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 n
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.
- Published
- Aug 7, 2017
- Updated
- Jun 16, 2026
- EPSS
- 12.4% · 96th percentile
- CWE
- CWE-20
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Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 12.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| ntp | ntp | cpe:2.3:a:ntp:ntp |
| netapp | oncommand performance manager | cpe:2.3:a:netapp:oncommand_performance_manager |
| netapp | oncommand unified manager | cpe:2.3:a:netapp:oncommand_unified_manager |
| netapp | clustered data ontap | cpe:2.3:o:netapp:clustered_data_ontap |
| netapp | data ontap | cpe:2.3:o:netapp:data_ontap |
| citrix | xenserver | cpe:2.3:a:citrix:xenserver |
| siemens | tim 4r-ie firmware | cpe:2.3:o:siemens:tim_4r-ie_firmware |
| siemens | tim 4r-ie | cpe:2.3:h:siemens:tim_4r-ie |
| siemens | tim 4r-ie dnp3 firmware | cpe:2.3:o:siemens:tim_4r-ie_dnp3_firmware |
| siemens | tim 4r-ie dnp3 | cpe:2.3:h:siemens:tim_4r-ie_dnp3 |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- citrix xenserver6.0.2
- citrix xenserver6.2.0
- citrix xenserver6.5
- citrix xenserver7.0
- netapp clustered data ontapall versions
- netapp data ontapall versions
- netapp oncommand performance managerall versions
- netapp oncommand unified managerall versions
- ntp ntp4.2.0 and later · before 4.2.8
- ntp ntp4.3.0 and later · before 4.3.77
- ntp ntp4.2.8
- siemens tim 4r-ie dnp3 firmwareall versions
- siemens tim 4r-ie firmwareall versions
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:11 | ntp | before 1:4.2.8p4+dfsg-3 | 1:4.2.8p4+dfsg-3 |
| openSUSE:Tumbleweed | ntp | before 4.2.8p9-1.1 | 4.2.8p9-1.1 |
| SUSE:Linux Enterprise Desktop 11 SP4 | ntp | before 4.2.8p4-5.1 | 4.2.8p4-5.1 |
| SUSE:Linux Enterprise Desktop 12 | ntp | before 4.2.8p6-46.5.2 | 4.2.8p6-46.5.2 |
| SUSE:Linux Enterprise Desktop 12 | ntp | before 4.2.8p8-46.8.1 | 4.2.8p8-46.8.1 |
| SUSE:Linux Enterprise Desktop 12 | yast2-ntp-client | before 3.1.12.4-8.2 | 3.1.12.4-8.2 |
| SUSE:Linux Enterprise Server 11 SP2-LTSS | yast2-ntp-client | before 2.17.14.1-1.12.1 | 2.17.14.1-1.12.1 |
| SUSE:Linux Enterprise Server 11 SP4 | ntp | before 4.2.8p7-11.1 | 4.2.8p7-11.1 |
| SUSE:OpenStack Cloud 5 | ntp | before 4.2.8p6-41.1 | 4.2.8p6-41.1 |
| SUSE:OpenStack Cloud 5 | ntp | before 4.2.8p7-44.1 | 4.2.8p7-44.1 |
Same product
ntp: all recordsOther highest-scoring records for the same primary product.
- CVE-2015-7871Crypto-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 authentication.64This week
- CVE-2014-9295Multiple stack-based buffer overflows in ntpd in NTP before 4.2.8 allow remote attackers to execute arbitrary code via a crafted packet, rel54Plan
- CVE-2013-5211The monlist feature in ntp_request.c in ntpd in NTP before 4.2.7p26 allows remote attackers to cause a denial of service (traffic amplificat49Plan
- CVE-2018-12327Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher pri47Plan
- CVE-2016-7434The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.46Plan
- CVE-2015-7853The 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 attackers to execute arbitra43Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:ntp | 1:4.2.8p4+dfsg-3 · Debian:11 | Package registry (OSV) |
| opensuse:ntp | 4.2.8p9-1.1 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:ntp | 4.2.8p4-5.1 · SUSE:Linux Enterprise Desktop 11 SP4 | Package registry (OSV) |
| suse:yast2-ntp-client | 3.1.12.4-8.2 · SUSE:Linux Enterprise Desktop 12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
CWE-20 · Improper Input ValidationCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00020.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00034.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00037.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00048.html
- lists.opensuse.org/opensuse-security-announce/2016-05/msg00052.html
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00001.html
- lists.opensuse.org/opensuse-security-announce/2016-06/msg00020.html
- lists.opensuse.org/opensuse-security-announce/2016-07/msg00026.html
- lists.opensuse.org/opensuse-security-announce/2016-08/msg00042.html
- lists.opensuse.org/opensuse-updates/2015-11/msg00093.html
- lists.opensuse.org/opensuse-updates/2016-05/msg00114.html
- packetstormsecurity.com/files/134137/Slackware-Security-Advisory-ntp-Updates.html
- support.ntp.org/bin/view/Main/NtpBug2901
- support.ntp.org/bin/view/Main/SecurityNotice#October_2015_NTP_4_2_8p4_Securit
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151021-ntp
- www.securityfocus.com/archive/1/536737/100/0/threaded
- www.securityfocus.com/archive/1/536796/100/0/threaded
- www.securityfocus.com/archive/1/archive/1/536737/100/100/threaded
- www.securityfocus.com/archive/1/archive/1/536796/100/100/threaded
- www.securityfocus.com/bid/77284
Vendor advisories and official records. Exploit/PoC links are deliberately left out.