DeleGate 9.9.13 allows local users to gain privileges as demonstrated by the dgcpnod setuid program.

Multiple unspecified vulnerabilities in DeleGate 9.x before 9.0.6 and 8.x before 8.11.6 allow remote attackers to cause a denial of service via crafted DNS responses messages that cause (1) a buffer over-read or (2) infinite recursion, which can trigger a segmentation fault or invalid memory access, as demonstrated by the OUSPG PROTOS DNS test suite.

The DNS implementation in DeleGate 8.10.2 and earlier allows remote attackers to cause a denial of service via a compressed DNS packet with a label length byte with an incorrect offset, which could trigger an infinite loop.

Multiple buffer overflows in DeleGate before 8.11.1 may allow attackers to cause a denial of service or execute arbitrary code, possibly due to "overflows on arrays."

Multiple implementations of the DNS protocol, including (1) Poslib 1.0.2-1 and earlier as used by Posadis, (2) Axis Network products before firmware 3.13, and (3) Men & Mice Suite 2.2x before 2.2.3 and 3.5.x before 3.5.2, allow remote attackers to cause a denial of service (CPU and network bandwidth consumption) by triggering a communications loop via (a) DNS query packets with localhost as a spoofed source address, or (b) a response packet that triggers a response packet.

Buffer overflow in the ssl_prcert function in the SSLway filter (sslway.c) for DeleGate 8.9.2 and earlier allows remote attackers to execute arbitrary code via a certificate with a long (1) subject or (2) issuer name field.

Multiple buffer overflows in DeleGate 7.7.0 through 7.8.1 allow remote attackers to execute arbitrary code, as demonstrated using a long USER command to the POP proxy.

Cross-site scripting vulnerability in DeleGate 7.7.0 and 7.7.1 does not quote scripting commands within a "403 Forbidden" error page, which allows remote attackers to execute arbitrary Javascript on other clients via a URL that generates an error.

Delegate proxy 5.9.3 and earlier creates files and directories in the DGROOT with world-writable permissions.