CVE-2015-7705: 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…
Noroxi assessment
Priority: Plan (action score 43/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 12.1% (FIRST EPSS); higher than 96.2% of all records.
- 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.
- Fixed version: ntp (Debian:11) 1:4.2.8p4+dfsg-3; ntp (openSUSE:Tumbleweed) 4.2.8p9-1.1; ntp (SUSE:Linux Enterprise Desktop 11 SP4) 4.2.8p4-5.1.
Add it to your regular patch cycle. Upgrade to ntp (Debian:11) 1:4.2.8p4+dfsg-3; ntp (openSUSE:Tumbleweed) 4.2.8p9-1.1; ntp (SUSE:Linux Enterprise Desktop 11 SP4) 4.2.8p4-5.1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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
- 12.1% · 96th percentile
- CWE
- CWE-20
Report tools
Action score
43
Add it to your regular patch cycle.
- CVSS
- 39 / 40 · 9.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 4 / 30 · 12.1%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| 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
+5 more rows
- 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 4.2.8p7-44.1 | 4.2.8p7-44.1 |
| SUSE:OpenStack Cloud 5 | ntp | before 4.2.8p6-41.1 | 4.2.8p6-41.1 |
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…54Plan
- 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…49Plan
Published before and after this one in the same product
- ← EarlierCVE-2015-7702Aug 7, 2017 · The crypto_xmit 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 a denial of service…28Monitor
- ← EarlierCVE-2015-7704Aug 7, 2017 · The ntpd client in NTP 4.x before 4.2.8p4 and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service via a number of…33Monitor
- Later →CVE-2015-7849Aug 7, 2017 · Use-after-free vulnerability in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote authenticated users to possibly…40Plan
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.
Bug bounty scope
The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate.
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
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (19 more)Show less
- 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
- 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
- www.securitytracker.com/id/1033951
Vendor advisories and official records. Exploit/PoC links are deliberately left out.