CVE-2020-17477Network attack vector

Authenticated password-hash disclosure via permissive LDAP ACLs

Published Oct 26, 2023 · Updated Sep 10, 2024

Incorrect LDAP access controls in Univention UCS@school before 4.4v5-errata allow remote authenticated users to read password hashes. The ucs-school-ldap-acls-master package grants teacher, staff, and school-administrator roles LDAP search access to sambaNTPassword, krb5Key, sambaPasswordHistory, and pwhistory attributes. A teacher account is sufficient to retrieve an NTLM hash and use it to obtain administrator access.

CVSS severity6.5
Medium
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect LDAP access controls in Univention UCS@school before 4.4v5-errata allow remote authenticated users to read password hashes. The ucs-school-ldap-acls-master package grants teacher, staff, and school-administrator roles LDAP search access to sambaNTPassword, krb5Key, sambaPasswordHistory, and pwhistory attributes. A teacher account is sufficient to retrieve an NTLM hash and use it to obtain administrator access.

The record

CVE
CVE-2020-17477
Published
Oct 26, 2023
Updated
Sep 10, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-522, T1003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-522Insufficiently Protected Credentials
T1003OS Credential Dumping

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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