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CVE-2016-2518

26
FAUCET Score

CVE-2016-2518 is an out-of-bounds read vulnerability in the MATCH_ASSOC function of NTP versions prior to 4.2.8p9 and 4.3.x prior to 4.3.92, affecting products from vendors like Debian, FreeBSD, and Red Hat. This medium-severity vulnerability (CVSS 5.3) can be exploited remotely with low attack complexity, potentially leading to a denial of service. While there is no evidence of active exploitation, no public exploit code, and limited community discussion, it has received some media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
>= 4.3.0, < 4.3.92CPE 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

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
15.08%
Probability of exploitation in next 30 days
EPSS Percentile
96.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1508 is in the 96th percentile among its peer group of 23,703 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

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

Remediation

Patch Available

Vendor Patches (4)

oraclepatch availablevia nvd_reference
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-10.el6.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.7 Extended Update SupportFixed in: ntp-0:4.2.6p5-5.el6_7.5
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-22.el7_2.2
View patch

Vendor Advisories (1)

redhatCVE-2016-2518Low

ntp: out-of-bounds references on crafted packet

Apr 26, 2016

References

lists.fedoraproject.org / pipermail/package-announce/2016-May/183647.html
lists.fedoraproject.org / pipermail/package-announce/2016-May/184669.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00034.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00037.html
lists.opensuse.org / opensuse-security-announce/2016-05/msg00052.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00001.html
lists.opensuse.org / opensuse-security-announce/2016-06/msg00020.html
lists.opensuse.org / opensuse-security-announce/2016-07/msg00026.html
lists.opensuse.org / opensuse-security-announce/2016-08/msg00042.html
lists.opensuse.org / opensuse-updates/2016-05/msg00114.html
packetstormsecurity.com / files/136864/Slackware-Security-Advisory-ntp-Updates.html
rhn.redhat.com / errata/RHSA-2016-1552.html
Broken Link
access.redhat.com / errata/RHSA-2016:1141
Third Party Advisory
cert-portal.siemens.com / productcert/pdf/ssa-211752.pdf
Third Party Advisory
security.freebsd.org / advisories/FreeBSD-SA-16:16.ntp.asc
Third Party Advisory
security.gentoo.org / glsa/201607-15
Third Party Advisory
security.netapp.com / advisory/ntap-20171004-0002
Third Party Advisory
support.f5.com / csp/article/K20804323
support.ntp.org / bin/view/Main/NtpBug3009
Vendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-159-11
debian.org / security/2016/dsa-3629
kb.cert.org / vuls/id/718152
Third Party AdvisoryUS Government Resource
tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20160428-ntpd
debian.org / security/2016/dsa-3629
Third Party Advisory
oracle.com / technetwork/security-advisory/cpujan2018-3236628.html
PatchThird Party Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
oracle.com / technetwork/topics/security/linuxbulletinapr2016-2952096.html
Third Party Advisory
securityfocus.com / archive/1/538233/100/0/threaded
securityfocus.com / archive/1/archive/1/538233/100/0/threaded
securityfocus.com / bid/88226
Third Party AdvisoryVDB Entry
securitytracker.com / id/1035705
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-3096-1