CVE-2016-8858
HIGH 7.5EPSS 29.5%
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."
- CVSS v3.1 CNA
- 7.5 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS v3.0 NVD
- 7.5 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS v2.0 NVD
- 7.8 HIGH
AV:N/AC:L/Au:N/C:N/I:N/A:C - EPSS
- 29.46% chance of exploitation in the next 30 days, 98th percentile
- Published
- 2016-12-09
- Updated
- 2026-05-29
Proof-of-concept exploits (1)
- dag-erling/kexkill7★ · 2018-09-17
Security advisories
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=tex…
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig
- http://www.openwall.com/lists/oss-security/2016/10/19/3
- http://www.openwall.com/lists/oss-security/2016/10/20/1
- http://www.securityfocus.com/bid/93776
- http://www.securitytracker.com/id/1037057
- openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc
- https://security.gentoo.org/glsa/201612-18
- https://security.netapp.com/advisory/ntap-20180201-0001
- https://bugzilla.redhat.com/show_bug.cgi?id=1384860