2845,7 @@ bool OvsPerformTcpServer(CEDAR *cedar, SOCK *sock)
 			{
 				void *ptr = FifoPtr(tcp_recv_fifo);
 				USHORT packet_size = READ_USHORT(ptr);
-				if (packet_size <= OPENVPN_TCP_MAX_PACKET_SIZE)
+				if (packet_size != 0 && packet_size <= OPENVPN_TCP_MAX_PACKET_SIZE)
 				{
 					UINT total_len = (UINT)packet_size + sizeof(USHORT);
 					if (r >= total_len)
diff --git a/src/Cedar/Radius.c b/src/Cedar/Radius.c
index c4a41df7..34c0838c 100644
--- a/src/Cedar/Radius.c
+++ b/src/Cedar/Radius.c
@@ -1827,6 +1827,13 @@ bool RadiusLogin(CONNECTION *c, char *server, UINT port, UCHAR *secret, UINT sec
 		if (encrypted_password == NULL)
 		{
 			// Encryption failure
+
+			// Release the ip_list
+			for(i = 0; i < LIST_NUM(ip_list); i++)
+			{
+				IP *tmp_ip = LIST_DATA(ip_list, i);
+				Free(tmp_ip);
+			}
 			ReleaseList(ip_list);
 			return false;
 		}
diff --git a/src/Cedar/Virtual.c b/src/Cedar/Virtual.c
index f7f326d4..f3ea20c3 100644
--- a/src/Cedar/Virtual.c
+++ b/src/Cedar/Virtual.c
@@ -2250,6 +2250,7 @@ BUF *NnReadDnsRecord(BUF *buf, bool answer, USHORT *ret_type, USHORT *ret_class)
 		data = Malloc(data_len);
 		if (ReadBuf(buf, data, data_len) != data_len)
 		{
+			Free(data);
 			return false;
 		}
 
diff --git a/src/Mayaqua/Memory.c b/src/Mayaqua/Memory.c
index 31268061..92b7efa5 100644
--- a/src/Mayaqua/Memory.c
+++ b/src/Mayaqua/Memory.c
@@ -4313,6 +4313,21 @@ void Copy(void *dst, void *src, UINT size)
 	memcpy(dst, src, size);
 }
 
+// Memory move
+void Move(void *dst, void *src, UINT size)
+{
+	// Validate arguments
+	if (dst == NULL || src == NULL || size == 0 || dst == src)
+	{
+		return;
+	}
+
+	// KS
+	KS_INC(KS_COPY_COUNT);
+
+	memmove(dst, src, size);
+}
+
 // Memory comparison
 int Cmp(void *p1, void *p2, UINT size)
 {
diff --git a/src/Mayaqua/Memory.h b/src/Mayaqua/Memory.h
index 693386ba..28babd8b 100644
--- a/src/Mayaqua/Memory.h
+++ b/src/Mayaqua/Memory.h
@@ -284,6 +284,7 @@ void *InternalReAlloc(void *addr, UINT size);
 void InternalFree(void *addr);
 
 void Copy(void *dst, void *src, UINT size);
+void Move(void *dst, void *src, UINT size);
 int Cmp(void *p1, void *p2, UINT size);
 int CmpCaseIgnore(void *p1, void *p2, UINT size);
 void ZeroMem(void *addr, UINT size);
diff --git a/src/Mayaqua/Network.c b/src/Mayaqua/Network.c
index df057213..a1d5c83c 100644
--- a/src/Mayaqua/Network.c
+++ b/src/Mayaqua/Network.c
@@ -7373,7 +7373,7 @@ bool StrToIP6(IP *ip, char *str)
 	if (StartWith(tmp, "[") && EndWith(tmp, "]"))
 	{
 		// If the string is enclosed in square brackets, remove brackets
-		StrCpy(tmp, sizeof(tmp), &tmp[1]);
+		StrCpyAllowOverlap(tmp, sizeof(tmp), &tmp[1]);
 
