CVE-2015-6564 (GCVE-0-2015-6564)
Vulnerability from cvelistv5 – Published: 2015-08-24 00:00 – Updated: 2026-05-27 16:18
VLAI
EPSS
VEX
Summary
Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 16:18 UTC
CWE
- n/a
- CWE-416 - Use After Free
Assigner
References
16 references
Date Public
2015-08-01 00:00
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2015-6564",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-05-27T16:18:01.378706Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-05-27T16:17:53.954Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
{
"status": "affected",
"version": "n/a"
}
]
}
],
"datePublic": "2015-08-01T00:00:00.000Z",
"descriptions": [
{
"lang": "en",
"value": "Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request."
}
],
"problemTypes": [
{
"descriptions": [
{
"description": "n/a",
"lang": "en",
"type": "text"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2022-12-13T00:00:00.000Z",
"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"shortName": "mitre"
},
"references": [
{
"name": "[oss-security] 20150821 Re: CVE request - OpenSSH 6.9 PAM privilege separation vulnerabilities",
"tags": [
"mailing-list"
],
"url": "http://www.openwall.com/lists/oss-security/2015/08/22/1"
},
{
"name": "FEDORA-2015-13469",
"tags": [
"vendor-advisory"
],
"url": "http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html"
},
{
"name": "76317",
"tags": [
"vdb-entry"
],
"url": "http://www.securityfocus.com/bid/76317"
},
{
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html"
},
{
"name": "GLSA-201512-04",
"tags": [
"vendor-advisory"
],
"url": "https://security.gentoo.org/glsa/201512-04"
},
{
"url": "https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10136"
},
{
"url": "http://www.openssh.com/txt/release-7.0"
},
{
"url": "http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html"
},
{
"url": "https://github.com/openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc66f7"
},
{
"name": "RHSA-2016:0741",
"tags": [
"vendor-advisory"
],
"url": "http://rhn.redhat.com/errata/RHSA-2016-0741.html"
},
{
"name": "20150813 BFS-SA-2015-002: OpenSSH PAM Privilege Separation Vulnerabilities",
"tags": [
"mailing-list"
],
"url": "http://seclists.org/fulldisclosure/2015/Aug/54"
},
{
"url": "http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html"
},
{
"name": "SUSE-SU-2015:1581",
"tags": [
"vendor-advisory"
],
"url": "http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html"
},
{
"name": "[debian-lts-announce] 20180910 [SECURITY] [DLA 1500-1] openssh security update",
"tags": [
"mailing-list"
],
"url": "https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html"
},
{
"url": "https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-764"
},
{
"url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"
}
]
}
},
"cveMetadata": {
"assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
"assignerShortName": "mitre",
"cveId": "CVE-2015-6564",
"datePublished": "2015-08-24T00:00:00.000Z",
"dateReserved": "2015-08-21T00:00:00.000Z",
"dateUpdated": "2026-05-27T16:18:06.617Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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