Index: src/libs/zbxcommon/misc.c
===================================================================
--- src/libs/zbxcommon/misc.c	(revision 34458)
+++ src/libs/zbxcommon/misc.c	(working copy)
@@ -1322,6 +1322,7 @@
 {
 	size_t	i, len;
 	char	dot = 0;
+	char    exponent = 0;
 
 	for (i = 0; ' ' == str[i] && '\0' != str[i]; i++)	/* trim left spaces */
 		;
@@ -1335,12 +1336,27 @@
 		if (0 != isdigit(str[i]))
 			continue;
 
-		if ('.' == str[i] && 0 == dot)
+		if ('.' == str[i] && 0 == dot && exponent == 0)
 		{
 			dot = 1;
 			continue;
 		}
 
+		/* Check for exponent */
+		if (exponent == 0 && ('e' == str[i] || 'E' == str[i]))
+		{
+			i++;
+		    len++;
+		    exponent = 1;
+		    /* Exponent must be followed by +/- or a digit */
+		    if ('+' == str[i] || '-' == str[i] || 0 != isdigit(str[i]))
+			{
+				continue;
+			}
+			
+			return FAIL;
+		}
+
 		if (' ' == str[i])	/* check right spaces */
 		{
 			for (; ' ' == str[i] && '\0' != str[i]; i++)	/* trim right spaces */