VULNERABILITY INTELLIGENCE

CVE-2016-1908

CVSS score9.8 CRITICAL
EPSS probability13.74%
CISA KEVNot currently listed
Published2017-04-11
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • CWE-287: Improper Authentication

Primary references