CVE-2018-5733

HIGHScheduled

Published:Jan 16, 2019(7 years ago)

Modified:Apr 25, 2025

Remote ExploitNo Auth RequiredNo InteractionLow Complexity

Vulnerability 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.

Attack Characteristics

Network AccessLow ComplexityNo Auth NeededNo User Interaction

🤖

AI analysis not yet available

Plain-English explanation, risk summary, and remediation steps will appear here once AI analysis is complete.

No Fix Known

No patch has been released yet. Apply workarounds or mitigations where available.

Affected Software

Vendor	Product	Versions	Fixed In
isc	dhcp	4.2.0 - 4.2.8	-
isc	dhcp	4.3.0 - 4.3.6	-
isc	dhcp	-

Timeline

Published
CVE disclosed publicly
Jan 16, 20197 years ago
Last Modified
Most recent update
Apr 25, 20251 year ago
Indexed to CVEInsight
Added to this platform
Mar 29, 20261 month ago

References

http://www.securityfocus.com/bid/103188Third Party Advisory
http://www.securitytracker.com/id/1040437Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:0469Third Party Advisory

CVSS Score

v3.1

7.5/ 10.0

HIGH

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

At a Glance

Affected Products

References

isc / dhcp +54 more

https://access.redhat.com/errata/RHSA-2018:0483Third Party Advisory

https://kb.isc.org/docs/aa-01567Vendor Advisory

https://lists.debian.org/debian-lts-announce/2018/03/msg00015.htmlThird Party Advisory

https://usn.ubuntu.com/3586-1/Third Party Advisory

https://usn.ubuntu.com/3586-2/Third Party Advisory

https://www.debian.org/security/2018/dsa-4133Third Party Advisory

http://www.securityfocus.com/bid/103188Third Party Advisory

http://www.securitytracker.com/id/1040437Third Party Advisory

https://access.redhat.com/errata/RHSA-2018:0469Third Party Advisory

https://access.redhat.com/errata/RHSA-2018:0483Third Party Advisory

https://kb.isc.org/docs/aa-01567Vendor Advisory

https://lists.debian.org/debian-lts-announce/2018/03/msg00015.htmlThird Party Advisory

https://security.netapp.com/advisory/ntap-20250425-0010/

https://usn.ubuntu.com/3586-1/Third Party Advisory

https://usn.ubuntu.com/3586-2/Third Party Advisory

https://www.debian.org/security/2018/dsa-4133Third Party Advisory

CVSS v3 Vector

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

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

Impact

ScopeUnchanged

ConfidentialityNone

IntegrityNone

AvailabilityHigh

Impact Analysis

ConfidentialityNone

NoneLowHigh

IntegrityNone

NoneLowHigh

AvailabilityHigh

NoneLowHigh

CVE-2018-5733

✦ Vulnerability Description

Attack Characteristics

Affected Software

Timeline

References

CVSS Score

At a Glance

Official Sources

CVSS v3 Vector

Impact Analysis

Vulnerability Description