The silc_pkcs1_decode function in the silccrypt library (silcpkcs1.c) in Secure Internet Live Conferencing (SILC) Toolkit before 1.1.7, SILC Client before 1.1.4, and SILC Server before 1.1.2 allows remote attackers to execute arbitrary code via a crafted PKCS#1 message, which triggers an integer underflow, signedness error, and a buffer overflow. NOTE: the researcher describes this as an integer overflow, but CVE uses the "underflow" term in cases of wraparound from unsigned subtraction.

Secure Internet Live Conferencing (SILC) Server before 1.1.1 allows remote attackers to cause a denial of service (daemon crash) via a NEW_CLIENT packet without a nickname.

Stack-based buffer overflow in the silc_fingerprint function in lib/silcutil/silcutil.c in Secure Internet Live Conferencing (SILC) Toolkit 1.1.5, and unspecified earlier versions, allows remote attackers to cause a denial of service (crash) or possibly execute arbitrary code via long input data. NOTE: some of these details are obtained from third party information.

Buffer overflow in lib/silcclient/client_notify.c of SILC Client and SILC Toolkit before 1.1.2 allows remote attackers to cause a denial of service via "NICK_CHANGE" notifications.

The SILC_SERVER_CMD_FUNC function in apps/silcd/command.c in silc-server 1.0.2 allows remote attackers to cause a denial of service (NULL dereference and daemon crash) via a request without a cipher algorithm and an invalid HMAC algorithm.

silc daemon (silcd.c) in Secure Internet Live Conferencing (SILC) 1.0 and earlier allows local users to overwrite arbitrary files via a symlink attack on the silcd.[PID].stats temporary file.

Secure Internet Live Conferencing (SILC) 0.9.11 and 0.9.12 stores passwords and sessions in plaintext in memory, which could allow local users to obtain sensitive information.