Medium 6.4Published Aug 23, 2015

CVE-2015-6563The 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 a…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

Does this affect you?

It affects openbsd openssh and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stackFree account, 3 products Every CVE for openbsd openssh Exploited in the last 30 days

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: 6.4 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-20
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

openbsd openssh openbsd:openssh	through 6.9	NVD
apple mac_os_x apple:mac_os_x	through 10.11.0	NVD

References

References

http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
http://rhn.redhat.com/errata/RHSA-2016-0741.html
http://seclists.org/fulldisclosure/2015/Aug/54
http://www.openssh.com/txt/release-7.0	vendor-advisory
http://www.openwall.com/lists/oss-security/2015/08/22/1
http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
1–10 of 18

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.