How severe is CVE-2018-5732?

CVE-2018-5732 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-5732 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-5732?

CVE-2018-5732 primarily affects Isc Dhcp. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-5732?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2018-5732 published?

CVE-2018-5732 was published on 2019-10-09 and last updated on 2026-06-17.

CVE-2018-5732

CVE-2018-5732 is a high-severity vulnerability in Isc Dhcp with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Isc Dhcp
Published: 2019-10-09
Last modified: 2026-06-17

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

Frequently asked questions

What is CVE-2018-5732?: 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
How severe is CVE-2018-5732?: CVE-2018-5732 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-5732 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-5732?: CVE-2018-5732 primarily affects Isc Dhcp. In total, 36 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-5732?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-5732 published?: CVE-2018-5732 was published on 2019-10-09 and last updated on 2026-06-17.

References

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

Affected products (36)

cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r10b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r10rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r11rc2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r12-p1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r12b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r13:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r13b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r14:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r14b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r15:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r3:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r3b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r4:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r5:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r5b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r5rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r5rc2:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r6:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r7:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r8:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r8b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r8rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r9:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r9b1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1-esv:r9rc1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.1.2:p1:*:*:*:*:*:*
cpe:2.3:a:isc:dhcp:4.4.0:*:*:*:*:*:*:*

More vulnerabilities in Isc Dhcp

CVE-2009-0692 — Critical (CVSS 10.0): Stack-based buffer overflow in the script_write_params method in client/dhclient.c in ISC DHCP dhclient 4.1 before…
CVE-2011-2749 — High (CVSS 7.8): The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before 3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote…
CVE-2011-2748 — High (CVSS 7.8): The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before 3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote…
CVE-2011-0413 — High (CVSS 7.8): The DHCPv6 server in ISC DHCP 4.0.x and 4.1.x before 4.1.2-P1, 4.0-ESV and 4.1-ESV before 4.1-ESV-R1, and 4.2.x before…
CVE-2018-5733 — High (CVSS 7.5): A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can…
CVE-2017-3144 — High (CVSS 7.5): A vulnerability stemming from failure to properly clean up closed OMAPI connections can lead to exhaustion of the pool…

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