PatchTheCVECVE-2019-8936: NTP through 4.2.8p12 has a NULL Pointer Dereference.
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HIGH 7.5REMOTEUPGRADEMITIGATEMITIGATE
CVE-2019-8936 is a high-severity flaw (CVSS 7.5) affecting clustered data ontap, data ontap, fedora. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
NTP through 4.2.8p12 has a NULL Pointer Dereference.
Why this priority
- High severity
- EPSS top 7%: very likely to be exploited
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 5.7% (top 7%) |
| CISA exploited list | No |
| Weakness | CWE-476 |
| Published | 2019-05-15 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
netapp clustered data ontap UPGRADE
Affected: < 9.2
Fixed in: 9.2
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
netapp data ontap MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
fedoraproject fedora MITIGATE
Affected: 28 · 29 · 30
Fixed in: no fixed release known
Safe to downgrade to: a release before 28
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
opensuse leap MITIGATE
Affected: 15.0 · 42.3
Fixed in: no fixed release known
Safe to downgrade to: a release before 15.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
hpe hpux-ntp UPGRADE
Affected: < c.4.2.8.4.0
Fixed in: c.4.2.8.4.0
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy hpux-ntp || rpm -q hpux-ntp || hpux-ntp --version
2. UPGRADE to c.4.2.8.4.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade hpux-ntp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade hpux-ntp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
ntp ntp UPGRADE
Affected: < 4.2.8 · 4.2.8 · 4.2.8 p1 · 4.2.8 p1-beta1 · 4.2.8 p1-beta2 · 4.2.8 p1-beta3 · 4.2.8 p1-beta4 · 4.2.8 p1-beta5
Fixed in: 4.2.8
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy ntp || rpm -q ntp || ntp --version
2. UPGRADE to 4.2.8 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade ntp
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade ntp
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2019-8936?
clustered data ontap: upgrade to 9.2; data ontap: mitigate or apply the listed mitigation; fedora: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2019-8936 being exploited?
CVE-2019-8936 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2019-8936 affect?
CVE-2019-8936 affects clustered data ontap, data ontap, fedora. Severity is high (CVSS 7.5). NTP through 4.2.8p12 has a NULL Pointer Dereference.
How urgent is CVE-2019-8936?
Priority 60/100. High severity; EPSS top 7%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action
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