CVE-2019-8936
NTP through 4.2.8p12 has a NULL Pointer Dereference.
7.5 HighPublic exploitFix available
NTP through 4.2.8p12 has a NULL Pointer Dereference.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
5.73%Down 7.5 points since Apr 14, 2021
What each source reports
NVD Score used
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
CVE-2019-8936- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-476
- Updated
- 2026-11-02
CVE List No score
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
CVE-2019-8936- Updated
- 2026-11-02
EUVDEUVD-2019-18324 No score
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
EUVD-2019-18324- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-54w8-prj8-6v5f
NTP through 4.2.8p12 has a NULL Pointer Dereference.
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
GHSA-54w8-prj8-6v5f- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-476
- Updated
- 2026-11-02
OSV
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
CVE-2019-8936- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2019-8936
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
DEBIAN-CVE-2019-8936- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Show 13 moreShow less
OSVUBUNTU-CVE-2019-8936
NTP through 4.2.8p12 has a NULL Pointer Dereference.
- Record
UBUNTU-CVE-2019-8936- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 3.0
- 7.5 High
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVCLSA-2026-1777453146 No score
ntp: Fix of 2 CVEs
- CVE-2018-7185: unauthenticated packet with a zero-origin timestamp can reset an authenticated interleave association leading to denial of service.
- CVE-2019-8936: NULL pointer dereference triggered by an authenticated mode 6 control packet with no value field.
- Record
CLSA-2026-1777453146- Updated
- 2026-11-02
OSVCLSA-2026-1777453307 No score
ntp: Fix of 2 CVEs
- CVE-2018-7185: unauthenticated packet with a zero-origin timestamp can reset an authenticated interleave association leading to denial of service.
- CVE-2019-8936: NULL pointer dereference triggered by an authenticated mode 6 control packet with no value field.
- Record
CLSA-2026-1777453307- Updated
- 2026-11-02
OSVMGASA-2019-0140 No score
Updated ntp packages fix security vulnerability
A null pointer exception which could allow an authenticated attacker to cause segmentation fault to ntpd. (CVE-2019-8936)
- Record
MGASA-2019-0140- Updated
- 2026-11-02
OSVopenSUSE-SU-2019:1143-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other issues addressed:
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
This update was imported from the SUSE:SLE-15:Update update project.
- Record
openSUSE-SU-2019:1143-1- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11102-1 No score
ntp-4.2.8p15-7.2 on GA media
These are all security issues fixed in the ntp-4.2.8p15-7.2 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11102-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:0775-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other issues addressed:
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
- Record
SUSE-SU-2019:0775-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:0777-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other issues addressed:
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
- Record
SUSE-SU-2019:0777-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:0789-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other isses addressed:
- Fixed an issue which caused openSSL mismatch (bsc#1125401)
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
- Record
SUSE-SU-2019:0789-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:13991-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other issues addressed:
- Make sure that SLE12 version is higher than the one in SLE11 (bsc#1001182).
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
- Record
SUSE-SU-2019:13991-1- Updated
- 2026-11-02
OSVSUSE-SU-2019:14004-1 No score
Security update for ntp
This update for ntp fixes the following issues:
Security issue fixed:
- CVE-2019-8936: Fixed a null pointer exception which could allow an authenticated attcker to cause segmentation fault to ntpd (bsc#1128525).
Other issues addressed:
- Make sure that SLE12 version is higher than the one in SLE11 (bsc#1001182).
- Fixed several bugs in the BANCOMM reclock driver.
- Fixed ntp_loopfilter.c snprintf compilation warnings.
- Fixed spurious initgroups() error message.
- Fixed STA_NANO struct timex units.
- Fixed GPS week rollover in libparse.
- Fixed incorrect poll interval in packet.
- Added a missing check for ENABLE_CMAC.
- Record
SUSE-SU-2019:14004-1- Updated
- 2026-11-02
OSVUSN-4563-1 No score
ntp vulnerability
It was discovered that the fix for CVE-2018-7182 introduced a NULL pointer dereference into NTP. An attacker could use this vulnerability to cause a denial of service (crash).
- Record
USN-4563-1- Updated
- 2026-11-02
OSVUSN-4563-2 No score
ntp vulnerability
USN-4563-1 fixed a vulnerability in NTP. This update provides the corresponding update for Ubuntu 20.04 LTS and Ubuntu 20.10.
Original advisory details:
It was discovered that the fix for CVE-2018-7182 introduced a NULL pointer dereference into NTP. An attacker could use this vulnerability to cause a denial of service (crash).