 		if (StrLen(tmp) >= 1)
 		{
@@ -12691,6 +12691,14 @@ bool RecvAll(SOCK *sock, void *data, UINT size, bool secure)
 		{
 			return false;
 		}
+		if (ret == SOCK_LATER)
+		{
+			// I suppose that this is safe because the RecvAll() function is used only 
+			// if the sock->AsyncMode == true. And the Recv() function may return
+			// SOCK_LATER only if the sock->AsyncMode == false. Therefore the call of 
+			// Recv() function in the RecvAll() function never returns SOCK_LATER.
+			return false;
+		}
 		recv_size += ret;
 		if (recv_size >= size)
 		{
@@ -17597,7 +17605,7 @@ void IPToInAddr6(struct in6_addr *addr, IP *ip)
 		return;
 	}
 
-	Zero(addr, sizeof(struct in_addr));
+	Zero(addr, sizeof(struct in6_addr));
 
 	if (IsIP6(ip))
 	{
diff --git a/src/Mayaqua/Pack.c b/src/Mayaqua/Pack.c
index 64ae8ce8..7cc67058 100644
--- a/src/Mayaqua/Pack.c
+++ b/src/Mayaqua/Pack.c
@@ -354,7 +354,7 @@ VALUE *ReadValue(BUF *b, UINT type)
 		break;
 	case VALUE_STR:			// ANSI string
 		len = ReadBufInt(b);
-		if ((len + 1) > MAX_VALUE_SIZE)
+		if (len > (MAX_VALUE_SIZE - 1))
 		{
 			// Size over
 			break;
diff --git a/src/Mayaqua/Str.c b/src/Mayaqua/Str.c
index 66e7acc3..482f9822 100644
--- a/src/Mayaqua/Str.c
+++ b/src/Mayaqua/Str.c
@@ -3346,6 +3346,54 @@ UINT StrCpy(char *dst, UINT size, char *src)
 
 	return len;
 }
+UINT StrCpyAllowOverlap(char *dst, UINT size, char *src)
+{
+	UINT len;
+	// Validate arguments
+	if (dst == src)
+	{
+		return StrLen(src);
+	}
+	if (dst == NULL || src == NULL)
+	{
+		if (src == NULL && dst != NULL)
+		{
+			if (size >= 1)
+			{
+				dst[0] = '\0';
+			}
+		}
+		return 0;
+	}
+	if (size == 1)
+	{
+		dst[0] = '\0';
+		return 0;
+	}
+	if (size == 0)
+	{
+		// Ignore the length
+		size = 0x7fffffff;
+	}
+
+	// Check the length
+	len = StrLen(src);
+	if (len <= (size - 1))
+	{
+		Move(dst, src, len + 1);
+	}
+	else
+	{
+		len = size - 1;
+		Move(dst, src, len);
+		dst[len] = '\0';
+	}
+
+	// KS
+	KS_INC(KS_STRCPY_COUNT);
+
+	return len;
+}
 
 // Check whether the string buffer is within the specified size
 bool StrCheckSize(char *str, UINT size)
diff --git a/src/Mayaqua/Str.h b/src/Mayaqua/Str.h
index f5ad7769..92da8dc8 100644
--- a/src/Mayaqua/Str.h
+++ b/src/Mayaqua/Str.h
@@ -135,6 +135,7 @@ UINT StrSize(char *str);
 bool StrCheckLen(char *str, UINT len);
 bool StrCheckSize(char *str, UINT size);
 UINT StrCpy(char *dst, UINT size, char *src);
+UINT StrCpyAllowOverlap(char *dst, UINT size, char *src);
 UINT StrCat(char *dst, UINT size, char *src);
 UINT StrCatLeft(char *dst, UINT size, char *src);
 char ToLower(char c);
diff --git a/src/Mayaqua/TcpIp.c b/src/Mayaqua/TcpIp.c
index c838f9f6..00b16cc8 100644
--- a/src/Mayaqua/TcpIp.c
+++ b/src/Mayaqua/TcpIp.c
@@ -174,14 +174,14 @@ ICMP_RESULT *IcmpParseResult(IP *dest_ip, USHORT src_id, USHORT src_seqno, UCHAR
 	if (true)
 	{
 		UINT ip_header_size = GetIpHeaderSize(recv_buffer, i);
-		if (ip_header_size >= sizeof(IPV4_HEADER))
+		if (ip_header_size >= sizeof(IPV4_HEADER) && (ip_header_size <= i))
 		{
 			IPV4_HEADER *ipv4 = (IPV4_HEADER *)recv_buffer;
 			if ((IPV4_GET_VERSION(ipv4) == 4) && (ipv4->Protocol == IP_PROTO_ICMPV4))
 			{
 				UINT ip_total_len = (UINT)Endian16(ipv4->TotalLength);
 
