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Fencer Intel
medium 5.0

CVE-2013-5211 json

The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplifica…

published 12y ago modified 4mo ago also EUVD-2013-5051

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
97.5%
EPSS 97.5% chance of exploitation in 30 days, percentile 99.9%
public exploits
11
Metasploit and Exploit-DB

Summary

The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests, as exploited in the wild in December 2013.

Patch / fix

  • ntp ntp 4.2.7
  • ntp Debian 11 1:4.2.8p3+dfsg-1

debian advisories DEBIAN-CVE-2013-5211

  • ntp openSUSE Tumbleweed 4.2.8p9-1.1

opensuse advisories openSUSE-SU-2024:10181-1

Is CVE-2013-5211 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2013-5211 updated cvss 4.3

ntp: DoS in monlist feature in ntpd

  • Red Hat Enterprise Linux 5 ntp Red Hat Enterprise Linux 6 ntp, ntpdate, ntp-perl
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux 7 ntp, sntp, ntpdate, ntp-perl
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-14-051-04 updated cvss 7.8

NTP Reflection Attack

  • NTP service NTP (with MONLIST support) <=4.2.7p25
    affected: mitigation “NTP can be upgraded to NTP-4.2.7p26 or later that removes MONLIST support and is replaced with the more secure MRUNLIST function.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-24-352-02 updated cvss 5.3

Hitachi Energy TropOS Devices Series 1400/2400/6400

  • Hitachi Energy TropOS devices series 1400/2400/6400 <8.9.6
    affected: mitigation “Hitachi Energy has identified the following specific workarounds and mitigations users can apply to reduce risk:” publisher.hitachienergy.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Timeline

  1. Published
  2. First public exploit (EDB-33073)

Exploit prediction

97.55% chance of exploitation in the next 30 days, higher than 99.9% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

CVSS scores

assigned by version score vector
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.