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Fencer Intel
medium 5.3

CVE-2020-35518 json

When binding against a DN during authentication, the reply from 389-ds-base will be different whether the DN exists or not.

published 5y ago modified 4mo ago also EUVD-2020-23185

cvss
5.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

When binding against a DN during authentication, the reply from 389-ds-base will be different whether the DN exists or not. This can be used by an unauthenticated attacker to check the existence of an entry in the LDAP database.

Patch / fix

  • redhat 389_directory_server 1.4.3.19, 1.4.4.13, 2.0.3
  • 389-ds-base Debian 13, Debian 12 1.4.4.10-1

debian advisories DEBIAN-CVE-2020-35518

  • 389-ds-base Ubuntu Pro 20.04 LTS 1.4.3.6-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2020-35518

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • 389-ds-base RHEL 7 1.3.10.2-12.el7_9
  • 389-ds-base-libs RHEL 7 1.3.10.2-12.el7_9
  • 389-ds-base-snmp RHEL 7 1.3.10.2-12.el7_9
  • 389-ds-base directory server 11.2 1.4.3.21-3.module+el8dsrv+10401+3d549418
  • cockpit-389-ds directory server 11.2 1.4.3.21-3.module+el8dsrv+10401+3d549418
  • python3-lib389 directory server 11.2 1.4.3.21-3.module+el8dsrv+10401+3d549418
  • 389-ds-base-libs directory server 11.2 1.4.3.21-3.module+el8dsrv+10401+3d549418
  • 389-ds-base-snmp directory server 11.2 1.4.3.21-3.module+el8dsrv+10401+3d549418

red hat advisories RHSA-2021:2323RHSA-2021:1258RHSA-2021:1243RHSA-2021:1086RHSA-2021:0599

  • 389-ds SLE Module for Server Applications 15 SP2 1.4.3.19~git0.bef0b5bed-3.12.1

suse advisories SUSE-SU-2021:0724-1

  • 389-ds openSUSE Leap 15.2 1.4.3.19~git0.bef0b5bed-lp152.2.12.1

opensuse advisories openSUSE-SU-2021:0418-1

  • 389-ds-base Arch Linux 2.0.2-1

arch linux advisories AVG-1482

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-35518 updated cvss 5.3

389-ds-base: information disclosure during the binding of a DN

  • Red Hat Enterprise Linux 6 389-ds-base, 389-ds-base-libs
    affected: no fix planned “Out of support scope”
  • Red Hat Directory Server 11.1 for RHEL 8 389-ds-base 1.4.2.12-5.module+el8dsrv+9896+eb95346c, cockpit-389-ds 1.4.2.12-5.module+el8dsrv+9896+eb95346c, python3-lib389 1.4.2.12-5.module+el8dsrv+9896+eb95346c, 389-ds-base-libs 1.4.2.12-5.module+el8dsrv+9896+eb95346c, 389-ds-base-snmp 1.4.2.12-5.module+el8dsrv+9896+eb95346c, 389-ds-base-legacy-tools 1.4.2.12-5.module+el8dsrv+9896+eb95346c
    fixed: vendor fix RHSA-2021:0599
  • Red Hat Directory Server 11.2 for RHEL 8 389-ds-base 1.4.3.21-3.module+el8dsrv+10401+3d549418, cockpit-389-ds 1.4.3.21-3.module+el8dsrv+10401+3d549418, python3-lib389 1.4.3.21-3.module+el8dsrv+10401+3d549418, 389-ds-base-libs 1.4.3.21-3.module+el8dsrv+10401+3d549418, 389-ds-base-snmp 1.4.3.21-3.module+el8dsrv+10401+3d549418, 389-ds-base-legacy-tools 1.4.3.21-3.module+el8dsrv+10401+3d549418
    fixed: vendor fix RHSA-2021:1243
  • Red Hat Enterprise Linux AppStream (v. 8) 389-ds-base 1.4.3.8-7.module+el8.3.0+10310+6e88d919, python3-lib389 1.4.3.8-7.module+el8.3.0+10310+6e88d919, 389-ds-base-libs 1.4.3.8-7.module+el8.3.0+10310+6e88d919, 389-ds-base-snmp 1.4.3.8-7.module+el8.3.0+10310+6e88d919, 389-ds-base-legacy-tools 1.4.3.8-7.module+el8.3.0+10310+6e88d919
    fixed: vendor fix RHSA-2021:1086
  • Red Hat Enterprise Linux AppStream EUS (v. 8.2) 389-ds-base 1.4.2.4-13.module+el8.2.0+10648+abe88955, python3-lib389 1.4.2.4-13.module+el8.2.0+10648+abe88955, 389-ds-base-libs 1.4.2.4-13.module+el8.2.0+10648+abe88955, 389-ds-base-snmp 1.4.2.4-13.module+el8.2.0+10648+abe88955, 389-ds-base-legacy-tools 1.4.2.4-13.module+el8.2.0+10648+abe88955
    fixed: vendor fix RHSA-2021:1258
  • Red Hat Enterprise Linux Client Optional (v. 7) 389-ds-base 1.3.10.2-12.el7_9, 389-ds-base-libs 1.3.10.2-12.el7_9, 389-ds-base-snmp 1.3.10.2-12.el7_9 Red Hat Enterprise Linux ComputeNode Optional (v. 7) 389-ds-base 1.3.10.2-12.el7_9, 389-ds-base-libs 1.3.10.2-12.el7_9, 389-ds-base-snmp 1.3.10.2-12.el7_9 Red Hat Enterprise Linux Server (v. 7) 389-ds-base 1.3.10.2-12.el7_9, 389-ds-base-libs 1.3.10.2-12.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) 389-ds-base 1.3.10.2-12.el7_9, 389-ds-base-libs 1.3.10.2-12.el7_9, 389-ds-base-snmp 1.3.10.2-12.el7_9 Red Hat Enterprise Linux Workstation (v. 7) 389-ds-base 1.3.10.2-12.el7_9, 389-ds-base-libs 1.3.10.2-12.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) 389-ds-base-snmp 1.3.10.2-12.el7_9
    fixed: vendor fix RHSA-2021:2323
  • Red Hat Enterprise Linux 9 389-ds-base, python3-lib389, 389-ds-base-libs, 389-ds-base-snmp
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Affected products

  • n/a 389-ds-base

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-203 Observable Discrepancy

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.