CVE-2016-7426

What it is

NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

12.4% chance of exploitation in the next 30 days (EPSS). Higher than most.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-01-13 16:59 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 00:53 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 12.4% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-01-13 16:59 UTC

Last modified

2026-06-17 00:53 UTC

Exploit probability

12.4% · EPSS, next 30 days

Weakness

CWE-400 · Uncontrolled resource consumption

Record status

Modified

Affected

• Ntp < 4.2.8
• Ntp < 4.3.94
• Ntp 4.2.5
• Ntp 4.2.8
• Canonical Ubuntu Linux 12.04
• Redhat Enterprise Linux Desktop 6.0
• Redhat Enterprise Linux Desktop 7.0
• Redhat Enterprise Linux Server 6.0

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2016-7426.md and follow it. Check whether this project is affected by CVE-2016-7426. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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