samba: samba AD DC LDAP denial of service via dirsync
Published Nov 6, 2019
4.9
MEDIUMCVSS 3.1
EPSS 2.11%
Description
A flaw was found in samba 4.0.0 before samba 4.9.15 and samba 4.10.x before 4.10.10. An attacker can crash AD DC LDAP server via dirsync resulting in denial of service. Privilege escalation is not possible with this issue.
Affected products
-
- Version samba 4.0.0 before samba 4.9.15, samba 4.10.x before 4.10.10StatusaffectedConstraints-
- Version
Configuration 1
Configuration 2
- 29
- 30
- 15.0
No data.
Red Hat Enterprise Linux 5
samba
Not affected
Red Hat Enterprise Linux 5
samba3x
Not affected
Red Hat Enterprise Linux 6
samba
Not affected
Red Hat Enterprise Linux 6
samba4
Not affected
Red Hat Enterprise Linux 7
samba
Not affected
Red Hat Enterprise Linux 8
samba
Not affected
Red Hat Storage 3
samba
Not affected
Red Hat Virtualization 4
redhat-virtualization-host
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 5 | samba3x | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 6 | samba4 | Not affected | n/a |
| Red Hat Enterprise Linux 7 | samba | Not affected | n/a |
| Red Hat Enterprise Linux 8 | samba | Not affected | n/a |
| Red Hat Storage 3 | samba | Not affected | n/a |
| Red Hat Virtualization 4 | redhat-virtualization-host | Not affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
This flaw does not affect the version of samba shipped with Red Hat Enterprise Linux because there is no support for samba as Active Directory Domain Controller.
Red Hat mitigation
By default, the supported versions of Samba impacted by this issue run using the "standard" process model, which is unaffected. This is controlled by the -M or --model parameter to the samba binary. Unsupported Samba versions before Samba 4.7 use a single process for the LDAP server, and so are impacted. Samba 4.8, 4.9, and 4.10 are impacted if -M prefork or -M single is used. To mitigate this issue, select -M standard (the default).
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
AV:N/AC:L/Au:S/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (20 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 2.11% (0.02114) | 81.16th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.35% (0.02355) | 81.46th | v5 (v2026.06.15) |
| Nov 21, 2025 | 2.56% (0.02561) | 85.01th | v4 (v2025.03.14) |
| Nov 18, 2025 | 4.83% (0.04828) | 88.44th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.56% (0.02561) | 84.49th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.48% (0.00484) | 76.77th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.34% (0.00341) | 70.67th | v3 (v2023.03.01) |
| Sep 27, 2023 | 0.34% (0.00341) | 68.05th | v3 (v2023.03.01) |
| Sep 15, 2023 | 0.36% (0.00355) | 68.67th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.30% (0.00296) | 64.45th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.03% (0.01034) | 41.69th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.03% (0.01034) | 37.91th | v2 (v2022.01.01) |
| Feb 4, 2022 | 14.00% (0.14004) | 90.93th | v2 (v2022.01.01) |
| Feb 3, 2022 | 8.63% (0.08626) | 85.56th | v1 |
| Jan 6, 2022 | 8.63% (0.08626) | 85.39th | v1 |
| Jan 5, 2022 | 2.06% (0.02061) | 77.63th | v1 |
| Jun 8, 2021 | 2.06% (0.02061) | 0.00th | v1 |
| Jun 2, 2021 | 8.63% (0.08626) | 0.00th | v1 |
| Jun 1, 2021 | 2.06% (0.02061) | 0.00th | v5 (v2026.06.15) |
| Apr 14, 2021 | 1.81% (0.01806) | 0.00th | v1 |
References (12)
- http://lists.opensuse.org/opensuse-security-announce/2019-11/msg00015.html vendor-advisoryThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2019-14847 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1764142 Issue Tracking
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14847 ExploitIssue Tracking
- https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html mailing-list
- https://lists.debian.org/debian-lts-announce/2023/09/msg00013.html mailing-list
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OKPYHDFI7HRELVXBE5J4MTGSI35AKFBI/ vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XQ3IUACPZJXSC4OM6P2V4IC4QMZQZWPD/ vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2019-14847
- https://www.cve.org/CVERecord?id=CVE-2019-14847
- https://www.samba.org/samba/security/CVE-2019-14847.html Vendor Advisory
- https://www.synology.com/security/advisory/Synology_SA_19_35
Change history (0)
No recorded changes yet.