Gadu-Gadu 7.20 allows remote attackers to cause a denial of service (crash and configuration loss) via a page with a large number of gg: URIs.
Stack-based buffer overflow in Gadu-Gadu 7.20 allows remote attackers to cause a denial of service (crash) via an image filename between exactly 192 to 200 characters, which does not account for the "imgcache\" string that is added to the end of the buffer.
Memory leak in Gadu-Gadu 7.20 allows remote attackers to cause a denial of service via multiple DCC packets with a code other than 2 and a large size field, which allocates memory for the packet but does not free it after the packet has been dropped.