Apply by doing:
       cd /usr/src
       patch -p0 < 023_mod_ssl.patch

And then rebuild and install httpd and its modules:
       cd usr.sbin/httpd
       make -f Makefile.bsd-wrapper obj
       make -f Makefile.bsd-wrapper cleandir
       make -f Makefile.bsd-wrapper depend
       make -f Makefile.bsd-wrapper
       make -f Makefile.bsd-wrapper install

If httpd had been started, you might want to run
       apachectl stop
before running "make install", and
       apachectl start
afterwards.

Index: usr.sbin/httpd/src/modules/ssl/ssl_engine_compat.c
===================================================================
RCS file: /cvs/src/usr.sbin/httpd/src/modules/ssl/ssl_engine_compat.c,v
retrieving revision 1.6
retrieving revision 1.6.4.1
diff -u -r1.6 -r1.6.4.1
--- usr.sbin/httpd/src/modules/ssl/ssl_engine_compat.c  2001/03/29 10:21:46     1.6
+++ usr.sbin/httpd/src/modules/ssl/ssl_engine_compat.c  2002/06/24 08:05:13     1.6.4.1
@@ -309,7 +309,8 @@
     * Extract directive name
     */
    cp = (char *)oline;
-    for (i = 0; *cp != ' ' && *cp != '\t' && *cp != NUL && i < 1024; )
+    for (i = 0; *cp != ' ' && *cp != '\t' && *cp != NUL &&
+               i < sizeof(caCmd) - 1; )
        caCmd[i++] = *cp++;
    caCmd[i] = NUL;
    cpArgs = cp;