CVE-2020-17477

Name: CVE-2020-17477
Creator: NVD / NIST
Published: 2023-10-26T13:15:09.293+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.38%

Last modified Jun 17, 2026

CVE-2020-17477 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Incorrect LDAP ACLs in ucs-school-ldap-acls-master in UCS@school before 4.4v5-errata allow remote teachers, staff, and school administrators to read LDAP password hashes (sambaNTPassword, krb5Key, sambaPasswordHistory, and pwhistory) via LDAP search requests. For example, a teacher can gain administrator access via an NTLM hash.. EPSS estimates a 0.38% chance of exploitation in the next 30 days.

Description

Incorrect LDAP ACLs in ucs-school-ldap-acls-master in UCS@school before 4.4v5-errata allow remote teachers, staff, and school administrators to read LDAP password hashes (sambaNTPassword, krb5Key, sambaPasswordHistory, and pwhistory) via LDAP search requests. For example, a teacher can gain administrator access via an NTLM hash.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.38%

29.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-522

Affected Software

Vendor	Product	Versions
Univention	Ucs\@School	<= 4.4

References

https://forge.univention.org/bugzilla/show_bug.cgi?id=50669Issue Tracking, Third Party Advisory
https://forge.univention.org/bugzilla/show_bug.cgi?id=50669Issue Tracking, Third Party Advisory

Timeline

Published: Oct 26, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-17477?

How severe is CVE-2020-17477?

CVE-2020-17477 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.38% probability of exploitation in the next 30 days.

How do I fix CVE-2020-17477?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-17477?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST