VulnerabilityModified
CVE-2018-5733
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.
HIGH 7.5EPSS 20.2%
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 20.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 20.24% probability · 97th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-190
- Affected
- isc/dhcp · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux workstation · canonical/ubuntu linux · debian/debian linux
- Source
- security-officer@isc.org
References
- http://www.securityfocus.com/bid/103188Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1040437Third Party Advisory, VDB Entry
- 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://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, VDB Entry
- http://www.securitytracker.com/id/1040437Third Party Advisory, VDB Entry
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.