No exploitation reportedFix available

CVE-2017-6458

Q: Is CVE-2017-6458 actively exploited?

Active exploitation of CVE-2017-6458 has not been confirmed. Its EPSS score was 6.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2017-6458?

CVE-2017-6458 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2017-03-27
Fixed in4.3.94 · 4.2.8
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Multiple buffer overflows in the ctl_put* functions in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allow remote authenticated users to have unspecified impact via a long variable.

Timeline

dates in UTC

2017-03-2717:59CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6458?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6458?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ntp

Branch	Affected	Fixed in	Source
4.3	≥ 4.3.0, < 4.3.94	4.3.94	NVD
4.2	< 4.2.8	4.2.8	NVD
4.2	= 4.2.8	no fix published	NVD

Apple mac os x

Branch	Affected	Fixed in	Source
10.x	≥ 10.8.0, < 10.13	10.13	NVD

Hpe hpux-ntp

Branch	Affected	Fixed in	Source
—	< c.4.2.8.4.0	c.4.2.8.4.0	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Ntp to 4.3.94 · 4.2.8

Advisories and patches

support.ntp.orgPatch · Vendor Advisory
support.ntp.orgVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.18.8read 2026-10-23
NVDCVSS 2.06.5read 2026-10-23
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score6.5 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2017-03-27
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-6458?

Multiple buffer overflows in the ctl_put* functions in NTP before 4.2.8p10 and 4.3.x before 4.3.94 allow remote authenticated users to have unspecified impact via a long variable.

Is CVE-2017-6458 actively exploited?

Active exploitation of CVE-2017-6458 has not been confirmed. Its EPSS score was 6.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-6458?

CVE-2017-6458 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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