Multiple CRLF injection vulnerabilities in webadmin in ZNC before 0.066 allow remote authenticated users to modify the znc.conf configuration file and gain privileges via CRLF sequences in the quit message and other vectors.

ZNC 1.0 allows remote authenticated users to cause a denial of service (NULL pointer reference and crash) via a crafted request to the (1) editnetwork, (2) editchan, (3) addchan, or (4) delchan page in modules/webadmin.cpp.

Last updated 26 August 2025

Last updated 25 August 2025

Multiple unspecified vulnerabilities in ZNC 0.092 allow remote attackers to cause a denial of service (exception and daemon crash) via unknown vectors related to "unsafe substr() calls."

An out-of-range flaw was found in znc where if it received a "PING" from a client without an argument, std::string would throw a std::outofrange exception which killed znc. This is fixed in subversion [1].

Some unsafe substr() calls were fixed as well. These are of lesser impact because a valid login is required in order to cause a std::outofrange exception. This is also fixed in subversion [2].

[1] http://znc.svn.sourceforge.net/viewvc/znc?view=revision&revision=2093 [2] http://znc.svn.sourceforge.net/viewvc/znc?view=revision&revision=2095

NULL pointer dereference vulnerability in ZNC before 0.092 caused by traffic stats when there are unauthenticated connections.

An out-of-range flaw was found in znc where if it received a "PING" from a client without an argument, std::string would throw a std::outofrange exception which killed znc. This is fixed in subversion [1].

Some unsafe substr() calls were fixed as well. These are of lesser impact because a valid login is required in order to cause a std::outofrange exception. This is also fixed in subversion [2].

[1] http://znc.svn.sourceforge.net/viewvc/znc?view=revision&revision=2093 [2] http://znc.svn.sourceforge.net/viewvc/znc?view=revision&revision=2095