What is CVE-2020-35769?

CVE-2020-35769 is a critical-severity vulnerability in Microsoft Windows. CVSS score: 9.8/10. Published 2020-12-29.

How severe is CVE-2020-35769?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Microsoft Windows

CVE-2020-35769

miniserv.pl in Webmin 1.962 on Windows mishandles special characters in query arguments to the CGI program.

Published 2020-12-29 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.018 (77.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.018 · change: +0.000

Affected products

Microsoft Windows
Webmin — versions 1.962

References

github.com/webmin/webmin/commit/1163f3a7f418f249af64890f4636575e687e9de7 (Patch, Third Party Advisory)
vigilance.fr/vulnerability/Webmin-code-execution-via-miniserv-pl-handle-request… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-35769?: CVE-2020-35769 is a critical-severity vulnerability in Microsoft Windows. CVSS score: 9.8/10. Published 2020-12-29.
How severe is CVE-2020-35769?: Critical severity. CVSS v3 base score is 9.8 out of 10.