CVE-2016-6210

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{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "cve@mitre.org"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openbsd:openssh:*:p2:*:*:*:*:*:*", "matchCriteriaId": "4AFA4267-E15B-4826-9B98-63F68AB1627F", "versionEndIncluding": "7.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided."}, {"lang": "es", "value": "sshd en OpenSSH en versiones anteriores a 7.3, cuando SHA256 o SHA512 son utilizados para el hashing de la contrase\u00f1a del usuario, utiliza BLOWFISH hashing en una contrase\u00f1a est\u00e1tica cuando no existe el nombre de usuario, lo que permite a atacantes remotos enumerar usuarios aprovechando la diferencia de tiempo entre respuestas cuando se proporciona una contrase\u00f1a grande."}], "id": "CVE-2016-6210", "lastModified": "2026-06-17T00:50:38.270", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "NONE", "baseScore": 4.3, "confidentialityImpact": "PARTIAL", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N", "version": "2.0"}, "exploitabilityScore": 8.6, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", 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"partial"}], "role": "CISA Coordinator", "timestamp": "2026-05-29T20:17:34.559558Z", "version": "2.0.3"}}]}, "published": "2017-02-13T17:59:00.153", "references": [{"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2016/Jul/51"}, {"source": "cve@mitre.org", "url": "http://www.debian.org/security/2016/dsa-3626"}, {"source": "cve@mitre.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/91812"}, {"source": "cve@mitre.org", "url": "http://www.securitytracker.com/id/1036319"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2017:2029"}, {"source": "cve@mitre.org", "url": "https://access.redhat.com/errata/RHSA-2017:2563"}, {"source": "cve@mitre.org", "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf"}, {"source": "cve@mitre.org", "url": "https://security.gentoo.org/glsa/201612-18"}, {"source": "cve@mitre.org", "url": "https://security.netapp.com/advisory/ntap-20190206-0001/"}, {"source": "cve@mitre.org", "url": "https://www.exploit-db.com/exploits/40113/"}, {"source": "cve@mitre.org", "url": "https://www.exploit-db.com/exploits/40136/"}, {"source": "cve@mitre.org", "tags": ["Release Notes", "Vendor Advisory"], "url": "https://www.openssh.com/txt/release-7.3"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://seclists.org/fulldisclosure/2016/Jul/51"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.debian.org/security/2016/dsa-3626"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/91812"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "http://www.securitytracker.com/id/1036319"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://access.redhat.com/errata/RHSA-2017:2029"}, {"source": 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{"affected_release": [{"advisory": "RHSA-2017:2563", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "openssh-0:5.3p1-123.el6_9", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2017-08-31T00:00:00Z"}, {"advisory": "RHSA-2017:2029", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "openssh-0:7.4p1-11.el7", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2017-08-01T00:00:00Z"}], "bugzilla": {"description": "openssh: User enumeration via covert timing channel", "id": "1357442", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1357442"}, "csaw": false, "cvss": {"cvss_base_score": "5.0", "cvss_scoring_vector": "AV:N/AC:L/Au:N/C:P/I:N/A:N", "status": "verified"}, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "verified"}, "cwe": "CWE-385", "details": ["sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.", "A covert timing channel flaw was found in the way OpenSSH handled authentication of non-existent users. A remote unauthenticated attacker could possibly use this flaw to determine valid user names by measuring the timing of server responses."], "name": "CVE-2016-6210", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "openssh", "product_name": "Red Hat Enterprise Linux 5"}], "public_date": "2016-07-14T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2016-6210\nhttps://nvd.nist.gov/vuln/detail/CVE-2016-6210"], "statement": "This issue in OpenSSH is mitigated by the usage of SELinux in Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.", "threat_severity": "Moderate"}

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