Description
Multiple memory leaks in ISC DHCP 4.1.x and 4.2.x before 4.2.4-P1 and 4.1-ESV before 4.1-ESV-R6 allow remote attackers to cause a denial of service (memory consumption) by sending many requests.
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 | 4.2.4-2 | — |
| Debian 12 | isc-dhcp | 4.2.4-2 | — |
| Debian 6.0 | isc-dhcp | 4.1.1-P1-15+squeeze4 | DSA-2519-2, DSA-2519-1, DSA-2516-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6 | dhcp +3 | 12:4.1.1-31.P1.el6_3.1 | RHSA-2012:1141 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | dhcp | 4.3.3.P1-3.1 | openSUSE-SU-2024:10358-1 |
Advisories 5
- RHSA-2012:1141 Red Hat Security Advisory: dhcp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-2519-1 isc-dhcp - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2519-2 isc-dhcp - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-2516-1 isc-dhcp - denial of service Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10358-1 dhcp-4.3.3.P1-3.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- 1027300 vdb-entry
- DSA-2516 vendor-advisory
- RHSA-2012:1141 vendor-advisory
- MDVSA-2012:116 vendor-advisory
- openSUSE-SU-2012:1006 vendor-advisory
- MDVSA-2012:115 vendor-advisory
- DSA-2519 vendor-advisory
- USN-1519-1 vendor-advisory
- https://kb.isc.org/article/AA-00737
- GLSA-201301-06 vendor-advisory
- 54665 vdb-entry