CVE-2018-16857

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of data exposure, data tampering.

Exploit odds

2.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2018-11-28 14:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 01:44 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.3% in the next 30 days (EPSS).
• Severity: 7.4 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2018-11-28 14:29 UTC

Last modified

2026-06-17 01:44 UTC

Exploit probability

2.3% · EPSS, next 30 days

Weakness

CWE-358

Record status

Modified

Affected

• Samba < 4.9.3

Attack profile CVSS 3.0 · 7.4

Attack vector

Network

Complexity

High

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2018-16857.md and follow it. Check whether this project is affected by CVE-2018-16857. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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