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CVE-2015-6563 (GCVE-0-2015-6563)

Vulnerability from cvelistv5 – Published: 2015-08-24 00:00 – Updated: 2026-05-27 16:11
VLAI
Summary
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.
Severity
6.4 (Medium)
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 16:11 UTC
CWE
  • n/a
  • CWE-20 - Improper Input Validation
Assigner
References
Date Public
2015-08-01 00:00
Show details on NVD website
To clipboard 

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    "nvd": "{\"cve\":{\"id\":\"CVE-2015-6563\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2015-08-24T01:59:00.127\",\"lastModified\":\"2026-05-27T17:16:22.720\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"Vulnerabilidad en el componente monitor en sshd en OpenSSH en versiones anteriores a 7.0 en plataformas no OpenBSD, acepta datos de nombre de usuario extra\u00f1os en las solicitudes MONITOR_REQ_PAM_INIT_CTX, lo que permite a usuarios locales llevar a cabo ataques de suplantaci\u00f3n aprovechando cualquier acceso de inicio de 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T12:15:54+00:00",
      "cve": "CVE-2015-6563",
      "id": "CVE-2015-6563",
      "initial_release_date": "2015-08-11T00:00:00+00:00",
      "product_status:fixed": "680",
      "product_status:known_affected": "2",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "openssh: Privilege separation weakness related to PAM support",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-6563.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-27T01:49:41Z",
      "cve": "CVE-2015-6563",
      "id": "CVE-2015-6563",
      "initial_release_date": "2023-02-15T05:15:17Z",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "5",
      "product_status:recommended": "92",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2015-6563",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-6563.json",
      "version": "10"
    },
    "vulnrichment": {
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      "cveMetadata": "{\"cveId\": \"CVE-2015-6563\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-27T16:11:52.468Z\", \"dateReserved\": \"2015-08-21T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2015-08-24T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.