CVEvulnerability

CVE-2016-8858

7.5 HIGH Published 2016-12-09 Modified 2026-06-17 Official page ↗

Status: Modified
Published: 2016-12-09
Last modified: 2026-06-17
Assigner: [email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0): 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.0 ([email protected]): 7.5 HIGH — CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected]): 7.8 HIGH — AV:N/AC:L/Au:N/C:N/I:N/A:C
Weaknesses: CWE-399, CWE-400

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."

Affected configurations

• openbsd openssh 6.8 • openbsd openssh 6.9 • openbsd openssh 7.0 • openbsd openssh 7.1 • openbsd openssh 7.2 • openbsd openssh 7.3

Weakness · not in database (1)

CWE-399

Weakness · CWE (1)

CWE-400 Uncontrolled Resource Consumption weakness

References

http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h Issue Tracking, Vendor Advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup Issue Tracking, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/93776 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037057 Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf cert-portal.siemens.com
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch, Vendor Advisory
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking, Patch, Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc Third Party Advisory
https://security.gentoo.org/glsa/201612-18 Third Party Advisory
https://security.netapp.com/advisory/ntap-20180201-0001/ Third Party Advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=h Issue Tracking, Vendor Advisory
http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markup Issue Tracking, Vendor Advisory
http://www.openwall.com/lists/oss-security/2016/10/19/3 Mailing List, Third Party Advisory
http://www.openwall.com/lists/oss-security/2016/10/20/1 Mailing List, Third Party Advisory
http://www.securityfocus.com/bid/93776 Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037057 Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1384860 Issue Tracking
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf cert-portal.siemens.com
https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sig Patch, Vendor Advisory
https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89ad Issue Tracking, Patch, Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.asc Third Party Advisory
https://security.gentoo.org/glsa/201612-18 Third Party Advisory
https://security.netapp.com/advisory/ntap-20180201-0001/ Third Party Advisory