High severity7.5NVD Advisory· Published Jan 16, 2019· Updated Jun 17, 2026

CVE-2018-5733

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Isc/DHCP39 versions
cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*+ 38 more
- cpe:2.3:a:isc:dhcp:*:*:*:*:*:*:*:*range: >=4.2.0,<=4.2.8
- cpe:2.3:a:isc:dhcp:4.1-esv:-:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r10:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r10_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r10_rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r11:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r11_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r11_rc2:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r12:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r12_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r12_p1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r13:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r13_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r14:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r14_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r15:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r1:*:*:*:*:*:*
- 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:r3_b1:*:*:*:*:*:*
- 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:r5_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r5_rc2:*:*:*:*:*:*
- 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:r8_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r8_rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r9:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r9_b1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:r9_rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1-esv:rc1:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.1.0:-:*:*:*:*:*:*
- cpe:2.3:a:isc:dhcp:4.4.0:*:*:*:*:*:*:*
- (no CPE)range: 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
- (no CPE)range: ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0
Canonical/Ubuntu Linux3 versions
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*+ 2 more
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
Debian/linux3 versions
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Desktop2 versions
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server2 versions
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Server Aus2 versions
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Eus3 versions
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
Red Hat/Enterprise Linux Workstation2 versions
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
osv-coords16 versions
pkg:rpm/opensuse/dhcp&distro=openSUSE%20Tumbleweed pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP2 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Desktop%2012%20SP3 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Point%20of%20Sale%2011%20SP3 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-LTSS pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP3-TERADATA pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20Raspberry%20Pi%2012%20SP2 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2011%20SP4 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2011%20SP4 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP2 pkg:rpm/suse/dhcp&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP3
< 4.4.2.P1-2.4+ 15 more
- (no CPE)range: < 4.4.2.P1-2.4
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.2.4.P2-0.28.8.1
- (no CPE)range: < 4.3.3-10.14.1
- (no CPE)range: < 4.3.3-10.14.1

Patches

Vulnerability mechanics

References

www.securityfocus.com/bid/103188nvdThird Party AdvisoryVDB Entry
www.securitytracker.com/id/1040437nvdThird Party AdvisoryVDB Entry
access.redhat.com/errata/RHSA-2018:0469nvdThird Party Advisory
access.redhat.com/errata/RHSA-2018:0483nvdThird Party Advisory
kb.isc.org/docs/aa-01567nvdVendor Advisory
lists.debian.org/debian-lts-announce/2018/03/msg00015.htmlnvdThird Party Advisory
usn.ubuntu.com/3586-1/nvdThird Party Advisory
usn.ubuntu.com/3586-2/nvdThird Party Advisory
www.debian.org/security/2018/dsa-4133nvdThird Party Advisory
security.netapp.com/advisory/ntap-20250425-0010/nvd

News mentions

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