CVE•Published 2018-11-28•Modified 2026-10-08•1 article on news•5 live references•NVD data
CVE-2018-12121Nodejs · Node.js
Vulnerability data via NVD (ingested)
CVSS v3.1
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS percentile
96
Exploit Prediction Scoring System · top 4% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2018-11-28
Modified 2026-10-08
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2018-12121Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Nodejs Node.js"All exposed Nodejs Node.js instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Node.js"HTTP body or banner mentions "Node.js" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2018-12121Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2018-12121Censys host search filtered to this CVE id.
grep.app
CVE-2018-12121Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2018-12121GitHub code search for direct mentions.
Google dork
"CVE-2018-12121" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2018-12121 on GitHub.