CVE-2018-16857

Name: CVE-2018-16857
Creator: NVD / NIST
Published: 2018-11-28T14:29:00.61+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.30%

Last modified Jun 17, 2026

CVE-2018-16857 is a vulnerability of currently unknown severity. 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. EPSS estimates a 2.30% chance of exploitation in the next 30 days.

Description

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.

Metrics

EPSS Probability

2.30%

81.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.9.0, < 4.9.3

References

http://www.securityfocus.com/bid/106024Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16857Issue Tracking, Mitigation, Third Party Advisory
https://security.gentoo.org/glsa/202003-52
https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
https://www.samba.org/samba/security/CVE-2018-16857.htmlMitigation, Patch, Vendor Advisory
http://www.securityfocus.com/bid/106024Third Party Advisory, VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16857Issue Tracking, Mitigation, Third Party Advisory
https://security.gentoo.org/glsa/202003-52
https://security.netapp.com/advisory/ntap-20181127-0001/Third Party Advisory
https://www.samba.org/samba/security/CVE-2018-16857.htmlMitigation, Patch, Vendor Advisory

Timeline

Published: Nov 28, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-16857?

How severe is CVE-2018-16857?

Severity scoring for CVE-2018-16857 is pending analysis. The EPSS model estimates a 2.30% probability of exploitation in the next 30 days.

How do I fix CVE-2018-16857?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-16857?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST