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CVE-2015-7973

18
FAUCET Score

CVE-2015-7973 is a medium-severity vulnerability affecting NTP versions before 4.2.8p6 and 4.3.x before 4.3.90, specifically when configured in broadcast mode, impacting products from vendors like Canonical, FreeBSD, and Siemens. This flaw allows man-in-the-middle attackers to perform replay attacks by sniffing network traffic, potentially leading to a high impact on availability and a low impact on integrity. Despite its potential, there is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.90CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
4.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.36%
Probability of exploitation in next 30 days
EPSS Percentile
87.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0336 is in the 82nd percentile among its peer group of 19,956 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2015-7973Moderate

ntp: replay attack on authenticated broadcast mode

Jan 20, 2016

References

lists.opensuse.org / opensuse-security-announce/2016-04/msg00059.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-04/msg00060.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00020.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00038.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-05/msg00048.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-07/msg00026.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2016-08/msg00042.html
Broken Link
lists.opensuse.org / opensuse-updates/2016-05/msg00114.html
Broken Link
bto.bluecoat.com / security-advisory/sa113
Third Party Advisory
cert-portal.siemens.com / productcert/pdf/ssa-497656.pdf
Third Party Advisory
h20566.www2.hpe.com / hpsc/doc/public/display
Third Party Advisory
h20566.www2.hpe.com / hpsc/doc/public/display
Third Party Advisory
security.freebsd.org / advisories/FreeBSD-SA-16:09.ntp.asc
Third Party Advisory
security.gentoo.org / glsa/201607-15
Third Party Advisory
security.netapp.com / advisory/ntap-20171031-0001
Third Party Advisory
support.ntp.org / bin/view/Main/NtpBug2935
Vendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-103-11
Third Party AdvisoryUS Government Resource
kb.cert.org / vuls/id/718152
Third Party AdvisoryUS Government Resource
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160127-ntpd
Third Party Advisory
securityfocus.com / bid/81963
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034782
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3096-1
Third Party Advisory