Improper Input Validation Affecting openssh package, versions <1:6.9p1-1


Severity

Recommended
0.0
low
0
10

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Threat Intelligence

EPSS
0.38% (31st percentile)

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  • Snyk IDSNYK-ECHOLATEST-OPENSSH-17993824
  • published16 Jul 2026
  • disclosed24 Aug 2015

Introduced: 24 Aug 2015

CVE-2015-6563  (opens in a new tab)
CWE-20  (opens in a new tab)

How to fix?

Upgrade Echo:latest openssh to version 1:6.9p1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssh package and not the openssh package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.

CVSS Base Scores

version 3.1