CVE-2018-5732

Name: CVE-2018-5732
Creator: NVD / NIST
Published: 2019-10-09T16:15:13.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 4.96%

Last modified Jun 17, 2026

CVE-2018-5732 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 4.96% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

4.96%

91.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions	Update
Isc	Dhcp	>= 4.1.0, <= 4.1.2	—
Isc	Dhcp	>= 4.2.0, < 4.2.8	—
Isc	Dhcp	>= 4.3.0, < 4.3.6	—
Isc	Dhcp	4.1-esv	—
Isc	Dhcp	4.1.2	P1
Isc	Dhcp	4.4.0	—

References

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

Timeline

Published: Oct 9, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-5732?

How severe is CVE-2018-5732?

CVE-2018-5732 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 4.96% probability of exploitation in the next 30 days.

How do I fix CVE-2018-5732?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-5732?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST