{"api_version":"1","generated_at":"2026-07-23T11:19:44+00:00","cve":"CVE-2019-8460","urls":{"html":"https://cve.report/CVE-2019-8460","api":"https://cve.report/api/cve/CVE-2019-8460.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2019-8460","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2019-8460"},"summary":{"title":"CVE-2019-8460","description":"OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.","state":"PUBLIC","assigner":"cve@checkpoint.com","published_at":"2019-08-26 20:15:00","updated_at":"2021-08-02 17:15:00"},"problem_types":["NVD-CWE-Other"],"metrics":[],"references":[{"url":"https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/","name":"https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/","refsource":"MISC","tags":["Exploit","Patch","Press/Media Coverage","Third Party Advisory"],"title":"TCP SACK Security Issue in OpenBSD - CVE-2019-8460 - Check Point Research","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03","name":"https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03","refsource":"MISC","tags":[],"title":"Siemens Industrial Products (Update G) | CISA","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://security.netapp.com/advisory/ntap-20190905-0001/","name":"https://security.netapp.com/advisory/ntap-20190905-0001/","refsource":"CONFIRM","tags":["Third Party Advisory"],"title":"CVE-2019-8460 OpenBSD Vulnerability in NetApp Products | NetApp Product Security","mime":"text/html","httpstatus":"200","archivestatus":"0"},{"url":"https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig","name":"https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig","refsource":"MISC","tags":["Exploit","Vendor Advisory"],"title":"","mime":"text/x-diff","httpstatus":"200","archivestatus":"200"},{"url":"https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f","name":"https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f","refsource":"MISC","tags":["Patch","Third Party Advisory"],"title":"Received SACK options are managed by a linked list at the TCP socket. · openbsd/src@ed8fdce · GitHub","mime":"text/html","httpstatus":"200","archivestatus":"200"},{"url":"https://www.cve.org/CVERecord?id=CVE-2019-8460","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2019-8460","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[{"cve_year":"2019","cve_id":"8460","vulnerable":"1","versionEndIncluding":"6.5","cpe1":"cpe","cpe2":"2.3","cpe3":"o","cpe4":"openbsd","cpe5":"openbsd","cpe6":"*","cpe7":"*","cpe8":"*","cpe9":"*","cpe10":"*","cpe11":"*","cpe12":"*","cpe13":"*"}],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"data_type":"CVE","data_format":"MITRE","data_version":"4.0","CVE_data_meta":{"ID":"CVE-2019-8460","ASSIGNER":"cve@checkpoint.com","STATE":"PUBLIC"},"affects":{"vendor":{"vendor_data":[{"vendor_name":"n/a","product":{"product_data":[{"product_name":"OpenBSD","version":{"version_data":[{"version_value":"All, including latest - 6.5"}]}}]}}]}},"problemtype":{"problemtype_data":[{"description":[{"lang":"eng","value":"CWE-1049"}]}]},"references":{"reference_data":[{"refsource":"MISC","name":"https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f","url":"https://github.com/openbsd/src/commit/ed8fdce754a5d8d14c09e989d8877707bd43906f"},{"refsource":"MISC","name":"https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig","url":"https://ftp.openbsd.org/pub/OpenBSD/patches/6.5/common/006_tcpsack.patch.sig"},{"refsource":"CONFIRM","name":"https://security.netapp.com/advisory/ntap-20190905-0001/","url":"https://security.netapp.com/advisory/ntap-20190905-0001/"},{"refsource":"MISC","name":"https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/","url":"https://research.checkpoint.com/tcp-sack-security-issue-in-openbsd-cve-2019-8460/"},{"refsource":"MISC","name":"https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03","url":"https://us-cert.cisa.gov/ics/advisories/icsa-19-253-03"}]},"description":{"description_data":[{"lang":"eng","value":"OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service."}]}},"nvd":{"publishedDate":"2019-08-26 20:15:00","lastModifiedDate":"2021-08-02 17:15:00","problem_types":["NVD-CWE-Other"],"metrics":{"baseMetricV3":{"cvssV3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6},"baseMetricV2":{"cvssV2":{"version":"2.0","vectorString":"AV:N/AC:L/Au:N/C:N/I:N/A:P","accessVector":"NETWORK","accessComplexity":"LOW","authentication":"NONE","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"PARTIAL","baseScore":5},"severity":"MEDIUM","exploitabilityScore":10,"impactScore":2.9,"acInsufInfo":false,"obtainAllPrivilege":false,"obtainUserPrivilege":false,"obtainOtherPrivilege":false,"userInteractionRequired":false}},"configurations":{"CVE_data_version":"4.0","nodes":[{"operator":"OR","children":[],"cpe_match":[{"vulnerable":true,"cpe23Uri":"cpe:2.3:o:openbsd:openbsd:*:*:*:*:*:*:*:*","versionEndIncluding":"6.5","cpe_name":[]}]}]}},"legacy_mitre":{"record":{"CveYear":"2019","CveId":"8460","Ordinal":"146296","Title":"CVE-2019-8460","CVE":"CVE-2019-8460","Year":"2019"},"notes":[{"CveYear":"2019","CveId":"8460","Ordinal":"1","NoteData":"OpenBSD kernel version <= 6.5 can be forced to create long chains of TCP SACK holes that causes very expensive calls to tcp_sack_option() for every incoming SACK packet which can lead to a denial of service.","Type":"Description","Title":null},{"CveYear":"2019","CveId":"8460","Ordinal":"2","NoteData":"2019-08-26","Type":"Other","Title":"Published"},{"CveYear":"2019","CveId":"8460","Ordinal":"3","NoteData":"2021-08-02","Type":"Other","Title":"Modified"}]}}}