What’s Vulnerable › Vulnerabilities

CVE-2020-17477

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-10-26 · updated 2026-06-17
• Weakness: CWE-522

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.

Affected products

• Univention Ucs@School: through 4.4

References

• https://forge.univention.org/bugzilla/show_bug.cgi?id=50669
• https://forge.univention.org/bugzilla/show_bug.cgi?id=50669

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