CVE-2016-8858

Advisory lineage Upstream: 0 Downstream: 10
Modified
Published: 09 Dec 2016, 00:00
Last modified:29 May 2026, 20:45

Vulnerability Summary

Overall Risk (default)
medium
37/100
CVSS Score
7.8 HIGH
v2.0 (nvd)
EPSS Score
31.18% HIGH
31% probability +4.04%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

09 Dec 2016, 00:00
Published
Vulnerability first disclosed
29 May 2026, 20:45
Last Modified
Vulnerability information updated

Description

The kex_input_kexinit function in kex.c in OpenSSH 6.x and 7.x through 7.3 allows remote attackers to cause a denial of service (memory consumption) by sending many duplicate KEXINIT requests. NOTE: a third party reports that "OpenSSH upstream does not consider this as a security issue."

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v3.0•HIGH•Score: 7.5CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•HIGH•Score: 7.8AV:N/AC:L/Au:N/C:N/I:N/A:C

EPSS Trends

Current EPSS score: 31.18%• Percentile: 97%

Techniques & Countermeasures

  • CWE-399•Resource Management Errors

    Weaknesses in this category are related to improper management of system resources.

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • openbsd•openssh

    6.8 | 6.9 | 7.0 | 7.1 | 7.2 | 7.3

References (13)