Code: void CtcpHandler::handleVersion(CtcpType ctcptype, const QString &prefix, const QString &target, const QString &param) {
   Q_UNUSED(target)
   if(ctcptype == CtcpQuery) {
    if(_ignoreListManager->ctcpMatch(prefix, network()->networkName(), "VERSION"))
      return;
    reply(nickFromMask(prefix), "VERSION", QString("Quassel IRC %1 (built on %2) -- http://www.quassel-irc.org")
          .arg(Quassel::buildInfo().plainVersionString)
          .arg(Quassel::buildInfo().buildDate));
     emit displayMsg(Message::Server, BufferInfo::StatusBuffer, "", tr("Received CTCP VERSION request by %1").arg(prefix));
   } else {
      str.append(tr(" with arguments: %1").arg(param));
    emit displayMsg(Message::Error, BufferInfo::StatusBuffer, "", str);
   }
 }

Commit Message: 
CWE ID: CWE-399
void CtcpHandler::handleVersion(CtcpType ctcptype, const QString &prefix, const QString &target, const QString &param) {
void CtcpHandler::handleVersion(CtcpType ctcptype, const QString &prefix, const QString &target, const QString &param, QString &reply) {
   Q_UNUSED(target)
   if(ctcptype == CtcpQuery) {
    reply = QString("Quassel IRC %1 (built on %2) -- http://www.quassel-irc.org").arg(Quassel::buildInfo().plainVersionString).arg(Quassel::buildInfo().buildDate);
     emit displayMsg(Message::Server, BufferInfo::StatusBuffer, "", tr("Received CTCP VERSION request by %1").arg(prefix));
   } else {
      str.append(tr(" with arguments: %1").arg(param));
    emit displayMsg(Message::Error, BufferInfo::StatusBuffer, "", str);
   }
 }
