CVE-2016-1908
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…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 13.7%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 13.74% probability · 97th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-287
- Affected
- openbsd/openssh · debian/debian linux · oracle/linux · redhat/enterprise linux desktop · redhat/enterprise linux eus · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server tus · redhat/enterprise linux workstation
- Source
- secalert@redhat.com
EPSS 13.7% since 4 November 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://openwall.com/lists/oss-security/2016/01/15/13Mailing List, Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0465.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0741.htmlThird Party Advisory
- http://www.openssh.com/txt/release-7.2Release Notes, Vendor Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
- http://www.securityfocus.com/bid/84427Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034705Broken Link, Third Party Advisory, VDB Entry
- https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cPatch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1298741Issue Tracking, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201612-18Third Party Advisory
- http://openwall.com/lists/oss-security/2016/01/15/13Mailing List, Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0465.htmlThird Party Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0741.htmlThird Party Advisory
- http://www.openssh.com/txt/release-7.2Release Notes, Vendor Advisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
- http://www.securityfocus.com/bid/84427Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1034705Broken Link, Third Party Advisory, VDB Entry
- https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cPatch, Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1298741Issue Tracking, Patch, Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- https://lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201612-18Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.