Is CVE-2018-12121 being actively exploited?

CVE-2018-12121 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2018-12121?

CVE-2018-12121 has a CVSS 3.1 base score of 7.5 (HIGH).

CVE-2018-12121

HIGH · CVSS 7.5EPSS 10.2%EU EUVD

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.

Key facts

CVSS score: 7.5 (v3.1)
Severity: HIGH
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
EPSS score: 10.2% (96th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2018-4099)
Published: November 28, 2018
NVD last modified: October 8, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2018-4099 in the EU Vulnerability Database. Last updated in EUVD on October 8, 2026.

View on the EU Vulnerability Database

Affected products

nodejs / node.js
nodejs / node.js
redhat / enterprise linux
redhat / enterprise linux desktop
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux eus
redhat / enterprise linux server
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server aus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux server tus
redhat / enterprise linux workstation

Certified products that may be affected

26 FIPS 140 or Common Criteria certified products, from automated matching by sec-certs.org.

Red Hat Enterprise Linux 8 NSS Cryptographic Module - Red Hat, Inc. - FIPS 140 5513 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, LLC - FIPS 140 5461 - active
Red Hat Enterprise Linux 8 Kernel Cryptographic API - Red Hat, Inc. - FIPS 140 5089 - active
Red Hat Enterprise Linux 8.6 - Red Hat, Inc. - Common Criteria CCEVS-VR-VID-11309-2024 - archived
Red Hat Enterprise Linux 8 OpenSSL Cryptographic Module - Red Hat®, Inc. - FIPS 140 4642 - historical

See all 26 in the Security Certifications Explorer.

References

http://www.securityfocus.com/bid/106043(Third Party Advisory, VDB Entry)
https://access.redhat.com/errata/RHSA-2019:1821(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:2258(Third Party Advisory)
https://access.redhat.com/errata/RHSA-2019:3497(Third Party Advisory)
https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/(Patch, Vendor Advisory)
https://security.gentoo.org/glsa/202003-48(Third Party Advisory)
https://security.netapp.com/advisory/ntap-20241227-0008/

Last updated October 10, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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