CVE-2013-5211

mediumpriority · attend · 64EPSS 0.975 · 100 %ileexploit · functionalDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

16 exploits · functional

Likely / severe?

97.5% (100th) EPSS

CVSS 5 · medium

Is it mine?

20 products

Check your exposure

Who says so?

6 sources

cnnvd · enisa_euvd · fstec_bdu · auma_psirt

EPSS · scored 2026-10-26

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedSIMA² Master Stationauma_psirt
Upgrade your SIMA2 to software version 2.6 or above. The NTP service of the SIMA2 Master Station with software version V2.6 and above includes a current, supported version of ntpd.
MitigationSIMA² Master Stationauma_psirt
1. If your SIMA2 does not need to provide time information to other systems or synchronize itself with an NTP server, disable the NTP client on those systems. Please note that the NTP client is disabled by default in SIMA2 2. In case you must use the NTP server on an SIMA2, choose from the following options to reduce NTP-based risks: - Allow NTP traffic to/from trusted NTP clients only - Monitor the network for malicious NTP traffic going to/coming from the SIMA2 - Filter malicious NTP traffic going to/coming from the SIMA2 Monitor NTP server operations on your SIMA2 (server availability, correctness of advertised time, NTP-related log entries, etc.) 3. In case you must use the NTP client on an SIMA2, choose from the following options to reduce NTP-based risks: - Use trusted NTP servers only - Allow NTP traffic to/from trusted NTP servers only - Monitor the network for malicious NTP traffic targeting the SIMA2 - Filter malicious NTP traffic targeting the SIMA2 - Monitor NTP client operations on your SIMA2 (correctness of system time, NTP-related log entries, etc.)
MitigationNTP service NTP (with MONLIST support)cisa_csaf_ot
NTP can be upgraded to NTP-4.2.7p26 or later that removes MONLIST support and is replaced with the more secure MRUNLIST function.
MitigationTropOS devices series 1400/2400/6400cisa_csaf_ot
Hitachi Energy has identified the following specific workarounds and mitigations users can apply to reduce risk:

cvss

Technical severity, 0–10. One row per scoring source.

7.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.7–7.8

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v2.07.8highAV:N/AC:L/Au:N/C:N/I:N/A:Csecondary · CISA US

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:P/E:Hsecondary · CVSS-BT (t0sche)

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Psecondary · AUMA PSIRT

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · CISA US

v3.14.7mediumAV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:Lsecondary · FSTEC (BDU) RU

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-20USprimaryCWE-20USCWE-20USCWE-406US

exploits (16)

Public proof-of-concept and weaponised exploit code.

auxiliary/scanner/ntp/ntp_monlistNTP Monitor List Scannerfunctional · metasploit
auxiliary/scanner/ntp/ntp_peer_list_dosNTP Mode 7 PEER_LIST DoS Scannerfunctional · metasploit
auxiliary/scanner/ntp/ntp_peer_list_sum_dosNTP Mode 7 PEER_LIST_SUM DoS Scannerfunctional · metasploit
auxiliary/scanner/ntp/ntp_readvarNTP Clock Variables Disclosurefunctional · metasploit
auxiliary/scanner/ntp/ntp_req_nonce_dosNTP Mode 6 REQ_NONCE DRDoS Scannerfunctional · metasploit
auxiliary/scanner/ntp/ntp_reslist_dosNTP Mode 7 GET_RESTRICT DRDoS Scannerfunctional · metasploit

affected products (20)

Products and version ranges known to be affected.

AUMA SIMA² Master Stationall versionsfixedauma_psirtDE
AUMA SIMA² Master Station< V2.6auma_psirtDE
NTP NTP service NTP (with MONLIST support): <=4.2.7p25all versionscisa_csaf_otUS
Hitachi Energy TropOS devices series 1400/2400/6400< 8.9.6cisa_csaf_otUS
NTP NTP service NTP (with MONLIST support)≤ 4.2.7p25cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
Fortinet Inc. FortiAnalyzer≤ 6.2.3fstec_bduRU
Fortinet Inc. FortiAnalyzer≤ 6.4.0fstec_bduRU
IBM Corp. AIX≤ 6.1fstec_bduRU
IBM Corp. AIX≤ 7.1fstec_bduRU
IBM Corp. AIX≤ 5.3fstec_bduRU
Network Time Foundation NTP≤ 4.2.7p26fstec_bduRU
Novell Inc. openSUSE≤ 11.4fstec_bduRU
Oracle Corp. Oracle Linux≤ 6fstec_bduRU
Oracle Corp. Oracle Linux≤ 7fstec_bduRU
ntp ntp< 4.2.7nvdUScpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
ntp ntp= 4.2.7nvdUScpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
opensuse opensuse= 11.4nvdUScpe:2.3:o:opensuse:opensuse:*:*:*:*:*:*:*:*
oracle linux= 6nvdUScpe:2.3:o:oracle:linux:*:*:*:*:*:*:*:*
oracle linux= 7nvdUScpe:2.3:o:oracle:linux:*:*:*:*:*:*:*:*

advisories (3)

Vendor and ecosystem advisories describing this.

VDE-2022-032AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service2022-08-09csaf · auma_psirtDE
The SIMA2 Master Station features an NTP service based on ntpd, a reference implementation of the Network Time Protocol (NTP). Affected SIMA2 Master Stations with software version < V2.6 include an outdated version of ntpd which is affected by a large number of vulnerabilities
ICSA-14-051-04NTP Reflection Attack2014-11-23icsa · cisa_csaf_otUS
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov
ICSA-24-352-02Hitachi Energy TropOS Devices Series 1400/2400/64002024-12-17icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu auma_psirt cisa_csaf_ot nvd NVD CVE.org MITRE

published 2014-01-02modified 2026-06-16

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+25138 more

references (63)

External citations — patches, advisories, analysis.

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