VulnerabilityModified
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.
HIGH 7.5EPSS 29.5%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 29.5%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
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."
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 29.46% probability · 98th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-399, CWE-400
- Affected
- openbsd/openssh
- Source
- cve@mitre.org
References
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=hIssue Tracking, Vendor Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markupIssue Tracking, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/10/19/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/10/20/1Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/93776Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037057Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1384860Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sigPatch, Vendor Advisory
- https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adIssue Tracking, Patch, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.ascThird Party Advisory
- https://security.gentoo.org/glsa/201612-18Third 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=hIssue Tracking, Vendor Advisory
- http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markupIssue Tracking, Vendor Advisory
- http://www.openwall.com/lists/oss-security/2016/10/19/3Mailing List, Third Party Advisory
- http://www.openwall.com/lists/oss-security/2016/10/20/1Mailing List, Third Party Advisory
- http://www.securityfocus.com/bid/93776Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037057Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1384860Issue Tracking
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sigPatch, Vendor Advisory
- https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adIssue Tracking, Patch, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.ascThird Party Advisory
- https://security.gentoo.org/glsa/201612-18Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180201-0001/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.