CVE-2015-5600 (GCVE-0-2015-5600)
Vulnerability from cvelistv5 – Published: 2015-08-03 00:00 – Updated: 2026-05-27 16:31
VLAI
EPSS
VEX
Summary
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
Severity
8.1 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-27 16:31 UTC
CWE
- n/a
- CWE-400 - Uncontrolled Resource Consumption
Assigner
References
33 references
Date Public
2015-07-17 00:00
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"sourceIdentifier": "cve@mitre.org",
"vulnStatus": "Modified",
"weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-264\"}]}]"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2015-5600\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2015-08-03T01:59:03.950\",\"lastModified\":\"2026-05-27T18:16:20.367\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.\"},{\"lang\":\"es\",\"value\":\"Vulnerabilidad en la funci\u00f3n kbdint_next_device en auth2-chall.c en sshd en OpenSSH hasta la versi\u00f3n 6.9, no restringe correctamente el procesamiento de dispositivos de teclado interactivo con una \u00fanica conexi\u00f3n, lo cual facilita a atacantes remotos ejecutar un ataque de fuerza bruta o causar una denegaci\u00f3n de servicio (mediante el consumo de la CPU) a trav\u00e9s de una lista larga y redundante en la opci\u00f3n ssh -oKbdInteractiveDevices, seg\u00fan lo demostrado por una modificaci\u00f3n en el cliente que provee una contrase\u00f1a diferente para cada uno de los elementos pam de la lista.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"HIGH\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.2,\"impactScore\":5.9}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:P/I:N/A:C\",\"baseScore\":8.5,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"COMPLETE\"},\"baseSeverity\":\"HIGH\",\"exploitabilityScore\":10.0,\"impactScore\":7.8,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-264\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*\",\"versionEndIncluding\":\"6.9\",\"matchCriteriaId\":\"27C9A807-7740-4D75-9B01-91ED53D14C40\"}]}]}],\"references\":[{\"url\":\"http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/auth2-chall.c.diff?r1=1.42\u0026r2=1.43\u0026f=h\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://kb.juniper.net/InfoCenter/index?page=content\u0026id=JSA10697\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.apple.com/archives/security-announce/2015/Aug/msg00001.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.fedoraproject.org/pipermail/package-announce/2015-July/162955.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://openwall.com/lists/oss-security/2015/07/23/4\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://rhn.redhat.com/errata/RHSA-2016-0466.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://seclists.org/fulldisclosure/2015/Jul/92\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\"]},{\"url\":\"http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.oracle.com/technetwork/topics/security/ovmbulletinjul2016-3090546.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securityfocus.com/bid/75990\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securityfocus.com/bid/91787\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securityfocus.com/bid/92012\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.securitytracker.com/id/1032988\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.ubuntu.com/usn/USN-2710-1\",\"source\":\"cve@mitre.org\"},{\"url\":\"http://www.ubuntu.com/usn/USN-2710-2\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04952480\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05128992\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05157667\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10136\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://kc.mcafee.com/corporate/index?page=content\u0026id=SB10157\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://security.gentoo.org/glsa/201512-04\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2025-11-21T12:16:44+00:00",
"cve": "CVE-2015-5600",
"id": "CVE-2015-5600",
"initial_release_date": "2015-07-16T00:00:00+00:00",
"product_status:fixed": "680",
"product_status:known_affected": "2",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "openssh: MaxAuthTries limit bypass via duplicates in KbdInteractiveDevices",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2015/cve-2015-5600.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "important",
"current_release_date": "2026-09-05T23:57:58Z",
"cve": "CVE-2015-5600",
"id": "CVE-2015-5600",
"initial_release_date": "2023-02-15T05:15:42Z",
"product_status:known_affected": "2",
"product_status:recommended": "98",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2015-5600",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2015-5600.json",
"version": "28"
},
"vulnrichment": {
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{\"url\": \"http://www.oracle.com/technetwork/topics/security/bulletinoct2015-2511968.html\"}, {\"url\": \"https://www.arista.com/en/support/advisories-notices/security-advisories/1174-security-advisory-12\"}, {\"url\": \"https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": 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"cveMetadata": "{\"cveId\": \"CVE-2015-5600\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-27T16:31:51.246Z\", \"dateReserved\": \"2015-07-20T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2015-08-03T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
"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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