diff --git a/rehlds/engine/host_cmd.cpp b/rehlds/engine/host_cmd.cpp
index c72d1b5..a666016 100644
--- a/rehlds/engine/host_cmd.cpp
+++ b/rehlds/engine/host_cmd.cpp
@@ -2426,7 +2426,6 @@ void Host_Changelevel2_f(void)
 void Host_Version_f(void)
 {
 	Con_Printf("Protocol version %i\nExe version %s (%s)\n", PROTOCOL_VERSION, gpszVersionString, gpszProductString);
-	Con_Printf("ReHLDS API version %i.%i\n", REHLDS_API_VERSION_MAJOR, REHLDS_API_VERSION_MINOR);
 #ifdef REHLDS_FIXES
 	Con_Printf("Exe build: " __TIME__ " " __DATE__ " (%i)\n", build_number());
 #else // REHLDS_FIXES
@@ -2436,6 +2435,7 @@ void Host_Version_f(void)
 	Con_Printf("Exe build: 10:03:21 Aug  8 2013 (%i)\n", build_number());
 	#endif // _WIN32
 #endif // REHLDS_FIXES
+	Con_Printf("ReHLDS API version %i.%i\n", REHLDS_API_VERSION_MAJOR, REHLDS_API_VERSION_MINOR);
 }
 
 /* <3d516> ../engine/host_cmd.c:3382 */
diff --git a/rehlds/engine/net_ws.cpp b/rehlds/engine/net_ws.cpp
index c1f124e..f72cd2a 100644
--- a/rehlds/engine/net_ws.cpp
+++ b/rehlds/engine/net_ws.cpp
@@ -314,7 +314,7 @@ qboolean NET_IsReservedAdr(netadr_t& a)
 }
 
 /* <d3352> ../engine/net_ws.c:332 */
-qboolean NET_CompareBaseAdr(netadr_t& a, netadr_t& b)
+qboolean NET_CompareBaseAdr(const netadr_t& a, const netadr_t& b)
 {
 	if (a.type != b.type)
 	{
diff --git a/rehlds/engine/net_ws.h b/rehlds/engine/net_ws.h
index ded79d0..2af6da9 100644
--- a/rehlds/engine/net_ws.h
+++ b/rehlds/engine/net_ws.h
@@ -234,7 +234,7 @@ NOXREF short unsigned int NET_HostToNetShort(short unsigned int us_in);
 qboolean NET_CompareAdr(netadr_t& a, netadr_t& b);
 qboolean NET_CompareClassBAdr(netadr_t& a, netadr_t& b);
 qboolean NET_IsReservedAdr(netadr_t& a);
-qboolean NET_CompareBaseAdr(netadr_t& a, netadr_t& b);
+qboolean NET_CompareBaseAdr(const netadr_t& a, const netadr_t& b);
 char *NET_AdrToString(const netadr_t& a);
 char *NET_BaseAdrToString(netadr_t& a);
 qboolean NET_StringToSockaddr(const char *s, struct sockaddr *sadr);
diff --git a/rehlds/engine/server.h b/rehlds/engine/server.h
index 559ef22..71820b4 100644
--- a/rehlds/engine/server.h
+++ b/rehlds/engine/server.h
@@ -652,7 +652,7 @@ int SV_FindEmptySlot(netadr_t *adr, int *pslot, client_t ** ppClient);
 void SV_ConnectClient(void);
 void SV_ConnectClient_internal(void);
 void SVC_Ping(void);
-int SV_GetChallenge(netadr_t& adr);
+int SV_GetChallenge(const netadr_t& adr);
 void SVC_GetChallenge(void);
 void SVC_ServiceChallenge(void);
 void SV_ResetModInfo(void);
diff --git a/rehlds/engine/sv_main.cpp b/rehlds/engine/sv_main.cpp
index ef4feff..0bdefc7 100644
--- a/rehlds/engine/sv_main.cpp
+++ b/rehlds/engine/sv_main.cpp
@@ -194,7 +194,11 @@ cvar_t max_queries_window = { "max_queries_window", "60", FCVAR_SERVER | FCVAR_P
 cvar_t sv_logblocks = { "sv_logblocks", "0", FCVAR_SERVER, 0.0f, NULL };
 cvar_t sv_downloadurl = { "sv_downloadurl", "", FCVAR_PROTECTED, 0.0f, NULL };
 cvar_t sv_allow_dlfile = { "sv_allow_dlfile", "1", 0, 0.0f, NULL };
-cvar_t sv_version = { "sv_version", "", 0, 0.0f, NULL };
+#ifdef REHLDS_FIXES
+cvar_t sv_version = { "sv_version", "", FCVAR_SERVER, 0.0f, NULL };
+#else
+cvar_t sv_version = {"sv_version", "", 0, 0.0f, NULL};
+#endif
 
