CVE-2018-5732

A specially constructed response from a malicious server can cause a buffer overflow in dhclient

HIGH

7.5

CVSS Score

Published: October 9, 2019 at 02:17 PM UTC

Updated: June 17, 2026 at 02:00 AM UTC

1 product affected across 1 vendorDHCP

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Severity

HIGH7.5

Exploit prediction

EPSS 5%

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

DHCP · Isc

95%

Affected range stops below 4.2.8, so it looks safe — our inference, not a vendor statement

Affected range stops below 4.3.6, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://kb.isc.org/docs/aa-01565

References (1)

x_refsource_CONFIRMVendor Advisory

Source: [email protected]

https://kb.isc.org/docs/aa-01565

CVSS

7.5HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: NONE
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-119

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