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CVE-2013-5211

83
FAUCET Score

CVE-2013-5211 is a denial-of-service vulnerability affecting NTP versions prior to 4.2.7p26, including various Linux distributions and Oracle products. It allows remote attackers to amplify traffic via forged monlist requests, leading to a denial of service. The vulnerability has a CVSS score of 5.0, indicating a network-based attack with low complexity and potential for partial availability impact. This CVE was actively exploited in the wild in December 2013, with public exploit code available in Metasploit and ExploitDB, and garnered significant community and media attention.

Impacted Technologies

VendorProductVersion(s)CPE
11.4CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
< 4.2.7CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
4.2.7CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.7:-:*:*:*:*:*:*
4.2.7CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.7:p0:*:*:*:*:*:*
4.2.7CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.7:p1:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
97.76%
Probability of exploitation in next 30 days
EPSS Percentile
99.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
Metasploit: NTP Mode 7 PEER_LIST DoS Scanner · Aug 25, 2014
ExploitDB: EDB-33073 · Apr 28, 2014
This CVE's current EPSS score of 0.9776 is in the 100th percentile among its peer group of 23,701 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

Vendor Patches (2)

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

Vendor Advisories (1)

redhatCVE-2013-5211Moderate

ntp: DoS in monlist feature in ntpd

Apr 20, 2010

References

aix.software.ibm.com / aix/efixes/security/ntp_advisory.asc
Third Party Advisory
bugs.ntp.org / show_bug.cgi
Issue Tracking
ics-cert.us-cert.gov / advisories/ICSA-14-051-04
Third Party AdvisoryUS Government Resource
lists.ntp.org / pipermail/pool/2011-December/005616.html
Broken Link
lists.opensuse.org / opensuse-updates/2014-09/msg00031.html
Third Party Advisory
marc.info
Mailing List
marc.info
Mailing ListThird Party Advisory
openwall.com / lists/oss-security/2013/12/30/6
Mailing List
openwall.com / lists/oss-security/2013/12/30/7
Mailing List
secunia.com / advisories/59288
Not Applicable
secunia.com / advisories/59726
Not Applicable
h20564.www2.hpe.com / portal/site/hpsc/public/kb/docDisplay
Third Party Advisory
puppet.com / security/cve/puppetlabs-ntp-nov-2015-advisory
Broken Link
www-947.ibm.com / support/entry/portal/docdisplay
Broken Link
www-947.ibm.com / support/entry/portal/docdisplay
Broken Link
eecis.udel.edu / ~ntp/ntp_spool/ntp4/ntp-dev/ntp-dev-4.2.7p26.tar.gz
Patch
kb.cert.org / vuls/id/348126
Third Party AdvisoryUS Government Resource
oracle.com / technetwork/topics/security/linuxbulletinjul2016-3090544.html
Third Party Advisory
securityfocus.com / bid/64692
Broken LinkThird Party AdvisoryVDB Entry
securitytracker.com / id/1030433
Third Party AdvisoryVDB Entry
us-cert.gov / ncas/alerts/TA14-013A
Third Party AdvisoryUS Government Resource