- Record
USN-4563-2- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ntpTuxCare:CentOS:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntp-docTuxCare:CentOS:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntp-perlTuxCare:CentOS:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntpdateTuxCare:CentOS:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntpTuxCare:OracleLinux:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntp-docTuxCare:OracleLinux:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntp-perlTuxCare:OracleLinux:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntpdateTuxCare:OracleLinux:6 From an advisory covering 2 CVEs |
before 4.2.6p5-16.el6.tuxcare.els2 | 4.2.6p5-16.el6.tuxcare.els2 |
ntpDebian:11 |
before 1:4.2.8p12+dfsg-4 | 1:4.2.8p12+dfsg-4 |
ntpMageia:6 |
before 4.2.8p13-1.mga6 | 4.2.8p13-1.mga6 |
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| Package | Affected | Fixed |
|---|---|---|
ntpSUSE:Linux Enterprise Server 12-LTSS |
before 4.2.8p13-46.32.1 | 4.2.8p13-46.32.1 |
ntpSUSE:Linux Enterprise Module for Legacy 15 |
before 4.2.8p13-4.6.1 | 4.2.8p13-4.6.1 |
ntpSUSE:OpenStack Cloud 7 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Desktop 12 SP3 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Desktop 12 SP4 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server for SAP Applications 12 SP1 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server for SAP Applications 12 SP2 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 12 SP1-LTSS |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 12 SP2-LTSS |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 12 SP2-BCL |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 12 SP3 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server for SAP Applications 12 SP3 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 12 SP4 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server for SAP Applications 12 SP4 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Enterprise Storage 4 |
before 4.2.8p13-85.1 | 4.2.8p13-85.1 |
ntpSUSE:Linux Enterprise Server 11 SP4 |
before 4.2.8p13-64.13.1 | 4.2.8p13-64.13.1 |
ntpSUSE:Linux Enterprise Server for SAP Applications 11 SP4 |
before 4.2.8p13-64.13.1 | 4.2.8p13-64.13.1 |
ntpSUSE:Linux Enterprise Point of Sale 11 SP3 |
before 4.2.8p13-48.27.1 | 4.2.8p13-48.27.1 |
ntpUbuntu:18.04:LTS |
before 1:4.2.8p10+dfsg-5ubuntu7.3, plus listed versions 1:4.2.8p10+dfsg-5ubuntu31:4.2.8p10+dfsg-5ubuntu41:4.2.8p10+dfsg-5ubuntu51:4.2.8p10+dfsg-5ubuntu61:4.2.8p10+dfsg-5ubuntu71:4.2.8p10+dfsg-5ubuntu7.11:4.2.8p10+dfsg-5ubuntu7.2 |
1:4.2.8p10+dfsg-5ubuntu7.3 |
ntpUbuntu:20.04:LTS |
before 1:4.2.8p12+dfsg-3ubuntu4.20.04.1, plus listed versions 1:4.2.8p12+dfsg-3ubuntu21:4.2.8p12+dfsg-3ubuntu31:4.2.8p12+dfsg-3ubuntu4 |
1:4.2.8p12+dfsg-3ubuntu4.20.04.1 |
ntpUbuntu:22.04:LTS |
before 1:4.2.8p12+dfsg-3ubuntu6 | 1:4.2.8p12+dfsg-3ubuntu6 |
ntpopenSUSE:Leap 15.0 |
before 4.2.8p13-lp150.8.1 | 4.2.8p13-lp150.8.1 |
ntpopenSUSE:Tumbleweed From an advisory covering 18 CVEs |
before 4.2.8p15-7.2 | 4.2.8p15-7.2 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | snappyJack/CVE-2019-8936 | 2020-04-26 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-8936 is a high vulnerability (CVSS 7.5) in Ntp, published March 27, 2019. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 5.73%, the 93rd percentile. Fixed in ntp 1:4.2.8p12+dfsg-4.
References
security.gentoo.org/glsa/201903-15
support.ntp.org/bin/view/Main/SecurityNotice
lists.opensuse.org/opensuse-security-announce/2019-04/msg00032.html
lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KQDNHNYOJK2SRSGO23GQ2RXTOUY2HLNN
Show 52 moreShow less
security.netapp.com/advisory/ntap-20190503-0001
security.FreeBSD.org/advisories/FreeBSD-SA-19:04.ntp.asc
seclists.org/bugtraq/2019/May/39
bugs.ntp.org/show_bug.cgi?id=3565
packetstormsecurity.com/files/152915/FreeBSD-Security-Advisory-FreeBSD-SA-19-04.ntp.html
support.f5.com/csp/article/K61363039
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
usn.ubuntu.com/4563-1
nvd.nist.gov/vuln/detail/CVE-2019-8936
github.com/advisories/GHSA-54w8-prj8-6v5f
errata.tuxcare.com/els_os/centos6els/CLSA-2026-1777453146.html
security-tracker.debian.org/tracker/CVE-2019-8936
advisories.mageia.org/MGASA-2019-0140.html
bugs.mageia.org/show_bug.cgi?id=24585
lists.suse.com/pipermail/sle-security-updates/2019-March/005258.html
suse.com/support/update/announcement/2019/suse-su-20190775-1
bugzilla.suse.com/1128525
ubuntu.com/security/CVE-2019-8936
bk.ntp.org/ntp-stable/ntpd/ntp_control.c?PAGE=diffs&REV=5c8106e7wWtXdh0lzg1ytlWribBTcQ
cve.org/CVERecord?id=CVE-2019-8936