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7.8
CVSSv2

CVE-2016-8858

Published: 09/12/2016 Updated: 11/04/2024
CVSS v2 Base Score: 7.8 | Impact Score: 6.9 | Exploitability Score: 10
CVSS v3 Base Score: 7.5 | Impact Score: 3.6 | Exploitability Score: 3.9
VMScore: 695
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C
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Vulnerability Summary

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x up to and including 7.3 allows remote malicious users 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."

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Vendor Advisories

Debian CVElist Bug Report Logs: openssh: CVE-2016-8858: Memory exhaustion due to unregistered KEXINIT handler after receiving message
Debian Bug report logs - #841884 openssh: CVE-2016-8858: Memory exhaustion due to unregistered KEXINIT handler after receiving message Package: src:openssh; Maintainer for src:openssh is Debian OpenSSH Maintainers <debian-ssh@listsdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Mon, 24 Oct 20 ...

ICS Advisories

Siemens SCALANCE X-200RNA Switch Devices

References

CWE-399http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diff?r1=1.126&r2=1.127&f=hhttp://www.openwall.com/lists/oss-security/2016/10/20/1http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c?rev=1.127&content-type=text/x-cvsweb-markuphttp://www.openwall.com/lists/oss-security/2016/10/19/3https://github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adhttp://www.securityfocus.com/bid/93776https://bugzilla.redhat.com/show_bug.cgi?id=1384860https://ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.sighttps://security.gentoo.org/glsa/201612-18http://www.securitytracker.com/id/1037057https://security.FreeBSD.org/advisories/FreeBSD-SA-16:33.openssh.aschttps://security.netapp.com/advisory/ntap-20180201-0001/https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdfhttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=841884https://nvd.nist.govhttps://www.cisa.gov/uscert/ics/advisories/icsa-22-349-21
CVSSv2
CVSSv2
CVSSv3
VMScore
Recommendations:
CVE-2023-38298CVE-2024-20356CVE-2023-21987CVE-2024-33217bypassCVE-2024-31804CVE-2024-32660unauthorizedSSRF
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