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Vulnerability record · CVE-2020-8201 · published 18 September 2020

CVE-2020-8201: Nodejs node.js http request smuggling vulnerability

Nodejs · Node.Js

Node.js < 12.18.4 and < 14.11 can be exploited to perform HTTP desync attacks and deliver malicious payloads to unsuspecting users. The payloads can be crafted by an attacker to hijack user sessions, poison cookies, perform clickjacking, and a multitude of other attacks depending on the architecture of the underlying system. The attack was possible due to a bug in processing of carrier-return symbols in the HTTP header names.

7.4 CVSS 3.1 High EPSS 5.3% · top 7.7% CWE-444 · HTTP request smuggling
7.4CVSS 3.1 base score, v2 5.8
5.3%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References
17 Jun 2026Last modified by NVD

Description

Node.js < 12.18.4 and < 14.11 can be exploited to perform HTTP desync attacks and deliver malicious payloads to unsuspecting users. The payloads can be crafted by an attacker to hijack user sessions, poison cookies, perform clickjacking, and a multitude of other attacks depending on the architecture of the underlying system. The attack was possible due to a bug in processing of carrier-return symbols in the HTTP header names.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00011.html Third Party Advisory
https://hackerone.com/reports/922597 Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXN
https://nodejs.org/en/blog/vulnerability/september-2020-security-releases/ Vendor Advisory
https://security.gentoo.org/glsa/202101-07 Third Party Advisory
https://security.netapp.com/advisory/ntap-20201009-0004/ Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00011.html Third Party Advisory
https://hackerone.com/reports/922597 Permissions Required
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4OOYAMJVLLCLXDTHW3V5UXN
https://nodejs.org/en/blog/vulnerability/september-2020-security-releases/ Vendor Advisory
https://security.gentoo.org/glsa/202101-07 Third Party Advisory
https://security.netapp.com/advisory/ntap-20201009-0004/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-8201), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.