 cvar_t sv_rcon_minfailures = { "sv_rcon_minfailures", "5", 0, 0.0f, NULL };
 cvar_t sv_rcon_maxfailures = { "sv_rcon_maxfailures", "10", 0, 0.0f, NULL };
@@ -2418,7 +2422,7 @@ void SVC_Ping(void)
 	NET_SendPacket(NS_SERVER, sizeof(data), data, net_from);
 }
 
-int SV_GetChallenge(netadr_t& adr)
+int SV_GetChallenge(const netadr_t& adr)
 {
 	int i;
 #ifndef REHLDS_OPT_PEDANTIC
diff --git a/rehlds/engine/sv_user.cpp b/rehlds/engine/sv_user.cpp
index 450570e..51ee09f 100644
--- a/rehlds/engine/sv_user.cpp
+++ b/rehlds/engine/sv_user.cpp
@@ -1404,12 +1404,23 @@ void SV_RestoreMove(client_t *_host_client)
 /* <bf8bd> ../engine/sv_user.c:1736 */
 void SV_ParseStringCommand(client_t *pSenderClient)
 {
+	//check string commands rate for this player
+#ifdef REHLDS_FIXES
+	g_StringCommandsRateLimiter.StringCommandIssued(pSenderClient - g_psvs.clients);
+
+	if (!pSenderClient->active) {
+		return; //return if player was kicked
+	}
+#endif
+
 	char *s = MSG_ReadString();
 	int ret = SV_ValidateClientCommand(s);
 	switch (ret)
 	{
 	case 0:
+#ifndef REHLDS_OPT_PEDANTIC
 		if (Q_strlen(s) > 127)
+#endif
 		{
 			s[127] = 0;
 		}
diff --git a/rehlds/public/rehlds/rehlds_api.h b/rehlds/public/rehlds/rehlds_api.h
index 675d84d..f8ac00f 100644
--- a/rehlds/public/rehlds/rehlds_api.h
+++ b/rehlds/public/rehlds/rehlds_api.h
@@ -210,7 +210,7 @@ struct RehldsFuncs_t {
 	void(*MSG_EndBitWriting)(sizebuf_t *buf);
 	void*(*SZ_GetSpace)(sizebuf_t *buf, int length);
 	cvar_t*(*GetCvarVars)();
-	int (*SV_GetChallenge)(netadr_t& adr);
+	int (*SV_GetChallenge)(const netadr_t& adr);
 };
 
 class IRehldsApi {
diff --git a/rehlds/rehlds/rehlds_security.cpp b/rehlds/rehlds/rehlds_security.cpp
index b0c307c..92b339d 100644
--- a/rehlds/rehlds/rehlds_security.cpp
+++ b/rehlds/rehlds/rehlds_security.cpp
@@ -2,17 +2,19 @@
 
 cvar_t sv_rehlds_movecmdrate_max_avg = { "sv_rehlds_movecmdrate_max_avg", "750", 0, 750.0f, NULL };
 cvar_t sv_rehlds_movecmdrate_max_burst = { "sv_rehlds_movecmdrate_max_burst", "3500", 0, 3500.0f, NULL };
+cvar_t sv_rehlds_stringcmdrate_max_avg = {"sv_rehlds_stringcmdrate_max_avg", "32", 0, 32.0f, NULL};
+cvar_t sv_rehlds_stringcmdrate_max_burst = {"sv_rehlds_stringcmdrate_max_burst", "80", 0, 80.0f, NULL};
 
