CVE-2016-2519

CVE-2016-2519 is a medium-severity vulnerability in Ntp with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

• Severity: Medium (CVSS 3.x base score 5.9)
• CVSS v2: 4.9
• EPSS exploit prediction: 7% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Ntp
• Published: 2017-01-30
• Last modified: 2026-06-17

Description

ntpd in NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (ntpd abort) by a large request data value, which triggers the ctl_getitem function to return a NULL value.

Frequently asked questions

What is CVE-2016-2519?

ntpd in NTP before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (ntpd abort) by a large request data value, which triggers the ctl_getitem function to return a NULL value.

How severe is CVE-2016-2519?

CVE-2016-2519 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2016-2519 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-2519?

CVE-2016-2519 primarily affects Ntp. In total, 93 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-2519?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2016-2519 published?

CVE-2016-2519 was published on 2017-01-30 and last updated on 2026-06-17.

References

• http://support.ntp.org/bin/view/Main/NtpBug3008
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
• http://www.securityfocus.com/bid/88204
• http://www.securitytracker.com/id/1035705
• https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
• https://security.gentoo.org/glsa/201607-15
• https://security.netapp.com/advisory/ntap-20171004-0002/
• https://www.kb.cert.org/vuls/id/718152

Affected products (93)

• cpe:2.3:a:ntp:ntp:*:p6:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.0:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.1:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.2:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.3:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.4:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.5:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.6:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.7:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.8:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.9:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.10:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.11:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.12:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.13:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.14:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.15:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.16:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.17:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.18:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.19:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.20:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.21:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.22:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.23:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.24:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.25:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.26:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.27:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.28:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.29:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.30:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.31:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.32:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.33:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.34:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.35:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.36:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.37:*:*:*:*:*:*:*
• cpe:2.3:a:ntp:ntp:4.3.38:*:*:*:*:*:*:*

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All CVEs affecting Ntp →

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• CVE-2026-96257 — Critical (CVSS 10.0): A flaw has been found in Fast FAC1203R Gigabit Edition 2.0.4. Affected by this issue is the function copy_msg_element…
• CVE-2026-94089 — Critical (CVSS 10.0): A vulnerability was determined in D-Link DIR-868L 2.01b05. This issue affects the function strcpy of the file…
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Browse all CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) vulnerabilities →

Threat intelligence

Threat-intel indicators referencing this CVE:

• 197.248.207.139 (ipv4-addr)
• 135.129.128.247 (ipv4-addr)
• 119.201.59.224 (ipv4-addr)
• 125.212.244.35 (ipv4-addr)
• 186.182.105.49 (ipv4-addr)
• 202.29.220.126 (ipv4-addr)
• 93.42.227.251 (ipv4-addr)
• 82.209.191.11 (ipv4-addr)