samba: AD DC Denial of Service in DNS management server
Published Jun 19, 2019
6.5
MEDIUMCVSS 3.0
EPSS 2.18%
Description
Samba 4.9.x before 4.9.9 and 4.10.x before 4.10.5 has a NULL pointer dereference, leading to Denial of Service. This is related to the AD DC DNS management server (dnsserver) RPC server process.
Affected products
No data.
No data.
Red Hat Enterprise Linux 5
samba
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 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 issue did not affect the version of samba as shipped with 'Red Hat Gluster Storage 3' as they did not include support for Active Directory Domain Controller.
Red Hat mitigation
The dnsserver task can be stopped by setting 'dcerpc endpoint servers = -dnsserver' in the smb.conf and restarting Samba.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
CVSS:3.0/AV:N/AC:L/PR:L/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 1, 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 (22 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.18% (0.02179) | 81.69th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.18% (0.02179) | 79.94th | v5 (v2026.06.15) |
| Feb 26, 2026 | 4.27% (0.04269) | 88.61th | v4 (v2025.03.14) |
| Nov 21, 2025 | 6.37% (0.06371) | 90.59th | v4 (v2025.03.14) |
| Nov 18, 2025 | 3.24% (0.03241) | 85.88th | v4 (v2025.03.14) |
| Mar 30, 2025 | 6.69% (0.06685) | 90.32th | v4 (v2025.03.14) |
| Mar 29, 2025 | 8.53% (0.08527) | 87.09th | v4 (v2025.03.14) |
| Mar 19, 2025 | 6.69% (0.06685) | 90.07th | v4 (v2025.03.14) |
| Mar 17, 2025 | 5.10% (0.05105) | 89.08th | v4 (v2025.03.14) |
| Jul 20, 2024 | 1.72% (0.01723) | 88.02th | v3 (v2023.03.01) |
| Jun 12, 2024 | 1.72% (0.01723) | 87.88th | v3 (v2023.03.01) |
| May 28, 2024 | 1.13% (0.01126) | 84.60th | v3 (v2023.03.01) |
| Oct 31, 2023 | 0.89% (0.00886) | 80.78th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.63% (0.00626) | 76.33th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.65% (0.00652) | 76.26th | 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 | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.06% (0.02061) | 0.00th | v1 |
References (11)
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00023.html vendor-advisoryx_refsource_SUSE
- http://www.securityfocus.com/bid/108825 vdb-entryx_refsource_BID
- https://access.redhat.com/security/cve/CVE-2019-12435 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1711816 Issue Tracking
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSG3TLPZP35RH5DWAIDC7MHXRK5DFKOE/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2019-12435
- https://usn.ubuntu.com/4018-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2019-12435
- https://www.samba.org/samba/security/CVE-2019-12435.html x_refsource_CONFIRMVendor Advisory
- https://www.synology.com/security/advisory/Synology_SA_19_27 x_refsource_CONFIRM
| Link | Providers | Tags |
|---|---|---|
| http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00023.html | vendor-advisoryx_refsource_SUSE | |
| http://www.securityfocus.com/bid/108825 | vdb-entryx_refsource_BID | |
| https://access.redhat.com/security/cve/CVE-2019-12435 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1711816 | Issue Tracking | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QSG3TLPZP35RH5DWAIDC7MHXRK5DFKOE/ | vendor-advisoryx_refsource_FEDORA | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/ | vendor-advisoryx_refsource_FEDORA | |
| https://nvd.nist.gov/vuln/detail/CVE-2019-12435 | ||
| https://usn.ubuntu.com/4018-1/ | vendor-advisoryx_refsource_UBUNTU | |
| https://www.cve.org/CVERecord?id=CVE-2019-12435 | ||
| https://www.samba.org/samba/security/CVE-2019-12435.html | x_refsource_CONFIRMVendor Advisory | |
| https://www.synology.com/security/advisory/Synology_SA_19_27 | x_refsource_CONFIRM |
Change history (0)
No recorded changes yet.