 CMoveCommandRateLimiter g_MoveCommandRateLimiter;
+CStringCommandsRateLimiter g_StringCommandsRateLimiter;
 
 CMoveCommandRateLimiter::CMoveCommandRateLimiter() {
 	memset(m_AverageMoveCmdRate, 0, sizeof(m_AverageMoveCmdRate));
 	memset(m_CurrentMoveCmds, 0, sizeof(m_CurrentMoveCmds));
-	m_LastCheckTime = 0;
+	m_LastCheckTime = 0.0;
 }
 
-void CMoveCommandRateLimiter::UpdateAverageRates(double currentTime) {
-	double dt = currentTime - m_LastCheckTime;
+void CMoveCommandRateLimiter::UpdateAverageRates(double dt) {
 	for (unsigned int i = 0; i < MAX_CLIENTS; i++) {
 		m_AverageMoveCmdRate[i] = (2.0 * m_AverageMoveCmdRate[i] / 3.0) + m_CurrentMoveCmds[i] / dt / 3.0;
 		m_CurrentMoveCmds[i] = 0;
@@ -29,24 +31,16 @@ void CMoveCommandRateLimiter::Frame() {
 		return;
 	}
 
-	UpdateAverageRates(currentTime);
+	UpdateAverageRates(dt);
 	m_LastCheckTime = currentTime;
 }
 
 void CMoveCommandRateLimiter::ClientConnected(unsigned int clientId) {
-	if (clientId >= (unsigned)g_psvs.maxclients) {
-		rehlds_syserror(__FUNCTION__": Invalid clientId %u", clientId);
-	}
-
 	m_CurrentMoveCmds[clientId] = 0;
 	m_AverageMoveCmdRate[clientId] = 0.0f;
 }
 
 void CMoveCommandRateLimiter::MoveCommandsIssued(unsigned int clientId, unsigned int numCmds) {
-	if (clientId >= (unsigned)g_psvs.maxclients) {
-		rehlds_syserror(__FUNCTION__": Invalid clientId %u", clientId);
-	}
-
 	m_CurrentMoveCmds[clientId] += numCmds;
 	CheckBurstRate(clientId);
 }
@@ -79,10 +73,77 @@ void CMoveCommandRateLimiter::CheckAverageRate(unsigned int clientId) {
 	}
 }
 
