openbsd 7.9 · errata 041
By sending crafted IKEv1 messages, an unauthenticated remote attacker could crash isakmpd(8) due to a NULL pointer dereference, out-of-bounds memory accesses or a double free.
installera
# syspatch
källpatch
signify -Vep /etc/signify/openbsd-79-base.pub -x 041_isakmpd.patch.sig \
-m - | (cd /usr/src && patch -p0)
And then rebuild and install isakmpd:
cd /usr/src/sbin/isakmpd
make obj
make
make install