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CVE-2018-12327

57
FAUCET Score

CVE-2018-12327 is a critical stack-based buffer overflow vulnerability affecting ntpq and ntpdc components of NTP version 4.2.8p11. An attacker can exploit this by providing a long string as an IPv4 or IPv6 command-line argument, potentially leading to remote code execution or privilege escalation. With a CVSS score of 9.8 (CRITICAL) and a FAUCET Risk Score of 96/100, this vulnerability has a high impact on confidentiality, integrity, and availability, requiring no user interaction or authentication. While not listed on CISA's KEV catalog, a Proof-of-Concept exploit is publicly available on ExploitDB, though there is no evidence of active exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p11:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
29.04%
Probability of exploitation in next 30 days
EPSS Percentile
98.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
ExploitDB: EDB-44909 · Jun 20, 2018
This CVE's current EPSS score of 0.2904 is in the 95th percentile among its peer group of 36,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (5)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-15.el6_10
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6.7 Extended Update SupportFixed in: ntp-0:4.2.6p5-5.el6_7.6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-29.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7.6 Extended Update SupportFixed in: ntp-0:4.2.6p5-28.el7_6.1
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: ntp

Vendor Advisories (1)

redhatCVE-2018-12327Low

ntp: Stack-based buffer overflow in ntpq and ntpdc allows denial of service or code execution

Jun 20, 2018

References

access.redhat.com / errata/RHSA-2018:3853
access.redhat.com / errata/RHSA-2018:3854
access.redhat.com / errata/RHSA-2019:2077
gist.github.com / fakhrizulkifli/9b58ed8e0354e8deee50b0eebd1c011f
ExploitThird Party Advisory
security.gentoo.org / glsa/201903-15
support.hpe.com / hpsc/doc/public/display
usn.ubuntu.com / 4229-1
exploit-db.com / exploits/44909
ExploitThird Party AdvisoryVDB Entry
securityfocus.com / bid/104517
Third Party AdvisoryVDB Entry