CVE-2015-5300
HIGHEPSS 95th pctlDescription
The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greater than 128 milliseconds by default, which allows remote attackers to set NTP to an arbitrary time when started with the -g option, or to alter the time by up to 900 seconds otherwise by responding to an unspecified number of requests from trusted sources, and leveraging a resulting denial of service (abort and restart).
How to fix
This Ubuntu release reached end-of-life on 2019-04-02.
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploit Intelligence
Very high risk: more likely to be exploited than 95% of all known CVEs.
References
- aix.software.ibm.com
- lists.fedoraproject.org
- lists.fedoraproject.org
- lists.fedoraproject.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- lists.opensuse.org
- rhn.redhat.com
- seclists.org
- debian.org
- oracle.com
- securityfocus.com
- securitytracker.com
- ubuntu.com
- bto.bluecoat.com
- ics-cert.us-cert.gov
- support.citrix.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- www-01.ibm.com
- cs.bu.edu
- freebsd.org
- ibm.com
- oracle.com
- oracle.com
Related Vulnerabilities
Other CWE-361 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2016-7547 | Critical | 9.8 | 93% | - | - |
| CVE-2016-1643 | High | 8.8 | 2.7% | - | Fix |
| CVE-2016-1000345 | Medium | 5.9 | 2.6% | - | Fix |
| CVE-2016-1000341 | Medium | 5.9 | 2.6% | - | Fix |
| CVE-2016-7036 | Critical | 9.8 | 2.1% | - | - |
| CVE-2016-7037 | High | 7.5 | 0.7% | - | - |
Common questions
How do I fix CVE-2015-5300?
Published advisories record a fix for 2 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2015-5300 being actively exploited?
Not that we know of. CVE-2015-5300 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 9.1% is the estimated probability that it will be exploited in the next 30 days. That is higher than 95% of all scored CVEs.
How severe is CVE-2015-5300?
CVE-2015-5300 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2015-5300 affect?
Published advisories record a fix for ntp (Debian), ntp (Ubuntu). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-17.