What is CVE-2020-29136?

CVE-2020-29136 is a medium-severity vulnerability in Cpanel, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2020-11-27.

How severe is CVE-2020-29136?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Cpanel

CVE-2020-29136

In cPanel before 90.0.17, 2FA can be bypassed via a brute-force approach (SEC-575).

Published 2020-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (66.8th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Cpanel

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

docs.cpanel.net/changelogs/90-change-log/ (Vendor Advisory)
news.cpanel.com/cpanel-tsr-2020-0007-full-disclosure/ (Vendor Advisory)
www.digitaldefense.com/news/zero-day-cpanel-and-webhost-manager/ (Third Party Advisory)

Frequently asked questions

What is CVE-2020-29136?: CVE-2020-29136 is a medium-severity vulnerability in Cpanel, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2020-11-27.
How severe is CVE-2020-29136?: Medium severity. CVSS v3 base score is 6.5 out of 10.