CVE-2018-21270

Name: CVE-2018-21270
Creator: NVD / NIST
Published: 2020-12-03T21:15:11.1+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 3.64%

Last modified Jun 17, 2026

CVE-2018-21270 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Versions less than 0.0.6 of the Node.js stringstream module are vulnerable to an out-of-bounds read because of allocation of uninitialized buffers when a number is passed in the input stream (when using Node.js 4.x).. EPSS estimates a 3.64% chance of exploitation in the next 30 days.

Description

Versions less than 0.0.6 of the Node.js stringstream module are vulnerable to an out-of-bounds read because of allocation of uninitialized buffers when a number is passed in the input stream (when using Node.js 4.x).

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

3.64%

88.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Nodejs	Node.Js	< 0.0.6

References

https://github.com/mhart/StringStream/issues/7Issue Tracking, Third Party Advisory
https://hackerone.com/reports/321670Exploit, Third Party Advisory
https://www.npmjs.com/advisories/664Exploit, Third Party Advisory
https://github.com/mhart/StringStream/issues/7Issue Tracking, Third Party Advisory
https://hackerone.com/reports/321670Exploit, Third Party Advisory
https://www.npmjs.com/advisories/664Exploit, Third Party Advisory

Timeline

Published: Dec 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-21270?

How severe is CVE-2018-21270?

CVE-2018-21270 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 3.64% probability of exploitation in the next 30 days.

How do I fix CVE-2018-21270?

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-2018-21270?

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

Scan your code now

Source: NVD / NIST