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CVE-2018-16857

Samba from version 4.9.0 and before version 4.9.3 that have AD DC configurations watching for bad passwords (to restrict brute forcing of passwords) in a window of more than 3 minutes may not watch for bad passwords at all. The primary risk from this issue is with regards to domains that have been upgraded from Samba 4.8 and earlier. In these cases the manual testing done to confirm an organisation's password policies apply as expected may not have been re-done after the upgrade.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.4, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), for affected systems. Impacting 1 product from samba organizations running these solutions should prioritize assessment and patching.

Historical Context

First disclosed in 2018, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.

Published

2018-11-28T14:29:00.610

Last Modified

2026-06-17T01:44:55.403

Status

Modified

Source

[email protected]

Severity

CVSSv3.0: 7.4 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:P/A:N

Access Vector: NETWORK
Access Complexity: MEDIUM
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: PARTIAL
Availability Impact: NONE

Exploitability Score

8.6

Impact Score

2.9

Weaknesses

Type: Secondary
CWE-358
Type: Primary
CWE-358

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	samba	samba	< 4.9.3	Yes

References

http://www.securityfocus.com/bid/106024 Third Party Advisory, VDB Entry ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16857 Issue Tracking, Mitigation, Third Party Advisory ([email protected])
https://security.gentoo.org/glsa/202003-52 ([email protected])
https://security.netapp.com/advisory/ntap-20181127-0001/ Third Party Advisory ([email protected])
https://www.samba.org/samba/security/CVE-2018-16857.html Mitigation, Patch, Vendor Advisory ([email protected])
http://www.securityfocus.com/bid/106024 Third Party Advisory, VDB Entry (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16857 Issue Tracking, Mitigation, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202003-52 (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20181127-0001/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.samba.org/samba/security/CVE-2018-16857.html Mitigation, Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For samba's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.