CVE-2018-1139
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.10%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.10% probability · 88th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20, CWE-522
- Affected
- samba/samba · canonical/ubuntu linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux workstation
- Source
- secalert@redhat.com
EPSS 3.1% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.