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Fencer Vulns
medium 6.5

CVE-2022-2929 json

DHCP memory leak

published 2022-10-07 4 y ago modified 2026-06-17 4 mo ago also EUVD-2022-35152

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 51%
public exploits
0
none known

Summary

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.

Patch / fix

  • isc dhcp 4.1-esv
  • isc-dhcp Debian 13, Debian 12 4.4.3-2.1

debian advisories DEBIAN-CVE-2022-2929

  • isc-dhcp Ubuntu 18.04 LTS 4.3.5-3ubuntu7.4
  • isc-dhcp Ubuntu 20.04 LTS 4.4.1-2.1ubuntu5.20.04.4
  • isc-dhcp Ubuntu 22.04 LTS 4.4.1-2.3ubuntu2.3
  • isc-dhcp Ubuntu Pro 14.04 LTS 4.2.4-7ubuntu12.13+esm2
  • isc-dhcp Ubuntu Pro 16.04 LTS 4.3.3-5ubuntu12.10+esm2

ubuntu advisories UBUNTU-CVE-2022-2929

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • dhcp RHEL 8 12:4.3.6-49.el8
  • dhcp-libs RHEL 8 12:4.3.6-49.el8
  • dhcp-relay RHEL 8 12:4.3.6-49.el8
  • dhcp-client RHEL 8 12:4.3.6-49.el8
  • dhcp-common RHEL 8 12:4.3.6-49.el8
  • dhcp-server RHEL 8 12:4.3.6-49.el8
  • dhcp RHEL 9 12:4.4.2-18.b1.el9
  • dhcp-relay RHEL 9 12:4.4.2-18.b1.el9

red hat advisories RHSA-2023:3000RHSA-2023:2502

  • dhcp SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.3.3-10.28.1
  • dhcp SLE Module for Server Applications 15 SP4, SLE Module for Server Applications 15 SP3, SLE Module for Basesystem 15 SP4 +3 more 4.3.6.P1-150000.6.17.1

suse advisories SUSE-SU-2022:3992-1SUSE-SU-2022:3991-1

  • dhcp openSUSE Tumbleweed 4.4.2.P1-11.1

opensuse advisories openSUSE-SU-2024:12390-1

  • dhcp-libs AlmaLinux 8 12:4.3.6-49.el8
  • dhcp-relay AlmaLinux 8 12:4.3.6-49.el8
  • dhcp-client AlmaLinux 8 12:4.3.6-49.el8
  • dhcp-common AlmaLinux 8 12:4.3.6-49.el8
  • dhcp-server AlmaLinux 8 12:4.3.6-49.el8
  • dhcp-relay AlmaLinux 9 12:4.4.2-18.b1.el9
  • dhcp-client AlmaLinux 9 12:4.4.2-18.b1.el9
  • dhcp-common AlmaLinux 9 12:4.4.2-18.b1.el9

almalinux advisories ALSA-2023:3000ALSA-2023:2502

  • dhcp Alpine 3.20, Alpine 3.19, Alpine 3.18 +5 more 4.4.3_p1-r0

alpine advisories ALPINE-CVE-2022-2929

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2022-2929 updated cvss 6.5

dhcp: DHCP memory leak

  • Red Hat Enterprise Linux 6 dhcp, dhclient, dhcp-common Red Hat Enterprise Linux 7 dhcp, dhclient, dhcp-libs, dhcp-common
    affected: workaround, no fix planned “Possible workaround - As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround.”
  • Red Hat Enterprise Linux BaseOS (v. 8) dhcp 4.3.6-49.el8, dhcp-libs 4.3.6-49.el8, dhcp-relay 4.3.6-49.el8, dhcp-client 4.3.6-49.el8, dhcp-common 4.3.6-49.el8, dhcp-server 4.3.6-49.el8
    fixed: vendor fix “Possible workaround - As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround.” RHSA-2023:3000
  • Red Hat Enterprise Linux BaseOS (v. 9) dhcp 4.4.2-18.b1.el9, dhcp-relay 4.4.2-18.b1.el9, dhcp-client 4.4.2-18.b1.el9, dhcp-common 4.4.2-18.b1.el9, dhcp-server 4.4.2-18.b1.el9
    fixed: vendor fix “Possible workaround - As exploiting this vulnerability requires an attacker to send packets for an extended period of time, restarting servers periodically could be a viable workaround.” RHSA-2023:2502

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.66% chance of exploitation in the next 30 days, higher than 51% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • ISC ISC DHCP

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.