# CVE-2015-6563

## Summary

- **CVE ID:** CVE-2015-6563
- **Severity:** MEDIUM
- **CVSS Score:** 6.4 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Aug 24, 2015
- **Last Modified:** May 27, 2026

## Description

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.

## Affected Products

- n/a — n/a (n/a)

## References

- [CNA](http://www.openwall.com/lists/oss-security/2015/08/22/1)
- [CNA](http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html)
- [CNA](http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html)
- [CNA](https://support.apple.com/HT205375)
- [CNA](http://www.securityfocus.com/bid/76317)
- [CNA](https://github.com/openssh/openssh-portable/commit/d4697fe9a28dab7255c60433e4dd23cf7fce8a8b)
- [CNA](http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html)
- [CNA](https://security.gentoo.org/glsa/201512-04)
- [CNA](http://www.openssh.com/txt/release-7.0)
- [CNA](http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html)
- [CNA](http://rhn.redhat.com/errata/RHSA-2016-0741.html)
- [CNA](http://seclists.org/fulldisclosure/2015/Aug/54)
- [CNA](http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html)
- [CNA](http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html)
- [CNA](https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html)
- [CNA](https://security.netapp.com/advisory/ntap-20180201-0002/)
- [CNA](https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-766)
- [CNA](https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.10%
- **EPSS Percentile:** 27.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._