CVE-2018-1139

Name: CVE-2018-1139
Creator: NVD / NIST
Published: 2018-08-22T14:29:00.363+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.1/10EPSS 3.10%

Last modified Jun 17, 2026

CVE-2018-1139 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.. EPSS estimates a 3.10% chance of exploitation in the next 30 days.

Description

A flaw was found in the way samba before 4.7.9 and 4.8.4 allowed the use of weak NTLMv1 authentication even when NTLMv1 was explicitly disabled. A man-in-the-middle attacker could use this flaw to read the credential and other details passed between the samba server and client.

Metrics

CVSS 3.1

8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.10%

86.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Samba	Samba	>= 4.7.0, < 4.7.9
Samba	Samba	>= 4.8.0, < 4.8.4
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	16.04
Canonical	Ubuntu Linux	18.04
Redhat	Enterprise Linux Desktop	7.0
Redhat	Enterprise Linux Server	7.0
Redhat	Enterprise Linux Workstation	7.0

References

http://www.securityfocus.com/bid/105084Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2612Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2613Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3056Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202003-52Third Party Advisory
https://security.netapp.com/advisory/ntap-20180814-0001/Third Party Advisory
https://usn.ubuntu.com/3738-1/Third Party Advisory
https://www.samba.org/samba/security/CVE-2018-1139.htmlThird Party Advisory
http://www.securityfocus.com/bid/105084Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2018:2612Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2613Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:3056Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1139Issue Tracking, Third Party Advisory
https://security.gentoo.org/glsa/202003-52Third Party Advisory
https://security.netapp.com/advisory/ntap-20180814-0001/Third Party Advisory
https://usn.ubuntu.com/3738-1/Third Party Advisory
https://www.samba.org/samba/security/CVE-2018-1139.htmlThird Party Advisory

Timeline

Published: Aug 22, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-1139?

How severe is CVE-2018-1139?

CVE-2018-1139 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 3.10% probability of exploitation in the next 30 days.

How do I fix CVE-2018-1139?

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-2018-1139?

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

Scan your code now

Source: NVD / NIST