'Internal method to check if a vuln is present into a vulns list
coming from method "find_vulns()".
:param vuln_desc: Vuln description.
:param vulns_list: vulns list coming from method "find_vulns()".
:return: True only if vuln is found.'

def _vuln_exists(self, vuln_desc, vulns_list):

    for v in vulns_list:
        if (v.desc == vuln_desc):
            return True
    return False
