CVE-2018-12121

Name: CVE-2018-12121
Creator: NVD / NIST
Published: 2018-11-28T17:29:00.337+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 10.21%

Last modified Jun 17, 2026

CVE-2018-12121 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 10.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

10.21%

95.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nodejs	Node.Js	>= 6.0.0, < 6.15.0
Nodejs	Node.Js	>= 8.0.0, < 8.14.0
Nodejs	Node.Js	>= 10.0.0, < 10.14.0
Nodejs	Node.Js	>= 11.0.0, < 11.3.0
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Eus	8.4
Redhat	Enterprise Linux Eus	8.6
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Aus	8.4
Redhat	Enterprise Linux Server Aus	8.6
Redhat	Enterprise Linux Server Tus	8.2
Redhat	Enterprise Linux Server Tus	8.4
Redhat	Enterprise Linux Server Tus	8.6
Redhat	Enterprise Linux Workstation	7.0

References

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

Timeline

Published: Nov 28, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-12121?

How severe is CVE-2018-12121?

CVE-2018-12121 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 10.21% probability of exploitation in the next 30 days.

How do I fix CVE-2018-12121?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-12121?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST