{"id":"CVE-2018-12121","url":"https://www.cyber-defence.io/tools/cve/CVE-2018-12121","generatedAt":"2026-10-28T20:26:18.495Z","title":"Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the…","description":"Node.js: All versions prior to Node.js 6.15.0, 8.14.0, 10.14.0 and 11.3.0: Denial of Service with large HTTP headers: By using a combination of many requests with maximum sized headers (almost 80 KB per connection), and carefully timed completion of the headers, it is possible to cause the HTTP server to abort from heap allocation failure. Attack potential is mitigated by the use of a load balancer or other proxy layer.","published":"2018-11-28T17:29:00.000Z","lastModified":"2026-10-08T22:16:45.000Z","status":"Modified","sourceIdentifier":"cve-request@iojs.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-400"],"affected":["nodejs/node.js","redhat/enterprise linux","redhat/enterprise linux desktop","redhat/enterprise linux eus","redhat/enterprise linux server","redhat/enterprise linux server aus","redhat/enterprise linux server tus","redhat/enterprise linux workstation"],"epss":{"score":0.10207,"percentile":0.95646,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 10.2%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/106043","tags":["Third Party Advisory","VDB Entry"],"source":"cve-request@iojs.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:1821","tags":["Third Party Advisory"],"source":"cve-request@iojs.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:2258","tags":["Third Party Advisory"],"source":"cve-request@iojs.org"},{"url":"https://access.redhat.com/errata/RHSA-2019:3497","tags":["Third Party Advisory"],"source":"cve-request@iojs.org"},{"url":"https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/","tags":["Patch","Vendor Advisory"],"source":"cve-request@iojs.org"},{"url":"https://security.gentoo.org/glsa/202003-48","tags":["Third Party Advisory"],"source":"cve-request@iojs.org"},{"url":"http://www.securityfocus.com/bid/106043","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:1821","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:2258","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://access.redhat.com/errata/RHSA-2019:3497","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.gentoo.org/glsa/202003-48","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20241227-0008/","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2018-12121","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}