Is CVE-2015-7850 in the CISA KEV catalog?

No. CVE-2015-7850 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7850?

CVE-2015-7850 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2015-7850?

CVE-2015-7850 has an EPSS score of 4.97% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7850?

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

CVE & CISA-KEV Catalog

CVE-2015-7850

MEDIUMEPSS 91th pctl

6.5

CVSS v3

NVD

Description

ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to cause a denial of service (infinite loop or crash) by pointing the key file at the log file.

CWE-835

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p4+dfsg-1CVE-2015-7850

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

4.97%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Patch1

support.ntp.org

Third-Party Advisory6

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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 2026-05-13.