CVE-2018-5732

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 5.2% (92nd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.2%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP versions 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
40
EG Risk 40/100CISA SSVC

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
Severity75% × 45%
Exploitation5% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
5.2%
EPSS %ILE
92nd
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

October 9, 2019

Last Modified

November 21, 2024

References (2)

Vendor Advisories for CVE-2018-5732(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuisc-dhcp-server-ldap (4.1.ESV-R4-0ubuntu5.13) @ precise2026-05-27ubuntu
ubuntuisc-dhcp-server-ldap (4.3.3-5ubuntu12.9) @ xenial2026-05-27ubuntu
redhatdhcp-12:4.2.5-58.el7_4.32018-03-12redhat
redhatdhcp-12:4.1.1-53.P1.el6_9.32018-03-09redhat

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.

Affected Packages

(17 across 17 ecosystems)
Alpine:v3.10(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.11(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
dhcp—
  • 4.1.0 up to 4.4.1-r0: fixed in 4.4.1-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp—
  • every version up to 4.3.5-3.1: fixed in 4.3.5-3.1
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp—
  • every version up to 4.3.5-3.1: fixed in 4.3.5-3.1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp—
  • every version up to 4.3.5-3.1: fixed in 4.3.5-3.1
—
Debian:7(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp4.2.2.dfsg.1-5+deb70u3 ... 4.2.2.dfsg.1-5+deb70u8 (6 versions)
  • every version up to 4.2.2.dfsg.1-5+deb70u9: fixed in 4.2.2.dfsg.1-5+deb70u9
—
Debian:8(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp4.3.1-6, 4.3.1-6+deb8u1, 4.3.1-6+deb8u2, 4.3.1-6+deb8u2+kbsd8u1
  • every version up to 4.3.1-6+deb8u3: fixed in 4.3.1-6+deb8u3
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
isc-dhcp4.3.5-3
  • every version up to 4.3.5-3+deb9u1: fixed in 4.3.5-3+deb9u1
—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 7× in last 7d / 24× 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.

Showing the most recent 100 of 160 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:21 UTCEPSS rescore
  4. 2026-10-01 19:44 UTCEPSS rescore
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  6. 2026-09-30 10:03 UTCEG score recompute
  7. 2026-09-29 15:12 UTCEPSS rescore
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  9. 2026-09-27 18:00 UTCOSV refresh
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  23. 2026-09-08 02:52 UTCOSV refresh
  24. 2026-09-06 13:44 UTCEPSS rescore
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  1. 2026-09-04 05:02 UTCEPSS rescore
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  11. 2026-08-21 23:45 UTCEPSS rescore
  12. 2026-08-21 13:14 UTCOSV refresh
  13. 2026-08-20 22:51 UTCEPSS rescore
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  25. 2026-08-06 13:42 UTCEPSS rescore
  26. 2026-08-06 00:21 UTCOSV refresh
  27. 2026-08-04 15:05 UTCEPSS rescore
  28. 2026-08-04 10:33 UTCEPSS rescore
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  40. 2026-07-23 14:15 UTCEPSS rescore
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  42. 2026-07-23 01:36 UTCEG score recompute
  43. 2026-07-22 22:17 UTCEG score recompute
  44. 2026-07-22 14:05 UTCEPSS rescore
  45. 2026-07-21 15:22 UTCEPSS rescore
  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-20 17:04 UTCEPSS rescore
  48. 2026-07-20 04:16 UTCOSV refresh
  49. 2026-07-19 14:28 UTCEPSS rescore
  50. 2026-07-19 14:28 UTCEPSS rescore
  51. 2026-07-19 02:26 UTCEPSS rescore
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  70. 2026-07-02 19:35 UTCOSV refresh
  71. 2026-07-01 15:03 UTCEPSS rescore
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  73. 2026-06-30 23:20 UTCEPSS rescore
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  75. 2026-06-28 14:04 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2018-5732?
CVE-2018-5732 is a high vulnerability published on October 9, 2019. Failure to properly bounds-check a buffer used for processing DHCP options allows a malicious server (or an entity masquerading as a server) to cause a buffer overflow (and resulting crash) in dhclient by sending a response containing a specially constructed options section. Affects ISC DHCP…
When was CVE-2018-5732 disclosed?
CVE-2018-5732 was first published on October 9, 2019, 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-2018-5732 actively exploited?
CVE-2018-5732 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.2% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2018-5732?
CVE-2018-5732 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2018-5732?
A fix for CVE-2018-5732 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2018-5732 are linked in the Vendor Advisories panel on this page.

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