CVE-2015-7704

7.5 HIGH 11% exploit odds Fix listed Denial of service

What it is

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 crafted "KOD" messages.

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 10.7% 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

2017-08-07 20:29 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 00:32 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 10.7% in the next 30 days (EPSS).
Severity: 7.5 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2017-08-07 20:29 UTC
Last modified: 2026-06-17 00:32 UTC
Exploit probability: 10.7% · EPSS, next 30 days
Weakness: CWE-20 · Improper input validation
Record status: Modified

Affected

Ntp < 4.2.8
Ntp < 4.3.77
Ntp 4.2.8
Debian Linux 7.0
Debian Linux 8.0
Debian Linux 9.0
Netapp Oncommand Performance Manager
Netapp Oncommand Unified Manager

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

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

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Fix and advisories

References

NVD record · CVE.org record