CVE-2016-8858

HOCH 7.5CVE-2016-8858 · Published 09/12/2016 · updated 17/06/2026

Package	Affected versions	Patched versions
openssh openbsd	`= 6.8= 6.9= 7.0= 7.1= 7.2= 7.3`	No fix yet

Description

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

References

cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff · Issue Tracking
cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c · Issue Tracking
openwall.com/lists/oss-security/2016/10/19/3 · Mailing List
openwall.com/lists/oss-security/2016/10/20/1 · Mailing List
securityfocus.com/bid/93776 · Third Party Advisory
securitytracker.com/id/1037057 · Third Party Advisory
bugzilla.redhat.com/show_bug.cgi · Issue Tracking
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig · Patch
openssh/openssh-portable commit ec165c3 · Issue Tracking
security.freebsd.org/advisories/FreeBSD-SA-16:33.openssh.asc · Third Party Advisory
security.gentoo.org/glsa/201612-18 · Third Party Advisory
security.netapp.com/advisory/ntap-20180201-0001 · Third Party Advisory

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