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Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0."}, {"lang": "es", "value": "Un cliente malicioso al que se le permite enviar grandes cantidades de tr\u00e1fico (miles de millones de paquetes) a un servidor DHCP puede terminar desbordando un contador de referencia de 32 bits, provocando el cierre inesperado de dhcpd. Afecta a ISC DHCP desde la versi\u00f3n 4.1.0 hasta la 4.1-ESV-R15, desde la versi\u00f3n 4.2.0 hasta la 4.2.8, desde la versi\u00f3n 4.3.0 hasta la 4.3.6 y a la versi\u00f3n 4.4.0."}], "id": "CVE-2018-5733", "lastModified": "2026-06-17T02:00:40.717", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV30": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.0"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Secondary"}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2019-01-16T20:29:00.753", "references": [{"source": "security-officer@isc.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/103188"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1040437"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:0469"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:0483"}, {"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/aa-01567"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3586-1/"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3586-2/"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2018/dsa-4133"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securityfocus.com/bid/103188"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory", "VDB Entry"], "url": "http://www.securitytracker.com/id/1040437"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:0469"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/errata/RHSA-2018:0483"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/aa-01567"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://security.netapp.com/advisory/ntap-20250425-0010/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3586-1/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://usn.ubuntu.com/3586-2/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://www.debian.org/security/2018/dsa-4133"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"acknowledgement": "Red Hat would like to thank ISC for reporting this issue. Upstream acknowledges Felix Wilhelm (Google) as the original reporter.", "affected_release": [{"advisory": "RHSA-2018:0469", "cpe": "cpe:/o:redhat:enterprise_linux:6", "package": "dhcp-12:4.1.1-53.P1.el6_9.3", "product_name": "Red Hat Enterprise Linux 6", "release_date": "2018-03-09T00:00:00Z"}, {"advisory": "RHSA-2018:0483", "cpe": "cpe:/o:redhat:enterprise_linux:7", "package": "dhcp-12:4.2.5-58.el7_4.3", "product_name": "Red Hat Enterprise Linux 7", "release_date": "2018-03-12T00:00:00Z"}], "bugzilla": {"description": "dhcp: Reference count overflow in dhcpd allows denial of service", "id": "1549961", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1549961"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-190", "details": ["A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.", "A denial of service flaw was found in the way dhcpd handled reference counting when processing client requests. A malicious DHCP client could use this flaw to trigger a reference count overflow on the server side, potentially causing dhcpd to crash, by sending large amounts of traffic."], "name": "CVE-2018-5733", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:5", "fix_state": "Will not fix", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 5"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 8"}], "public_date": "2018-02-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2018-5733\nhttps://nvd.nist.gov/vuln/detail/CVE-2018-5733\nhttps://kb.isc.org/article/AA-01567"], "threat_severity": "Moderate"}

{}