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CVE-2015-7704

23
FAUCET Score

CVE-2015-7704 describes a denial-of-service vulnerability in the ntpd client of NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77, impacting various products including Citrix, Debian, McAfee, NetApp, and Red Hat. This high-severity vulnerability (CVSS 7.5) allows remote attackers to disrupt service by sending specially crafted "KOD" messages, requiring no user interaction or authentication. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered significant community discussion and media coverage, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
>= 4.2.0, < 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.77CPE 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

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
10.95%
Probability of exploitation in next 30 days
EPSS Percentile
95.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.1095 is in the 93rd percentile among its peer group of 51,485 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, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (4)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-5.el6_7.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.5 Extended Update SupportFixed in: ntp-0:4.2.6p5-2.el6_5.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.6 Extended Update SupportFixed in: ntp-0:4.2.6p5-3.el6_6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-19.ael7b_1.3
View patch

Vendor Advisories (1)

redhatCVE-2015-7704Important

ntp: disabling synchronization via crafted KoD packet

Oct 21, 2015

References

bugs.ntp.org / show_bug.cgi
Issue TrackingVendor Advisory
rhn.redhat.com / errata/RHSA-2015-1930.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2015-2520.html
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Issue TrackingThird Party AdvisoryVDB Entry
eprint.iacr.org / 2015/1020.pdf
Technical DescriptionThird Party Advisory
h20566.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
Third Party AdvisoryVDB Entry
kc.mcafee.com / corporate/index
Third Party Advisory
security.gentoo.org / glsa/201607-15
Third Party AdvisoryVDB Entry
security.netapp.com / advisory/ntap-20171004-0001
Third Party Advisory
security.netapp.com / advisory/ntap-20171004-0002
Third Party Advisory
support.citrix.com / article/CTX220112
Third Party Advisory
support.ntp.org / bin/view/Main/NtpBug2901
Vendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Release NotesVendor Advisory
arista.com / en/support/advisories-notices/security-advisories/1212-security-advisory-0016
cs.bu.edu / ~goldbe/NTPattack.html
Third Party Advisory
kb.cert.org / vuls/id/718152
Third Party AdvisoryUS Government Resource
debian.org / security/2015/dsa-3388
Third Party Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
securityfocus.com / bid/77280
Third Party AdvisoryVDB Entry
securitytracker.com / id/1033951
Third Party AdvisoryVDB Entry