Stack buffer overflow (stack overrun) during TCP/7205 TCP/7211 HTTP basic authentication on base64 decoding.
CVE:
CVE-2007-2171 (Stack-based buffer overflow in the base64_decode function in GWINTER.exe in Novell GroupWise (GW) WebAccess before 7.0 SP2 allows remote attackers to execute arbitrary code via long base64 content in an HTTP Basic Authentication request.)