How severe is CVE-2013-5211?

No CVSS score has been assigned to CVE-2013-5211 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2013-5211?

Affected package information for CVE-2013-5211 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2013-5211?

No fixed version has been published for CVE-2013-5211 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2013-5211 actively exploited in the wild?

Yes. There are 19 known exploit references for CVE-2013-5211, including 1 documented proof-of-concept exploit on Exploit-DB and 15 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2013-5211?

CVE-2013-5211 has an EPSS (Exploit Prediction Scoring System) score of 92.1%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

When was CVE-2013-5211 published, and has it been updated?

CVE-2013-5211 was published on January 2, 2014 and was last updated on April 16, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2013-5211

Published

Jan 2, 2014

Updated

Apr 16, 2026

Affected

0 pkgs

Patched

None yet

Exploits

19 known

EPSS Exploitation Probability

via FIRST.org ↗

92.1%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

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.

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

EDB-33073doslinux

NTP ntpd monlist Query Reflection - Denial of Service

by Danilo PC · Apr 28, 2014

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2013-5211 in your stack?

O3 detects CVE-2013-5211 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

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