What is CVE-2020-1778?

CVE-2020-1778 is a medium-severity vulnerability in Otrs, classified under Improper Authentication. CVSS score: 4.1/10. Published 2020-11-23.

How severe is CVE-2020-1778?

Medium severity. CVSS v3 base score is 4.1 out of 10.

Auth bypass in Otrs

CVE-2020-1778

When OTRS uses multiple backends for user authentication (with LDAP), agents are able to login even if the account is set to invalid. This issue affects OTRS; 8.0.9 and prior versions.

Vulnerability class: Broken Authentication

Published 2020-11-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.1 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (49.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Otrs
Otrs Ag — versions 8.0.x

Weakness classification (CWE)

CWE-287 — Improper Authentication

References

otrs.com/release-notes/otrs-security-advisory-2020-16/ (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2020-1778?: CVE-2020-1778 is a medium-severity vulnerability in Otrs, classified under Improper Authentication. CVSS score: 4.1/10. Published 2020-11-23.
How severe is CVE-2020-1778?: Medium severity. CVSS v3 base score is 4.1 out of 10.