CVE-2020-8201

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering.

Exploit odds

5.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2020-09-18 21:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:26 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 5.3% in the next 30 days (EPSS).
• Severity: 7.4 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2020-09-18 21:15 UTC

Last modified

2026-06-17 03:26 UTC

Exploit probability

5.3% · EPSS, next 30 days

Weakness

CWE-444

Record status

Modified

Affected

• Nodejs node.js < 12.18.4
• Nodejs node.js < 14.11.0
• Opensuse Leap 15.2
• Fedoraproject Fedora 33

Attack profile CVSS 3.1 · 7.4

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2020-8201.md and follow it. Check whether this project is affected by CVE-2020-8201. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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