Skip to main content
View

Vulnerability Assessment

Weakness
CWE
CWE-20
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V2 - Validation and Business Logic Input validation, allowlisting
Impact

CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 31.03%.
Exploit ScenarioDerived

This vulnerability can be exploited remotely over the network. Successful exploitation could compromise the critical-severity affected system.
Emergency Immediate action required. Why: CRITICAL + EPSS > 30%, no patch available.
No patch listed yet 31.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAI

The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted requests. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 31.0% and no vendor patch available.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

This vulnerability is classified under CWE-20. The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted requests. Affected products include: Ntp, Netapp Oncommand Performance Manager, Netapp Oncommand Unified Manager, Netapp Clustered Data Ontap, Netapp Data Ontap. Version information: before 4.2.8.

Know when Ntp gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

NVD PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

DescriptionCVE.org

The rate limiting feature in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to have unspecified impact via a large number of crafted requests.

Threat Intelligence Overview

EPSS Score
31.0%
Top 3% exploitable
Data Quality
3 sources
Confidence: Low
Citrix NVD CVE.org EPSS

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 31.0%
Patch available No
Active threat No
Deciding rule
CRITICAL + EPSS > 30%, no patch available
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

80
Low Medium High Critical
KEV: 0
EPSS: +31
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:*
cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:*
cpe:2.3:a:netapp:oncommand_performance_manager:-:*:*:*:*:*:*:*
+ 9 more

More in Ntp

View all
CVE-2015-7871 CRITICAL POC
9.8 Aug 07

Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authen
CVE-2013-5211 MEDIUM POC
5.0 Jan 02

The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service
CVE-2016-7434 HIGH POC
7.5 Jan 13

The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a craf
CVE-2015-7855 MEDIUM POC
6.5 Aug 07

The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause

CVE-2014-9295 HIGH POC
7.5 Dec 20

Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a
CVE-2016-4957 HIGH
7.5 Jul 05

ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet.

CVE-2014-9294 HIGH POC
7.5 Dec 20

util/ntp-keygen.c in ntp-keygen in NTP before 4.2.7p230 uses a weak RNG seed, which makes it easier for remote attackers
CVE-2014-9293 HIGH POC
7.5 Dec 20

The config_auth function in ntpd in NTP before 4.2.7p11, when an auth key is not configured, improperly generates a key,
CVE-2015-7853 CRITICAL
9.8 Aug 07

The datalen parameter in the refclock driver in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attacker
CVE-2015-7978 HIGH
7.5 Jan 30

NTP before 4.2.8p6 and 4.3.0 before 4.3.90 allows a remote attackers to cause a denial of service (stack exhaustion) via
CVE-2015-5300 HIGH
7.5 Jul 21

The panic_gate check in NTP before 4.2.8p5 is only re-enabled after the first change to the system clock that was greate
CVE-2014-9296 MEDIUM POC
5.0 Dec 20

The receive function in ntp_proto.c in ntpd in NTP before 4.2.8 continues to execute after detecting a certain authentic

Same weakness CWE-20 – Improper Input Validation

View all
CVE-2021-44228 CRITICAL POC
10.0
CVE-2024-3400 CRITICAL POC
10.0
CVE-2022-47966 CRITICAL POC
9.8
CVE-2023-22515 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2017-9791 CRITICAL POC
9.8
CVE-2017-15944 CRITICAL POC
9.8
CVE-2019-0604 CRITICAL POC
9.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

References

Advisories & patches
ADVISORY http://support.ntp.org/bin/view/Main/NtpBug2901 ADVISORY http://support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_4_2_8p4_Securit REF http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html REF http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html REF http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html REF http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html REF http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html REF http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html REF http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html REF http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html REF http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html REF http://lists.opensuse.org/opensuse-updates/2015-11/msg00093.html REF http://lists.opensuse.org/opensuse-updates/2016-05/msg00114.html REF http://packetstormsecurity.com/files/134137/Slackware-Security-Advisory-ntp-Updates.html REF http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-ntp REF http://www.securityfocus.com/archive/1/536737/100/0/threaded REF http://www.securityfocus.com/archive/1/536796/100/0/threaded REF http://www.securityfocus.com/archive/1/archive/1/536737/100/100/threaded REF http://www.securityfocus.com/archive/1/archive/1/536796/100/100/threaded REF http://www.securityfocus.com/bid/77284 REF http://www.securitytracker.com/id/1033951 REF http://www.ubuntu.com/usn/USN-2783-1 REF https://bto.bluecoat.com/security-advisory/sa103 REF https://bugzilla.redhat.com/show_bug.cgi?id=1274184 REF https://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf REF https://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf REF https://eprint.iacr.org/2015/1020.pdf REF https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05270839 REF https://security.gentoo.org/glsa/201607-15 REF https://security.netapp.com/advisory/ntap-20171004-0001/ REF https://support.citrix.com/article/CTX220112 REF https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11 REF https://us-cert.cisa.gov/ics/advisories/icsa-21-159-11 REF https://www.arista.com/en/support/advisories-notices/security-advisories/1212-security-advisory-0016 REF https://www.cs.bu.edu/~goldbe/NTPattack.html REF https://www.kb.cert.org/vuls/id/718152

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy