Description
In ISC DHCP 1.0 -> 4.4.3, ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16-P1 a system with access to a DHCP server, sending DHCP packets crafted to include fqdn labels longer than 63 bytes, could eventually cause the server to run out of memory.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| ISC | ISC DHCP | 1.0 through versions before 4.1-ESV-R16-P2, 4.2 through versions before 4.4.3.-P1 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 13 | isc-dhcp | 4.4.3-2.1 | — |
| Debian 12 | isc-dhcp | 4.4.3-2.1 | — |
| Debian 11 | isc-dhcp | 4.4.1-2.3+deb11u1 | DSA-5251-1 |
| Debian 10 | isc-dhcp | 4.4.1-2+deb10u2 | DLA-3146-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | isc-dhcp | 4.4.1-2.3ubuntu2.3 | USN-5658-1 |
| Ubuntu 20.04 LTS | isc-dhcp | 4.4.1-2.1ubuntu5.20.04.4 | USN-5658-1 |
| Ubuntu 18.04 LTS | isc-dhcp | 4.3.5-3ubuntu7.4 | USN-5658-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | isc-dhcp | 4.3.3-5ubuntu12.10+esm2 | USN-5658-2 |
| Ubuntu Pro 14.04 LTS | isc-dhcp | 4.2.4-7ubuntu12.13+esm2 | USN-5658-3 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | dhcp +4 | 12:4.4.2-18.b1.el9 | RHSA-2023:2502 |
| RHEL 8 | dhcp +5 | 12:4.3.6-49.el8 | RHSA-2023:3000 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | dhcp-relay +3 | 12:4.4.2-18.b1.el9 | ALSA-2023:2502 |
| AlmaLinux 8 | dhcp-libs +4 | 12:4.3.6-49.el8 | ALSA-2023:3000 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP4 | dhcp | 4.3.6.P1-150000.6.17.1 | SUSE-SU-2022:3991-1 |
| SLES 15 SP3 | dhcp | 4.3.6.P1-150000.6.17.1 | SUSE-SU-2022:3991-1 |
| SLES 12 SP5 | dhcp | 4.3.3-10.28.1 | SUSE-SU-2022:3992-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | dhcp | 4.3.3-10.28.1 | SUSE-SU-2022:3992-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dhcp | 4.4.2.P1-11.1 | openSUSE-SU-2024:12390-1 |
| openSUSE Leap 15.4 | dhcp | 4.3.6.P1-150000.6.17.1 | SUSE-SU-2022:3991-1 |
| openSUSE Leap 15.3 | dhcp | 4.3.6.P1-150000.6.17.1 | SUSE-SU-2022:3991-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.20 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.19 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.18 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.17 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.16 | dhcp | 4.4.3_p1-r0 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.15 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.14 | dhcp | 4.4.3_p1-r0 | — |
| Alpine v3.13 | dhcp | 4.4.3_p1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | dhcp +4 | 12:4.2.5-79.amzn2.1.2 | ALAS2-2022-1874 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | dhcp-relay +3 | 12:4.4.2-18.b1.el9 | ELSA-2023-2502 |
| Oracle Linux 8 | dhcp-libs +4 | 12:4.3.6-49.el8 | ELSA-2023-3000 |
Advisories 19
- ALSA-2023:2502 Moderate: dhcp security and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:3000 Moderate: dhcp security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:3000 Red Hat Security Advisory: dhcp security and bug fix update Red Hat Security Advisories (RHSA) · Jul 3, 2026
- RHSA-2023:2502 Red Hat Security Advisory: dhcp security and enhancement update Red Hat Security Advisories (RHSA) · Jul 3, 2026
- USN-5658-3 isc-dhcp vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-5658-2 isc-dhcp vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- USN-5658-1 isc-dhcp vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-5251-1 isc-dhcp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3146-1 isc-dhcp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:12390-1 dhcp-4.4.2.P1-11.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3991-1 Security update for dhcp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2022:3992-1 Security update for dhcp SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1424 Xerox FreeFlow Print Server für Solaris: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 6, 2025
- SCA-2025-0011 Vulnerabilities affecting Endress+Hauser SSG-E210GC SICK PSIRT · Oct 2, 2025
- SCA-2025-0009 Vulnerabilities affecting SICK TDC-E210GC SICK PSIRT · Aug 1, 2025
- WID-SEC-2022-1634 Internet Systems Consortium DHCP: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Jul 23, 2023
- ELSA-2023-3000 Moderate: dhcp security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 24, 2023
- ELSA-2023-2502 Moderate: dhcp security and enhancement update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 15, 2023
- ALAS2-2022-1874 Moderate: dhcp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 8, 2022
References
- https://kb.isc.org/docs/cve-2022-2929
- [debian-lts-announce] 20221010 [SECURITY] [DLA 3146-1] isc-dhcp security update mailing-list
- FEDORA-2022-f5a45757df vendor-advisory
- FEDORA-2022-9ca9a94e28 vendor-advisory
- FEDORA-2022-c4f274a54f vendor-advisory
- GLSA-202305-22 vendor-advisory