What is CVE-2020-26301?

CVE-2020-26301 is a high-severity vulnerability in Microsoft Windows, classified under OS Command Injection. CVSS score: 7.5/10. Published 2021-09-20.

How severe is CVE-2020-26301?

High severity. CVSS v3 base score is 7.5 out of 10.

RCE in Microsoft Windows

CVE-2020-26301

ssh2 is client and server modules written in pure JavaScript for node.js. In ssh2 before version 1.4.0 there is a command injection vulnerability. The issue only exists on Windows. This issue may lead to remote code execution if a client of the library calls the vulnerable method with untrusted input. This is fixed in version 1.4.0.

Vulnerability class: Command Injection (OS Command Injection)

Published 2021-09-20 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.038 (89.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-78 — OS Command Injection

References

github.com/mscdex/ssh2/commit/f763271f41320e71d5cbee02ea5bc6a2ded3ca21 (Patch, Third Party Advisory)
securitylab.github.com/advisories/GHSL-2020-123-mscdex-ssh2/ (Exploit, Patch, Third Party Advisory)
www.npmjs.com/package/ssh2 (Product, Third Party Advisory)

Frequently asked questions

What is CVE-2020-26301?: CVE-2020-26301 is a high-severity vulnerability in Microsoft Windows, classified under OS Command Injection. CVSS score: 7.5/10. Published 2021-09-20.
How severe is CVE-2020-26301?: High severity. CVSS v3 base score is 7.5 out of 10.