CVE-2020-8265

Name: CVE-2020-8265
Creator: NVD / NIST
Published: 2021-01-06T21:15:14.41+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 9.01%

Last modified Jun 17, 2026

CVE-2020-8265 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. Node.js versions before 10.23.1, 12.20.1, 14.15.4, 15.5.1 are vulnerable to a use-after-free bug in its TLS implementation. When writing to a TLS enabled socket, node::StreamBase::Write calls node::TLSWrap::DoWrite with a freshly allocated WriteWrap object as first argument. EPSS estimates a 9.01% chance of exploitation in the next 30 days.

Description

Node.js versions before 10.23.1, 12.20.1, 14.15.4, 15.5.1 are vulnerable to a use-after-free bug in its TLS implementation. When writing to a TLS enabled socket, node::StreamBase::Write calls node::TLSWrap::DoWrite with a freshly allocated WriteWrap object as first argument. If the DoWrite method does not return an error, this object is passed back to the caller as part of a StreamWriteResult structure. This may be exploited to corrupt memory leading to a Denial of Service or potentially other exploits.

Metrics

CVSS 3.1

8.1/10

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

EPSS Probability

9.01%

94.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nodejs	Node.Js	>= 10.0.0, < 10.23.1
Nodejs	Node.Js	>= 12.0.0, < 12.20.1
Nodejs	Node.Js	>= 14.0.0, < 14.15.4
Nodejs	Node.Js	>= 15.0.0, < 15.5.1
Debian	Debian Linux	10.0
Fedoraproject	Fedora	32
Fedoraproject	Fedora	33
Oracle	Graalvm	19.3.4
Oracle	Graalvm	20.3.0
Siemens	Sinec Infrastructure Network Services	< 1.0.1.1

References

https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://hackerone.com/reports/988103Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/Patch, Vendor Advisory
https://security.gentoo.org/glsa/202101-07Third Party Advisory
https://security.netapp.com/advisory/ntap-20210212-0003/Third Party Advisory
https://www.debian.org/security/2021/dsa-4826Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfPatch, Third Party Advisory
https://hackerone.com/reports/988103Exploit, Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/Patch, Vendor Advisory
https://security.gentoo.org/glsa/202101-07Third Party Advisory
https://security.netapp.com/advisory/ntap-20210212-0003/Third Party Advisory
https://www.debian.org/security/2021/dsa-4826Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2021.htmlThird Party Advisory

Timeline

Published: Jan 6, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8265?

How severe is CVE-2020-8265?

CVE-2020-8265 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 9.01% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8265?

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-2020-8265?

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

Scan your code now

Source: NVD / NIST