Is CVE-2015-5300 in the CISA KEV catalog?

No. CVE-2015-5300 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-5300?

CVE-2015-5300 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2015-5300?

CVE-2015-5300 has an EPSS score of 9.13% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-5300?

Upgrade ntp on debian 11 to 1:4.2.8p4+dfsg-2 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-5300

HIGHEPSS 95th pctl

7.5

CVSS v3

NVD

Description

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).

CWE-361

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p4+dfsg-2CVE-2015-5300

ntpUbuntu

Fixed in:1:4.2.6.p5+dfsg-3ubuntu2.14.04.5USN-2783-1

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

9.13%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Embed a live status badge for CVE-2015-5300

Markdown

[![CVE-2015-5300](https://tridentstack.com/cve/badge/CVE-2015-5300.svg)](https://tridentstack.com/cve/CVE-2015-5300)

HTML

<a href="https://tridentstack.com/cve/CVE-2015-5300"><img src="https://tridentstack.com/cve/badge/CVE-2015-5300.svg" alt="CVE-2015-5300"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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 2026-05-13.