Race condition in Squid 2.5.STABLE7 to 2.5.STABLE9, when using the Netscape Set-Cookie recommendations for handling cookies in caches, may cause Set-Cookie headers to be sent to other users, which allows attackers to steal the related cookies.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11169
https://exchange.xforce.ibmcloud.com/vulnerabilities/19581
http://www.squid-cache.org/Versions/v2/2.5/bugs/#squid-2.5.STABLE9-setcookie
http://www.securityfocus.com/bid/12716