CVE-2018-5733
A malicious client can overflow a reference counter in ISC dhcpd
02 Description
A malicious client can overflow a reference counter in ISC dhcpd
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 20.24% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 97.2% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2019-01-16 20:00Z7 YR AGO
- Last updated
- 2025-04-25 23:02Z1 YR AGO
- Reserved
- 2018-01-17
- Assigning CNA
- isc
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 5.9)
- CNA CVSS vector
- CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-190Integer Overflow or WraparoundBase
- Data version
- 5.1
- Document digest
- eb1aa479a01169009da4303526870809f59d307138be1284e15e6f56f61e6fa7
05 Affected products
06 References
- kb.isc.orghttps://kb.isc.org/docs/aa-01567
- access.redhat.comRHSA-2018:0469https://access.redhat.com/errata/RHSA-2018:0469
- www.debian.orgDSA-4133https://www.debian.org/security/2018/dsa-4133
- usn.ubuntu.comUSN-3586-2https://usn.ubuntu.com/3586-2/
- access.redhat.comRHSA-2018:0483https://access.redhat.com/errata/RHSA-2018:0483
- usn.ubuntu.comUSN-3586-1https://usn.ubuntu.com/3586-1/
- www.securityfocus.com103188http://www.securityfocus.com/bid/103188
- www.securitytracker.com1040437http://www.securitytracker.com/id/1040437
- lists.debian.org[debian-lts-announce] 20180322 [SECURITY] [DLA 1313-1] isc-dhcp security updatehttps://lists.debian.org/debian-lts-announce/2018/03/msg00015.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20250425-0010/
07 Remediation
Upgrade to the patched release most closely related to your current version of DHCP. DHCP 4.1-ESV-R15-P1 DHCP 4.3.6-P1 DHCP 4.4.1
08 Fixed in
Arch Linux
- dhcp Fixed in 4.4.1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- isc-dhcp Fixed in 4.3.5-3.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- isc-dhcp Fixed in 4.3.5-3.1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- isc-dhcp Fixed in 4.2.4-7ubuntu12.12
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- isc-dhcp Fixed in 4.3.3-5ubuntu12.9
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- isc-dhcp Fixed in 4.3.5-3ubuntu5
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.