Format string vulnerability in the cherokee_logger_ncsa_write_string function in Cherokee 0.4.17 and earlier, when authenticating via auth_pam, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via format string specifiers in the URL.
https://exchange.xforce.ibmcloud.com/vulnerabilities/17934
http://www.securityfocus.com/bid/11574