DHCP memory leak
Published Oct 7, 2022
6.5
MEDIUMCVSS 3.1
EPSS 0.64%
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
-
- Version 1.0 through versions before 4.1-ESV-R16-P2StatusaffectedConstraints-
- Version 4.2 through versions before 4.4.3.-P1StatusaffectedConstraints-
- Version
Configuration 1
- ≥ 1.0.0 · < 4.1-esv
- ≥ 4.2.0 · ≤ 4.4.3
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
- 4.1-esv
Configuration 2
- 10.0
Configuration 3
- 35
- 36
- 37
No data.
Red Hat Enterprise Linux 8
dhcp-12:4.3.6-49.el8
Fixed · RHSA-2023:3000
Red Hat Enterprise Linux 9
dhcp-12:4.4.2-18.b1.el9
Fixed · RHSA-2023:2502
Red Hat Enterprise Linux 6
dhcp
Out of support scope
Red Hat Enterprise Linux 7
dhcp
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | dhcp-12:4.3.6-49.el8 | Fixed | RHSA-2023:3000 |
| Red Hat Enterprise Linux 9 | dhcp-12:4.4.2-18.b1.el9 | Fixed | RHSA-2023:2502 |
| Red Hat Enterprise Linux 6 | dhcp | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | dhcp | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
Vendor solution
Upgrade to the patched release most closely related to your current version of ISC DHCP. These can all be downloaded from https://www.isc.org/downloads. 4.4.3-P1 4.1-ESV-R16-P2
Red Hat mitigation
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.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2022–2026- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (14 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.64% (0.00640) | 48.77th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.63% (0.00625) | 45.03th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.04% (0.00045) | 10.93th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.10% (0.00099) | 42.83th | v3 (v2023.03.01) |
| May 14, 2024 | 0.10% (0.00099) | 40.81th | v3 (v2023.03.01) |
| Apr 29, 2024 | 0.09% (0.00086) | 35.62th | v3 (v2023.03.01) |
| Jan 12, 2024 | 0.08% (0.00079) | 33.21th | v3 (v2023.03.01) |
| Nov 9, 2023 | 0.06% (0.00060) | 23.97th | v3 (v2023.03.01) |
| May 4, 2023 | 0.05% (0.00050) | 17.37th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.04% (0.00042) | 5.63th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.63% (0.01626) | 75.89th | v2 (v2022.01.01) |
| Oct 18, 2022 | 1.63% (0.01626) | 75.16th | v2 (v2022.01.01) |
| Oct 15, 2022 | 0.95% (0.00954) | 34.95th | v2 (v2022.01.01) |
| Oct 7, 2022 | 0.89% (0.00885) | 26.49th | v2 (v2022.01.01) |
References (10)
- https://access.redhat.com/security/cve/CVE-2022-2929 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2132001 Issue Tracking
- https://kb.isc.org/docs/cve-2022-2929 Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2022/10/msg00015.html mailing-listMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/ vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/ vendor-advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/ vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2022-2929
- https://security.gentoo.org/glsa/202305-22 vendor-advisory
- https://www.cve.org/CVERecord?id=CVE-2022-2929
Change history (0)
No recorded changes yet.