CVE-2017-5194

In Irssi before version 1.0.5, overlong nicks or targets may result in a NULL pointer dereference while splitting the message.

In Irssi before version 1.0.5, certain incorrectly formatted DCC CTCP messages could lead to a NULL pointer dereference.

Irssi before 1.0.5, when installing themes with unterminated colour formatting sequences, may access data beyond the end of the string.

Irssi before 1.0.5 may incorrectly fail to remove destroyed channels from the query list while waiting for channel synchronization, leading to use-after-free conditions when updating the state later on.

In Irssi before version 1.0.3, when receiving certain incorrectly quoted DCC files, it tries to find the terminating quote one byte before the allocated memory. This may lead to application crashes.

In Irssi before version 1.0.3, when receiving a DCC message without source nick/host, it attempts to dereference a NULL pointer. This can lead to application crashes.

Irssi before 0.8.21 allows remote attackers to cause a denial of service (out-of-bounds read and crash) via a string containing a formatting sequence (%[) without a closing bracket (]).

Irssi versions 0.8.18 and earlier before 0.8.21 allow remote attackers to cause a denial of service (out-of-bounds read and crash) via vectors involving strings that are not UTF8.

Irssi versions 0.8.17 and earlier before 0.8.21 are vulnerable to an attack that can lead to denial of service through a crafted ANSI x8 color code causing an out-of-bounds read and application crash.

The nickcmp function in Irssi before version 0.8.21 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a message without a nick.