Critical severity9.8NVD Advisory· Published Apr 11, 2017· Updated Jun 17, 2026

CVE-2016-1908

Description

The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

OpenBSD/OpenSSH
cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Range: <7.2
Debian/linux
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
Oracle Corporation/Linux2 versions
cpe:2.3:o:oracle:linux:6:-:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:oracle:linux:6:-:*:*:*:*:*:*
- cpe:2.3:o:oracle:linux:7:-:*:*:*:*:*:*
Red Hat/Enterprise Linux Desktop2 versions
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Eus6 versions
cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:*+ 5 more
- cpe:2.3:o:redhat:enterprise_linux_eus:7.2:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:7.5:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_eus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server2 versions
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server Aus5 versions
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server Tus4 versions
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*+ 3 more
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Workstation2 versions
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
OpenSSH/OpenSSHllm-fuzzy
Range: <7.2
osv-coords29 versions
pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Desktop%2012 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP1 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSS pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATA pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2012 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Manager%202.1 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20Manager%20Proxy%202.1 pkg:rpm/suse/openssh-askpass-gnome&distro=SUSE%20OpenStack%20Cloud%205 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Desktop%2012 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP1 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSS pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATA pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2012 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012 pkg:rpm/suse/openssh&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1 pkg:rpm/suse/openssh&distro=SUSE%20Manager%202.1 pkg:rpm/suse/openssh&distro=SUSE%20Manager%20Proxy%202.1 pkg:rpm/suse/openssh&distro=SUSE%20OpenStack%20Cloud%205 pkg:rpm/suse/openssh-openssl1&distro=SUSE%20Linux%20Enterprise%20Server%2011-SECURITY
< 6.6p1-42.1+ 28 more
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.6p1-21.3
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-21.3
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.2p2-0.33.5
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.6p1-21.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-21.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.6p1-42.1
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.2p2-0.33.2
- (no CPE)range: < 6.6p1-15.1

Patches

Vulnerability mechanics

References

anongit.mindrot.org/openssh.git/commit/nvdPatchThird Party Advisory
bugzilla.redhat.com/show_bug.cginvdIssue TrackingPatchThird Party Advisory
openwall.com/lists/oss-security/2016/01/15/13nvdMailing ListThird Party Advisory
rhn.redhat.com/errata/RHSA-2016-0465.htmlnvdThird Party Advisory
rhn.redhat.com/errata/RHSA-2016-0741.htmlnvdThird Party Advisory
www.openssh.com/txt/release-7.2nvdRelease NotesVendor Advisory
www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlnvdThird Party Advisory
www.securityfocus.com/bid/84427nvdThird Party AdvisoryVDB Entry
www.securitytracker.com/id/1034705nvdBroken LinkThird Party AdvisoryVDB Entry
lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlnvdMailing ListThird Party Advisory
security.gentoo.org/glsa/201612-18nvdThird Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-412672.pdfnvd

News mentions

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cvss	0.637
epss	0.011
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000