CVE-2013-5211

CVE-2013-5211 is a medium-severity vulnerability in Ntp with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 98% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-20.

Key facts

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.

Frequently asked questions

What is 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 amplification) via forged (1) REQ_MON_GETLIST or (2) REQ_MON_GETLIST_1 requests, as exploited in the wild in December 2013.
How severe is CVE-2013-5211?
CVE-2013-5211 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2013-5211 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 98% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-5211?
CVE-2013-5211 primarily affects Ntp. In total, 31 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-5211?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-5211 published?
CVE-2013-5211 was published on 2014-01-02 and last updated on 2026-06-16.

References

Affected products (31)

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Threat intelligence

Threat-intel indicators referencing this CVE: