Vulnerability Monitor

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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 privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.

Security Impact Summary

This vulnerability carries a CRITICAL severity rating with a CVSS v3.1 score of 9.8, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), and availability (service disruption) for affected systems. Impacting 9 products from openbsd, from debian, from oracle and 6 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2017, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2017-04-11T18:59:00.167

Last Modified

2026-05-13T00:24:29.033

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.8 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:P/A:P

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: PARTIAL
  • Integrity Impact: PARTIAL
  • Availability Impact: PARTIAL
Exploitability Score

10.0

Impact Score

6.4

Weaknesses
  • Type: Primary
    CWE-287
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application openbsd openssh < 7.2 Yes
Operating System debian debian_linux 8.0 Yes
Operating System oracle linux 6 Yes
Operating System oracle linux 7 Yes
Operating System redhat enterprise_linux_desktop 6.0 Yes
Operating System redhat enterprise_linux_desktop 7.0 Yes
Operating System redhat enterprise_linux_eus 7.2 Yes
Operating System redhat enterprise_linux_eus 7.3 Yes
Operating System redhat enterprise_linux_eus 7.4 Yes
Operating System redhat enterprise_linux_eus 7.5 Yes
Operating System redhat enterprise_linux_eus 7.6 Yes
Operating System redhat enterprise_linux_eus 7.7 Yes
Operating System redhat enterprise_linux_server 6.0 Yes
Operating System redhat enterprise_linux_server 7.0 Yes
Operating System redhat enterprise_linux_server_aus 7.2 Yes
Operating System redhat enterprise_linux_server_aus 7.3 Yes
Operating System redhat enterprise_linux_server_aus 7.4 Yes
Operating System redhat enterprise_linux_server_aus 7.6 Yes
Operating System redhat enterprise_linux_server_aus 7.7 Yes
Operating System redhat enterprise_linux_server_tus 7.2 Yes
Operating System redhat enterprise_linux_server_tus 7.3 Yes
Operating System redhat enterprise_linux_server_tus 7.6 Yes
Operating System redhat enterprise_linux_server_tus 7.7 Yes
Operating System redhat enterprise_linux_workstation 6.0 Yes
Operating System redhat enterprise_linux_workstation 7.0 Yes
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For openbsd's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.