+CStringCommandsRateLimiter::CStringCommandsRateLimiter() {
+	memset(m_AverageStringCmdRate, 0, sizeof(m_AverageStringCmdRate));
+	memset(m_CurrentStringCmds, 0, sizeof(m_CurrentStringCmds));
+	m_LastCheckTime = 0.0;
+}
+
+void CStringCommandsRateLimiter::UpdateAverageRates(double dt) {
+	for (unsigned int i = 0; i < MAX_CLIENTS; i++) {
+		m_AverageStringCmdRate[i] = (2.0 * m_AverageStringCmdRate[i] / 3.0) + m_CurrentStringCmds[i] / dt / 3.0;
+		m_CurrentStringCmds[i] = 0;
+
+		CheckAverageRate(i);
+	}
+}
+
+void CStringCommandsRateLimiter::Frame() {
+	double currentTime = realtime;
+	double dt = currentTime - m_LastCheckTime;
+
+	if (dt < 0.5) { //refresh avg. rate every 0.5 sec
+		return;
+	}
+
+	UpdateAverageRates(dt);
+	m_LastCheckTime = currentTime;
+}
+
+void CStringCommandsRateLimiter::ClientConnected(unsigned int clientId) {
+	m_CurrentStringCmds[clientId] = 0;
+	m_AverageStringCmdRate[clientId] = 0.0f;
+}
+
+void CStringCommandsRateLimiter::StringCommandIssued(unsigned int clientId) {
+	m_CurrentStringCmds[clientId]++;
+	CheckBurstRate(clientId);
+}
+
+void CStringCommandsRateLimiter::CheckBurstRate(unsigned int clientId) {
+	client_t* cl = &g_psvs.clients[clientId];
+	if (!cl->active || sv_rehlds_stringcmdrate_max_burst.value <= 0.0f) {
+		return;
+	}
+
+	double dt = realtime - m_LastCheckTime;
+	if (dt < 0.2) {
+		dt = 0.2; //small intervals may give too high rates
+	}
+	if ((m_CurrentStringCmds[clientId] / dt) > sv_rehlds_stringcmdrate_max_burst.value) {
+		Cbuf_AddText(va("addip %i %s\n", 5, NET_BaseAdrToString(cl->netchan.remote_address)));
+		SV_DropClient(cl, false, "Banned for string commands flooding (burst)");
+	}
+}
+
+void CStringCommandsRateLimiter::CheckAverageRate(unsigned int clientId) {
+	client_t* cl = &g_psvs.clients[clientId];
+	if (!cl->active || sv_rehlds_stringcmdrate_max_burst.value <= 0.0f) {
+		return;
+	}
+
+	if (m_AverageStringCmdRate[clientId] > sv_rehlds_stringcmdrate_max_avg.value) {
+		Cbuf_AddText(va("addip %i %s\n", 5, NET_BaseAdrToString(cl->netchan.remote_address)));
+		SV_DropClient(cl, false, "Banned for string commands flooding (Avg)");
+	}
+}
+
 void Rehlds_Security_Init() {
 #ifdef REHLDS_FIXES
 	Cvar_RegisterVariable(&sv_rehlds_movecmdrate_max_avg);
 	Cvar_RegisterVariable(&sv_rehlds_movecmdrate_max_burst);
+	Cvar_RegisterVariable(&sv_rehlds_stringcmdrate_max_avg);
+	Cvar_RegisterVariable(&sv_rehlds_stringcmdrate_max_burst);
 #endif
 }
 
@@ -92,11 +153,13 @@ void Rehlds_Security_Shutdown() {
 void Rehlds_Security_Frame() {
 #ifdef REHLDS_FIXES
 	g_MoveCommandRateLimiter.Frame();
+	g_StringCommandsRateLimiter.Frame();
 #endif
 }
 
 void Rehlds_Security_ClientConnected(unsigned int clientId) {
 #ifdef REHLDS_FIXES
 	g_MoveCommandRateLimiter.ClientConnected(clientId);
+	g_StringCommandsRateLimiter.ClientConnected(clientId);
 #endif	
 }
\ No newline at end of file
diff --git a/rehlds/rehlds/rehlds_security.h b/rehlds/rehlds/rehlds_security.h
index 0fd3ac0..c287314 100644
--- a/rehlds/rehlds/rehlds_security.h
+++ b/rehlds/rehlds/rehlds_security.h
@@ -22,6 +22,26 @@ private:
 
 extern CMoveCommandRateLimiter g_MoveCommandRateLimiter;
 
+class CStringCommandsRateLimiter {
+public:
+	CStringCommandsRateLimiter();
+	void Frame();
+	void StringCommandIssued(unsigned int clientId);
+	void ClientConnected(unsigned int clientId);
+
+private:
+	void UpdateAverageRates(double currentTime);
+	void CheckBurstRate(unsigned int clientId);
+	void CheckAverageRate(unsigned int clientId);
+
+private:
+	float m_AverageStringCmdRate[MAX_CLIENTS];
+	int m_CurrentStringCmds[MAX_CLIENTS];
+	double m_LastCheckTime;
+};
+
+extern CStringCommandsRateLimiter g_StringCommandsRateLimiter;
+
 extern void Rehlds_Security_Init();
 extern void Rehlds_Security_Shutdown();
 extern void Rehlds_Security_Frame();