CVE-2016-1908

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 14%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
96.1%
KEV
Not listed

Published

April 11, 2017

Last Modified

May 29, 2026

Advisory Details (8)

Auto-updated Jun 20, 2026
Patch available. Sources: redhat.
redhat Patch Available

1298741 – (CVE-2016-1908) CVE-2016-1908 openssh: possible fallback from untrusted to trusted X11 forwarding

Affected: Red Hat Enterprise Linux 7 and current Fedora versions. The X server does not have X Security extension compiled in and 'xhos

https://bugzilla.redhat.com/show_bug.cgi?id=1298741
generic

openssh.git - Portable OpenSSH

https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c
generic
http://www.securitytracker.com/id/1034705
generic
http://www.securityfocus.com/bid/84427
generic
http://www.openssh.com/txt/release-7.2
generic
http://rhn.redhat.com/errata/RHSA-2016-0741.html
generic
http://rhn.redhat.com/errata/RHSA-2016-0465.html
generic

oss-security - Re: Qualys Security Advisory - Roaming through the OpenSSH client: CVE-2016-0777 and CVE-2016-0778

http://openwall.com/lists/oss-security/2016/01/15/13

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenssh-server (1:6.9p1-2ubuntu0.2) @ wily2026-05-20ubuntu
redhatopenssh-0:5.3p1-117.el62016-05-10redhat
redhatopenssh-0:6.6.1p1-25.el7_22016-03-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(3)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 11× in last 7d / 39× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 113 total refreshes for this CVE.

  1. 2026-07-23 14:14 UTCEPSS rescore
  2. 2026-07-23 01:22 UTCEG score recompute
  3. 2026-07-22 22:01 UTCEG score recompute
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  67. 2026-05-20 11:05 UTCVendor advisory
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  73. 2026-05-19 23:14 UTCVendor advisory
  74. 2026-05-19 23:14 UTCGHSA enrichment
  75. 2026-05-19 19:17 UTCVendor advisory

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Frequently asked(5)

What is CVE-2016-1908?
CVE-2016-1908 is a critical vulnerability published on April 11, 2017. 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…
When was CVE-2016-1908 disclosed?
CVE-2016-1908 was first published in the National Vulnerability Database on April 11, 2017, with the most recent update on May 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2016-1908 actively exploited?
CVE-2016-1908 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 96.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2016-1908?
CVE-2016-1908 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2016-1908?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2016-1908, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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