CVE-2018-7170

What it is

ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.

At a glance

Exploitability

Can be exploited over the network with a low-privilege account. High risk of data tampering.

Exploit odds

2.7% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2018-03-06 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:02 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.7% in the next 30 days (EPSS).
• Severity: 5.3 MEDIUM (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2018-03-06 20:29 UTC

Last modified

2026-06-17 02:02 UTC

Exploit probability

2.7% · EPSS, next 30 days

Record status

Modified

Affected

• Ntp < 4.2.8
• Ntp < 4.3.92
• Ntp 4.2.8
• Synology Router Manager < 1.1.6-6931-3
• Synology Skynas < 6.1.5-15254
• Synology Virtual Diskstation Manager < 6.1.6-15266
• Synology Diskstation Manager < 6.1.6-15266
• Synology vs960hd Firmware < 2.2.3-1505

Attack profile CVSS 3.1 · 5.3

Attack vector

Network

Complexity

High

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

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-2018-7170.md and follow it. Check whether this project is affected by CVE-2018-7170. 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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