-				if ((ip_total_len >= sizeof(IPV4_HEADER)) && (ip_total_len <= i))
+				if ((ip_total_len >= sizeof(IPV4_HEADER)) && (ip_total_len <= i) && (ip_total_len >= ip_header_size))
 				{
 					UINT icmp_packet_size = ip_total_len - ip_header_size;
 					ICMP_HEADER *icmp = (ICMP_HEADER *)(recv_buffer + ip_header_size);
@@ -1957,7 +1957,7 @@ void CorrectChecksum(PKT *p)
 						{
 							udp->Checksum = 0;
 
-							if ((IPV4_GET_FLAGS(v4) & 0x01) == 0)
+							if ((IPV4_GET_FLAGS(v4) & 0x01) == 0 && (p->IPv4PayloadSize >= udp_len))
 							{
 								// Calculate the checksum correctly based on the data in case of a non-fragmented packet
 								udp->Checksum = CalcChecksumForIPv4(v4->SrcIP, v4->DstIP, IP_PROTO_UDP, udp, udp_len, 0);
@@ -2023,7 +2023,7 @@ void CorrectChecksum(PKT *p)
 						{
 							udp->Checksum = 0;
 
-							if (v6info->FragmentHeader == NULL || ((IPV6_GET_FLAGS(v6info->FragmentHeader) & IPV6_FRAGMENT_HEADER_FLAG_MORE_FRAGMENTS) == 0))
+							if ((v6info->FragmentHeader == NULL || ((IPV6_GET_FLAGS(v6info->FragmentHeader) & IPV6_FRAGMENT_HEADER_FLAG_MORE_FRAGMENTS) == 0)) && (v6info->PayloadSize >= udp_len))
 							{
 								// If the packet is not fragmented, recalculate the checksum
 								udp->Checksum = CalcChecksumForIPv6(&v6->SrcAddress, &v6->DestAddress, IP_PROTO_UDP, udp, udp_len, 0);
@@ -2868,6 +2868,7 @@ PKT *ParsePacketIPv4WithDummyMacHeader(UCHAR *buf, UINT size)
 {
 	UCHAR *tmp;
 	UINT tmp_size;
+	PKT *ret;
 	// Validate arguments
 	if (buf == NULL)
 	{
@@ -2880,7 +2881,14 @@ PKT *ParsePacketIPv4WithDummyMacHeader(UCHAR *buf, UINT size)
 	WRITE_USHORT(tmp + 12, MAC_PROTO_IPV4);
 	Copy(tmp + 14, buf, size);
 
-	return ParsePacket(tmp, tmp_size);
+	ret = ParsePacket(tmp, tmp_size);
+
+	if (ret == NULL)
+	{
+		Free(tmp);
+	}
+
+	return ret;
 }
 
 // IPv4 parsing
diff --git a/src/bin/hamcore/authors.txt b/src/bin/hamcore/authors.txt
index 44fdbcfd..b89c36a1 100644
--- a/src/bin/hamcore/authors.txt
+++ b/src/bin/hamcore/authors.txt
@@ -139,6 +139,16 @@ CONTRIBUTORS on GitHub:
   - Guanzhong Chen
     https://github.com/quantum5
 
+  - Nguyen Hong Quan
+    https://github.com/hongquan
+
+  - macvk
+    https://github.com/macvk
+
+  - Guido Vranken
+    https://github.com/guidovranken
+
+
 JOIN THE SOFTETHER VPN DEVELOPMENT
 ----------------------------------