HIGH
ntp: Crafted null dereference attack in authenticated mode 6 packet
Published May 15, 2019
7.5
HIGHCVSS 3.1
EPSS 5.73%
Description
NTP through 4.2.8p12 has a NULL Pointer Dereference.
Affected products
No data.
Configuration 1
OR
- < 9.2
- n/a
Configuration 2
OR
- 28
- 29
- 30
Configuration 4
- < c.4.2.8.4.0
Configuration 5
OR
- < 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
- 4.2.8
No data.
Red Hat Enterprise Linux 5
ntp
Not affected
Red Hat Enterprise Linux 6
ntp
Not affected
Red Hat Enterprise Linux 7
ntp
Not affected
Red Hat Virtualization 4
redhat-virtualization-host
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 5 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 6 | ntp | Not affected | n/a |
| Red Hat Enterprise Linux 7 | ntp | 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 versions of ntp as shipped with Red Hat Enterprise Linux 5, 6, and 7.
Metrics
No CVSS v4.0 score for this CVE.
7.5 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.3 MEDIUM Red Hat
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
5.73% 0.05726
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.05726
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (31 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 5.73% (0.05726) | 92.81th | v5 (v2026.06.15) |
| Jun 15, 2026 | 5.73% (0.05726) | 92.03th | v5 (v2026.06.15) |
| Dec 28, 2025 | 24.49% (0.24493) | 95.93th | v4 (v2025.03.14) |
| Dec 27, 2025 | 13.45% (0.13454) | 94.01th | v4 (v2025.03.14) |
| Dec 16, 2025 | 24.49% (0.24493) | 95.91th | v4 (v2025.03.14) |
| Dec 14, 2025 | 21.51% (0.21510) | 95.51th | v4 (v2025.03.14) |
| Dec 13, 2025 | 23.44% (0.23443) | 95.77th | v4 (v2025.03.14) |
| Nov 21, 2025 | 13.45% (0.13454) | 93.92th | v4 (v2025.03.14) |
| Nov 18, 2025 | 21.23% (0.21227) | 95.28th | v4 (v2025.03.14) |
| Nov 10, 2025 | 13.45% (0.13454) | 93.91th | v4 (v2025.03.14) |
| Mar 30, 2025 | 8.69% (0.08689) | 91.64th | v4 (v2025.03.14) |
| Mar 29, 2025 | 14.24% (0.14245) | 90.66th | v4 (v2025.03.14) |
| Mar 28, 2025 | 8.69% (0.08689) | 91.65th | v4 (v2025.03.14) |
| Mar 27, 2025 | 14.24% (0.14245) | 93.44th | v4 (v2025.03.14) |
| Mar 20, 2025 | 8.69% (0.08689) | 91.75th | v4 (v2025.03.14) |
| Mar 19, 2025 | 14.24% (0.14245) | 93.57th | v4 (v2025.03.14) |
| Mar 17, 2025 | 8.69% (0.08689) | 91.83th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.52% (0.00522) | 77.64th | v3 (v2023.03.01) |
| Jul 1, 2024 | 0.83% (0.00835) | 82.16th | v3 (v2023.03.01) |
| May 8, 2024 | 0.76% (0.00759) | 81.02th | v3 (v2023.03.01) |
| Mar 20, 2024 | 0.60% (0.00603) | 78.03th | v3 (v2023.03.01) |
| Nov 26, 2023 | 0.72% (0.00717) | 78.35th | v3 (v2023.03.01) |
| Oct 11, 2023 | 0.55% (0.00547) | 74.78th | v3 (v2023.03.01) |
| Apr 21, 2023 | 0.53% (0.00525) | 73.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.46% (0.00460) | 71.46th | v3 (v2023.03.01) |
| Mar 6, 2023 | 23.44% (0.23437) | 96.70th | v2 (v2022.01.01) |
| Feb 4, 2022 | 23.44% (0.23437) | 94.77th | v2 (v2022.01.01) |
| Feb 3, 2022 | 13.21% (0.13208) | 89.07th | v1 |
| Jan 6, 2022 | 13.21% (0.13208) | 88.94th | v1 |
| Sep 1, 2021 | 13.21% (0.13208) | 96.01th | v1 |
| Apr 14, 2021 | 13.21% (0.13208) | 0.00th | v1 |
Weaknesses (2)
References (19)
- http://bugs.ntp.org/show_bug.cgi?id=3565 x_refsource_CONFIRMExploitIssue TrackingVendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00032.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00036.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://packetstormsecurity.com/files/152915/FreeBSD-Security-Advisory-FreeBSD-SA-19-04.ntp.html x_refsource_MISCThird Party AdvisoryVDB Entry
- http://support.ntp.org/bin/view/Main/SecurityNotice x_refsource_MISCRelease NotesVendor Advisory
- https://access.redhat.com/security/cve/CVE-2019-8936 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1686605 Issue Tracking
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2NVS2CSG2TQ663CXOZZUJN4STQPMENNP/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JBGXY7OKWOLT6X6JAPVZRFEP4FLCGGST/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQDNHNYOJK2SRSGO23GQ2RXTOUY2HLNN/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2019-8936
- https://seclists.org/bugtraq/2019/May/39 mailing-listx_refsource_BUGTRAQIssue TrackingMailing ListThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-19:04.ntp.asc vendor-advisoryx_refsource_FREEBSDMitigationThird Party Advisory
- https://security.gentoo.org/glsa/201903-15 vendor-advisoryx_refsource_GENTOOThird Party Advisory
- https://security.netapp.com/advisory/ntap-20190503-0001/ x_refsource_CONFIRMPatchThird Party Advisory
- https://support.f5.com/csp/article/K61363039 x_refsource_CONFIRMThird Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us x_refsource_CONFIRMThird Party Advisory
- https://usn.ubuntu.com/4563-1/ vendor-advisoryx_refsource_UBUNTU
- https://www.cve.org/CVERecord?id=CVE-2019-8936
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published May 15, 2019
Updated Aug 4, 2024
Reserved Feb 19, 2019
Link CVE-2019-8936
CISA Vulnrichment
Updated n/a