diff -burN tcsh-6.20.00.orig/ed.chared.c tcsh-6.20.00/ed.chared.c
--- tcsh-6.20.00.orig/ed.chared.c	2015-08-19 17:29:55.000000000 +0300
+++ tcsh-6.20.00/ed.chared.c	2017-07-20 15:59:24.567159098 +0300
@@ -3387,7 +3387,7 @@
 CCRETVAL
 e_stuff_char(Char c)
 {
-#ifdef TIOCSTI
+#if 0 /* avoid CVE-2017-5226 issues */
      int was_raw = Tty_raw_mode;
      char buf[MB_LEN_MAX];
      size_t i, len;