CVE-2018-12327

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 29%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher privileges via a long string as the argument for an IPv4 or IPv6 command-line parameter. NOTE: It is unclear whether there are any common situations in which ntpq or ntpdc is used with a command line from an untrusted source.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
65(Track*)
EG Risk 65/100SSVC: Track*

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Watch closely — could escalate to Attend.
EPSS
98.0%
KEV
Not listed

Published

June 20, 2018

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated May 28, 2026
🔬 Proof of concept available. Patch available. Sources: redhat.
generic
http://www.securityfocus.com/bid/104517
generic
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
generic

NTP: Multiple vulnerabilities (GLSA 201903-15) — Gentoo security

https://security.gentoo.org/glsa/201903-15
generic

CVE-2018-12327 · GitHub

https://gist.github.com/fakhrizulkifli/9b58ed8e0354e8deee50b0eebd1c011f
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:2077
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.

https://access.redhat.com/errata/RHSA-2018:3854
redhat Patch Available

Affected: Red Hat Enterprise Linux 6.7 Extended Update Support.

https://access.redhat.com/errata/RHSA-2018:3853

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuntpdate (1:4.2.8p10+dfsg-5ubuntu7.3+esm1) @ bionic2026-05-28ubuntu
ubuntuntpdate (1:4.2.8p4+dfsg-3ubuntu5.10) @ xenial2026-05-28ubuntu
redhatntp-0:4.2.6p5-28.el7_6.12020-04-14redhat
redhatntp-0:4.2.6p5-29.el72019-08-06redhat
redhatntp-0:4.2.6p5-15.el6_102018-12-19redhat
redhatntp-0:4.2.6p5-5.el6_7.62018-12-19redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(6)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 37× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 14:15 UTCEPSS rescore
  3. 2026-07-23 01:32 UTCEG score recompute
  4. 2026-07-22 22:13 UTCEG score recompute
  5. 2026-07-22 14:04 UTCEPSS rescore
  6. 2026-07-21 15:21 UTCEPSS rescore
  7. 2026-07-21 10:47 UTCOSV refresh
  8. 2026-07-20 17:04 UTCEPSS rescore
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  10. 2026-07-19 14:28 UTCEPSS rescore
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  1. 2026-07-04 05:56 UTCOSV refresh
  2. 2026-07-02 16:54 UTCEPSS rescore
  3. 2026-07-01 15:03 UTCEPSS rescore
  4. 2026-07-01 15:03 UTCEPSS rescore
  5. 2026-06-29 14:03 UTCEPSS rescore
  6. 2026-06-28 04:53 UTCEPSS rescore
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  8. 2026-06-27 03:06 UTCEPSS rescore
  9. 2026-06-25 13:47 UTCEPSS rescore
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  11. 2026-06-24 14:02 UTCEPSS rescore
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  13. 2026-06-23 21:30 UTCEPSS rescore
  14. 2026-06-21 01:57 UTCEPSS rescore
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  16. 2026-06-18 17:50 UTCEPSS rescore
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  18. 2026-06-17 17:50 UTCEPSS rescore
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  22. 2026-06-15 17:45 UTCEPSS rescore
  23. 2026-06-15 17:43 UTCOSV refresh
  24. 2026-06-14 23:14 UTCEPSS rescore
  25. 2026-06-14 23:14 UTCEPSS rescore
  26. 2026-06-13 22:58 UTCEPSS rescore
  27. 2026-06-13 22:58 UTCEPSS rescore
  28. 2026-06-12 23:09 UTCEPSS rescore
  29. 2026-06-11 13:57 UTCEPSS rescore
  30. 2026-06-10 22:16 UTCEPSS rescore
  31. 2026-06-10 13:19 UTCEPSS rescore
  32. 2026-06-08 14:14 UTCEPSS rescore
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  34. 2026-06-07 15:22 UTCEPSS rescore
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  36. 2026-06-05 22:45 UTCEPSS rescore
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  40. 2026-06-04 13:10 UTCEPSS rescore
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  42. 2026-06-02 20:11 UTCEPSS rescore
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  44. 2026-06-01 13:49 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 22:28 UTCEPSS rescore
  47. 2026-05-31 00:14 UTCEPSS rescore
  48. 2026-05-31 00:14 UTCEPSS rescore
  49. 2026-05-29 13:41 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-28 06:28 UTCEG score recompute
  53. 2026-05-28 06:28 UTCVendor advisory
  54. 2026-05-28 06:28 UTCGHSA enrichment
  55. 2026-05-27 13:38 UTCEPSS rescore
  56. 2026-05-27 13:38 UTCEPSS rescore
  57. 2026-05-26 13:42 UTCEPSS rescore
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  59. 2026-05-26 07:17 UTCEPSS rescore
  60. 2026-05-26 07:17 UTCEPSS rescore
  61. 2026-05-24 06:06 UTCOSV refresh

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-44909
    First seen Jun 20, 2018

    ntp 4.2.8p11 - Local Buffer Overflow (PoC)

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2018-12327?
CVE-2018-12327 is a critical vulnerability published on June 20, 2018. Stack-based buffer overflow in ntpq and ntpdc of NTP version 4.2.8p11 allows an attacker to achieve code execution or escalate to higher privileges via a long string as the argument for an IPv4 or IPv6 command-line parameter. NOTE: It is unclear whether there are any common situations in which ntpq…
When was CVE-2018-12327 disclosed?
CVE-2018-12327 was first published in the National Vulnerability Database on June 20, 2018, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-12327 actively exploited?
CVE-2018-12327 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-12327?
CVE-2018-12327 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-12327?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-12327, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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