Is CVE-2015-7973 in the CISA KEV catalog?

No. CVE-2015-7973 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7973?

CVE-2015-7973 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2015-7973?

CVE-2015-7973 has an EPSS score of 3.33% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7973?

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-2015-7973

MEDIUMEPSS 87th pctl

6.5

CVSS v3

NVD

Description

NTP before 4.2.8p6 and 4.3.x before 4.3.90, when configured in broadcast mode, allows man-in-the-middle attackers to conduct replay attacks by sniffing the network.

CWE-254

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p7+dfsg-1CVE-2015-7973

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityHigh

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

Exploit Intelligence

3.33%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

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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.