CVE-2018-5733

high-risk
Published 2019-01-16

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.

Do I need to act?

!
11.3% chance of exploitation in next 30 days
EPSS score — higher than 89% of all CVEs
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10 High
NETWORK / LOW complexity

Affected Products (20)

Affected Vendors

Debian Redhat Isc Canonical

References (19)

Third Party Advisory http://www.securityfocus.com/bid/103188
Third Party Advisory http://www.securitytracker.com/id/1040437
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0469
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0483
Vendor Advisory https://kb.isc.org/docs/aa-01567
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
Third 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-4133
Third Party Advisory http://www.securityfocus.com/bid/103188
Third Party Advisory http://www.securitytracker.com/id/1040437
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0469
Third Party Advisory https://access.redhat.com/errata/RHSA-2018:0483
Vendor Advisory https://kb.isc.org/docs/aa-01567
Third Party Advisory https://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
https://security.netapp.com/advisory/ntap-20250425-0010/
Third 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-4133
63
/ 100
high-risk
Severity 26/34 · High
Exploitability 11/34 · Low
Exposure 26/34 · High