CVE-2016-7429

NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cause a denial of service (prevent communication with a source) by sending a response for a source to an interface the source does not use.

Published: 2017-01-13 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-7429 is rated Moderate Risk (49.8/100): CVSS Low severity, with high exploitation likelihood (EPSS 7.42%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.21% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-7429

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 5.21% 7.42% +2.21%
2 2026-01-18 24.15% 5.21% -18.94%
3 2025-12-28 — 24.15% —

Full EPSS history (19 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-7429

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
3.7 3.0 LOW
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.2 1.4 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2016-7429

OS Trackers for CVE-2016-7429

vendor priority summary link
debian not yet assigned CVE-2016-7429 not yet assigned priority: Debian including 1 source packages (ntp), 1 status rows across 1 suites (bullseye): resolved 1. https://security-tracker.debian.org/tracker/CVE-2016-7429
redhat low — https://access.redhat.com/security/cve/CVE-2016-7429
suse low CVE-2016-7429 severity low: SUSE including 27 source package names (ntp-4.2.6p5-25.el7_3.1, ntp-4.2.8p10-63.3, …), 87 product×package rows across 56 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (56 product lines)): Fixed 87. https://www.suse.com/security/cve/CVE-2016-7429/
ubuntu low CVE-2016-7429 low priority: Ubuntu including 1 source packages (ntp), 6 status rows across 6 suites (precise, trusty, upstream, xenial, yakkety, zesty): released 4, not-affected 2. https://ubuntu.com/security/CVE-2016-7429

Affected software / configurations for CVE-2016-7429

Vendor Product Version Raw CPE
ntp ntp <= 4.2.8 cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:*

References for CVE-2016-7429

cvelogic Threat Intelligence