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CVE-2018-5733

MEDIUM
Published 2019-01-16T20:00:00.000Z
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CVSS Score

V3.0
5.9
/10
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.212
probability
of exploitation in the wild

There is a 21.2% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.954
Higher than 95.4% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Description

A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

ISC

ISC DHCP

Affected Versions:

ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

⚠ Unreviewed HIGH

GHSA-6f7q-j62j-5545

Advisory Details

A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.

CVSS Scoring

CVSS Score

7.5

CVSS Vector

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

References

ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2018-5733
WEB https://access.redhat.com/errata/RHSA-2018:0469
WEB https://access.redhat.com/errata/RHSA-2018:0483
WEB https://kb.isc.org/docs/aa-01567
WEB https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
WEB https://security.netapp.com/advisory/ntap-20250425-0010
WEB https://usn.ubuntu.com/3586-1
WEB https://usn.ubuntu.com/3586-2
WEB https://www.debian.org/security/2018/dsa-4133
WEB http://www.securityfocus.com/bid/103188
WEB http://www.securitytracker.com/id/1040437

Advisory provided by GitHub Security Advisory Database. Published: May 13, 2022, Modified: April 26, 2025

References

https://kb.isc.org/docs/aa-01567
https://access.redhat.com/errata/RHSA-2018:0469
https://www.debian.org/security/2018/dsa-4133
https://usn.ubuntu.com/3586-2/
https://access.redhat.com/errata/RHSA-2018:0483
https://usn.ubuntu.com/3586-1/
http://www.securityfocus.com/bid/103188
http://www.securitytracker.com/id/1040437
https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
Published: 2019-01-16T20:00:00.000Z
Last Modified: 2025-04-25T23:02:52.084Z
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