CVE-2015-6563

MEDIUMNVD 6.46.4—
EchelonGraph scoreMEDIUM confidence

Score 6.4 from GitHub Security Advisory (severity: LOW) published 2022-05-14. NVD baseline CVSS 6.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.4
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.4Exploit: NoneExposed: 0

A fix is available — apply it.

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 v3
6.4
EG Score
6.4(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity64% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
30.7%
KEV
Not listed

Published

August 24, 2015

Last Modified

May 27, 2026

Advisory Details (4)

Auto-updated Jul 17, 2026
No patch confirmed yet.
generic

oss-security - Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities

http://www.openwall.com/lists/oss-security/2015/08/22/1
generic
http://www.openssh.com/txt/release-7.0
generic

Full Disclosure: BFS-SA-2015-002: OpenSSH PAM Privilege Separation Vulnerabilities

http://seclists.org/fulldisclosure/2015/Aug/54
generic
http://rhn.redhat.com/errata/RHSA-2016-0741.html

Vendor Advisories for CVE-2015-6563(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatopenssh-0:5.3p1-117.el62016-05-10redhat
redhatopenssh-0:6.6.1p1-22.el72015-11-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(2)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 14× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 107 total refreshes for this CVE.

  1. 2026-07-24 14:13 UTCEPSS rescore
  2. 2026-07-23 14:14 UTCEPSS rescore
  3. 2026-07-23 01:19 UTCEG score recompute
  4. 2026-07-23 00:21 UTCEG score recompute
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  15. 2026-07-17 06:50 UTCEG score recompute▲ 6.40
  16. 2026-07-17 06:50 UTCVendor advisory
  17. 2026-07-17 06:50 UTCGHSA enrichment
  18. 2026-07-16 16:59 UTCEPSS rescore
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  24. 2026-06-23 21:00 UTCOSV refresh
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  49. 2026-06-07 04:57 UTCOSV refresh
  50. 2026-06-06 13:45 UTCEPSS rescore
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  70. 2026-05-24 16:43 UTCEPSS rescore
  71. 2026-05-22 23:56 UTCEG score recompute
  72. 2026-05-22 23:56 UTCVendor advisory
  73. 2026-05-22 23:56 UTCGHSA enrichment
  74. 2026-05-22 21:15 UTCEPSS rescore
  75. 2026-05-21 22:40 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2015-6563?
CVE-2015-6563 is a medium vulnerability published on August 24, 2015. The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITORREQPAMINITCTX 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…
When was CVE-2015-6563 disclosed?
CVE-2015-6563 was first published in the National Vulnerability Database on August 24, 2015, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-6563 actively exploited?
CVE-2015-6563 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-6563?
CVE-2015-6563 has a CVSS v3 base score of 6.4 (NVD).
How do I remediate CVE-2015-6563?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-6563, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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