High severity7.5NVD Advisory· Published Dec 9, 2016· Updated Jun 17, 2026
CVE-2016-8858
CVE-2016-8858
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."
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
43cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:a:openbsd:openssh:6.8:*:*:*:*:*:*:*
- cpe:2.3:a:openbsd:openssh:6.9:*:*:*:*:*:*:*
- cpe:2.3:a:openbsd:openssh:7.0:*:*:*:*:*:*:*
- cpe:2.3:a:openbsd:openssh:7.1:*:*:*:*:*:*:*
- cpe:2.3:a:openbsd:openssh:7.2:*:*:*:*:*:*:*
- cpe:2.3:a:openbsd:openssh:7.3:*:*:*:*:*:*:*
- osv-coords36 versionspkg:rpm/opensuse/openssh&distro=openSUSE%20Tumbleweedpkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP1pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP2pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSSpkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATApkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2012-LTSSpkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20Raspberry%20Pi%2012%20SP2pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Manager%202.1pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Manager%20Proxy%202.1pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20OpenStack%20Cloud%205pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP1pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP2pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSSpkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATApkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2012-LTSSpkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20Raspberry%20Pi%2012%20SP2pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg:rpm/suse/openssh&distro=SUSE%20Manager%202.1pkg:rpm/suse/openssh&distro=SUSE%20Manager%20Proxy%202.1pkg:rpm/suse/openssh&distro=SUSE%20OpenStack%20Cloud%205pkg:rpm/suse/openssh-openssl1&distro=SUSE%20Linux%20Enterprise%20Server%2011-SECURITY
< 8.4p1-7.4+ 35 more
- (no CPE)range: < 8.4p1-7.4
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.6p1-35.4
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.3
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.3
- (no CPE)range: < 6.6p1-35.4
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.2p2-0.40.3
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.6p1-35.1
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.1
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.1
- (no CPE)range: < 6.6p1-35.1
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 6.6p1-54.7.1
- (no CPE)range: < 7.2p2-66.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.2p2-0.40.1
- (no CPE)range: < 6.6p1-18.1
Patches
Vulnerability mechanics
References
13- ftp.openbsd.org/pub/OpenBSD/patches/6.0/common/013_ssh_kexinit.patch.signvdPatchVendor Advisory
- github.com/openssh/openssh-portable/commit/ec165c392ca54317dbe3064a8c200de6531e89adnvdIssue TrackingPatchThird Party Advisory
- cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.c.diffnvdIssue TrackingVendor Advisory
- cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/kex.cnvdIssue TrackingVendor Advisory
- www.openwall.com/lists/oss-security/2016/10/19/3nvdMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2016/10/20/1nvdMailing ListThird Party Advisory
- www.securityfocus.com/bid/93776nvdThird Party AdvisoryVDB Entry
- www.securitytracker.com/id/1037057nvdThird Party AdvisoryVDB Entry
- security.freebsd.org/advisories/FreeBSD-SA-16:33.openssh.ascnvdThird Party Advisory
- security.gentoo.org/glsa/201612-18nvdThird Party Advisory
- security.netapp.com/advisory/ntap-20180201-0001/nvdThird Party Advisory
- bugzilla.redhat.com/show_bug.cginvdIssue Tracking
- cert-portal.siemens.com/productcert/pdf/ssa-412672.pdfnvd
News mentions
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