Xlight 1.52, with log to screen enabled, allows remote attackers to cause a denial of service by requesting a long directory consisting of . (dot) and / (slash) characters, which causes the server to crash when the administrator views the log file, possibly triggering a buffer overflow.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15064
https://euvd.enisa.europa.eu/vulnerability/EUVD-2004-0255