Is CVE-2015-7974 in the CISA KEV catalog?

No. CVE-2015-7974 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7974?

CVE-2015-7974 has a CVSS v3 base score of 7.7 (HIGH).

What is the EPSS score for CVE-2015-7974?

CVE-2015-7974 has an EPSS score of 5.66% (92th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7974?

Upgrade ntp on debian 11 to 1:4.2.8p7+dfsg-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2015-7974

HIGHEPSS 92th pctl

7.7

CVSS v3

NVD

Description

NTP 4.x before 4.2.8p6 and 4.3.x before 4.3.90 do not verify peer associations of symmetric keys when authenticating packets, which might allow remote attackers to conduct impersonation attacks via an arbitrary trusted key, aka a "skeleton key."

CWE-287Improper Authentication

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p7+dfsg-1CVE-2015-7974

ntpUbuntu

Fixed in:1:4.2.6.p5+dfsg-3ubuntu2.14.04.10USN-3096-1

Fixed in:1:4.2.8p4+dfsg-3ubuntu5.3USN-3096-1

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

ScopeChanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

5.66%probability of exploitation in 30 days

92ndpercentile

High risk: more likely to be exploited than 92% of all known CVEs.

References

Exploit1

talosintel.com

Vendor Advisory2

Third-Party Advisory11

Related Vulnerabilities

Other CWE-287 (Improper Authentication) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-35082	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-35078	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2017-7921	Critical	9.8	100%	KEV	-
CVE-2024-7593	Critical	9.8	100%	KEV	-
CVE-2023-46805	High	8.2	100%	KEV + Ransom	-
CVE-2022-40684	Critical	9.8	100%	KEV + Ransom	Fix

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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 2026-05-06.