CVE-2016-8858

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."
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
7.5 HIGH
NETWORK
LOW
NONE
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
mitreCNA
---
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CVEADP
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Base Score
CVSS 3.x
EPSS Score
Percentile: 98%
VendorProductVersion
openbsdopenssh
6.8
openbsdopenssh
6.9
openbsdopenssh
7.0
openbsdopenssh
7.1
openbsdopenssh
7.2
openbsdopenssh
7.3
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
openssh
bullseye (security)
1:8.4p1-5+deb11u3
fixed
bullseye
1:8.4p1-5+deb11u3
fixed
jessie
ignored
wheezy
no-dsa
bookworm
1:9.2p1-2+deb12u3
fixed
bookworm (security)
1:9.2p1-2+deb12u3
fixed
sid
1:9.9p1-3
fixed
trixie
1:9.9p1-3
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
openssh
artful
not-affected
zesty
not-affected
yakkety
ignored
xenial
ignored
trusty
ignored
precise
ignored
Common Weakness Enumeration
References
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=text/x-cvsweb-markup
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
https://bugzilla.redhat.com/show_bug.cgi?id=1384860
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig
https://github.com/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/
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=text/x-cvsweb-markup
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
https://bugzilla.redhat.com/show_bug.cgi?id=1384860
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig
https://github.com/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/