CVE-2017-7551

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks...

9.8 CriticalFix available

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.42%Up 0.8 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: CVE-2017-7551
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:P/I:N/A:N
Weakness: CWE-209, CWE-640
Updated: 2026-11-02

CVE List No score

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: CVE-2017-7551
Weakness: CWE-209
Updated: 2026-11-02

EUVDEUVD-2017-16559 No score

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: EUVD-2017-16559
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rr4q-qmwm-h86v 9.8

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks...

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: GHSA-rr4q-qmwm-h86v
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-209, CWE-640
Updated: 2026-11-02

OSV 9.8

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: CVE-2017-7551
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-7551 9.8

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: DEBIAN-CVE-2017-7551
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVRHSA-2017:2569 5.3

Red Hat Security Advisory: 389-ds-base security and bug fix update

Record: RHSA-2017:2569
CVSS 3.0: 5.3 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-7551 9.8

389-ds-base version before 1.3.5.19 and 1.3.6.7 are vulnerable to password brute-force attacks during account lockout due to different return codes returned on password attempts.

Record: UBUNTU-CVE-2017-7551
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2017-0340 No score

Updated 389-ds-base packages fix security vulnerability

The directory server password lockout policy prevents binds from operating once a threshold of failed passwords has been met. During this lockout, if you bind with a successful password, a different error code is returned. This means that an attacker has no ratelimit or penalty during an account lock, and can continue to attempt passwords via bruteforce, using the change in return code to ascertain a sucessful password auth (CVE-2017-7551).

Record: MGASA-2017-0340
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`389-ds-base` Debian:12	before 1.3.6.7-1	1.3.6.7-1
`389-ds-base` Debian:13	before 1.3.6.7-1	1.3.6.7-1
`389-ds-base` Mageia:5	before 1.3.4.14-1.3.mga5	1.3.4.14-1.3.mga5
`389-ds-base` Mageia:6	before 1.3.5.17-1.1.mga6	1.3.5.17-1.1.mga6
`389-ds-base` Red Hat:enterprise_linux:7::client	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::client	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-devel` Red Hat:enterprise_linux:7::client	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-libs` Red Hat:enterprise_linux:7::client	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-snmp` Red Hat:enterprise_linux:7::client	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base` Red Hat:enterprise_linux:7::computenode	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4

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Affected packages
Package	Affected	Fixed
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::computenode	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-devel` Red Hat:enterprise_linux:7::computenode	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-libs` Red Hat:enterprise_linux:7::computenode	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-snmp` Red Hat:enterprise_linux:7::computenode	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base` Red Hat:enterprise_linux:7::server	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::server	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-libs` Red Hat:enterprise_linux:7::server	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-devel` Red Hat:enterprise_linux:7::server	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-snmp` Red Hat:enterprise_linux:7::server	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base` Red Hat:enterprise_linux:7::workstation	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-debuginfo` Red Hat:enterprise_linux:7::workstation	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-libs` Red Hat:enterprise_linux:7::workstation	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-devel` Red Hat:enterprise_linux:7::workstation	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base-snmp` Red Hat:enterprise_linux:7::workstation	before 0:1.3.6.1-19.el7_4	0:1.3.6.1-19.el7_4
`389-ds-base` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.3.3.12-1build11.3.3.13-11.3.4.5-21.3.4.8-11.3.4.8-3 Show 4 moreShow less 1.3.4.8-3ubuntu11.3.4.8-41.3.4.9-11.3.4.9-1ubuntu0.1~esm1	None known
`389-ds-base` Ubuntu:26.04:LTS	All versions, plus listed versions 3.1.2+dfsg1-13.1.2+vendor1-2	None known

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-7551 is a critical vulnerability (CVSS 9.8) in 389 Directory Server 389-ds-base, published August 16, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.42%, the 72nd percentile. Fixed in 389-ds-base 1.3.6.7-1.

References

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