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CVE-2015-8158

19
FAUCET Score

CVE-2015-8158 describes a denial-of-service vulnerability affecting the ntpq utility in NTP versions prior to 4.2.8p9 and 4.3.x before 4.3.90. Remote attackers can exploit this flaw by sending crafted packets with incorrect values, leading to an infinite loop. This vulnerability has a CVSS v3.0 score of 5.9 (Medium), indicating a network-based attack with high impact on availability and high attack complexity, requiring no user interaction or privileges. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:p5:*:*:*:*:*:*
4.3.0CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.0:*:*:*:*:*:*:*
4.3.1CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.1:*:*:*:*:*:*:*
4.3.2CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.2:*:*:*:*:*:*:*
4.3.3CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.3.3:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
7.55%
Probability of exploitation in next 30 days
EPSS Percentile
93.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0755 is in the 93rd percentile among its peer group of 19,958 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-25.el7
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2015-8158Low

ntp: potential infinite loop in ntpq

Jan 20, 2016

References

rhn.redhat.com / errata/RHSA-2016-2583.html
h20566.www2.hpe.com / hpsc/doc/public/display
h20566.www2.hpe.com / hpsc/doc/public/display
security.freebsd.org / advisories/FreeBSD-SA-16:09.ntp.asc
security.gentoo.org / glsa/201607-15
security.netapp.com / advisory/ntap-20171031-0001
support.ntp.org / bin/view/Main/NtpBug2948
Vendor Advisory
kb.cert.org / vuls/id/718152
Third Party AdvisoryUS Government Resource
debian.org / security/2016/dsa-3629
securityfocus.com / bid/81814
Third Party AdvisoryVDB Entry
securitytracker.com / id/1034782