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 inclu
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.
- Published
- Oct 7, 2022
- Updated
- Jun 17, 2026
- EPSS
- 0.6% · 49th percentile
- CWE
- CWE-770
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Report tools
Action score
26
Monitor
Low priority for now.
- CVSS
- 26 / 40 · 6.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.6%
CNA vs NVD score
- NVD
- —
- CNA · isc
- 6.5
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| isc | dhcp | cpe:2.3:a:isc:dhcp |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| fedoraproject | fedora | cpe:2.3:o:fedoraproject:fedora |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux10.0
- fedoraproject fedora35
- fedoraproject fedora36
- fedoraproject fedora37
- isc dhcp4.2.0 and later · up to 4.4.3 inclusive
- isc dhcp1.0.0 and later · before 4.1-esv
- isc dhcp4.1-esv
Versions reported by the vendor
Affected version ranges reported by the assigning authority (isc). Independent of NVD's CPE analysis and usually ahead of it.
ISC ISC DHCP
- 1.0 through versions before 4.1-ESV-R16-P2, 4.2 through versions before 4.4.3.-P1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | dhcp-client | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| AlmaLinux:8 | dhcp-common | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| AlmaLinux:8 | dhcp-libs | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| AlmaLinux:8 | dhcp-relay | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| AlmaLinux:8 | dhcp-server | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| AlmaLinux:9 | dhcp-client | before 12:4.4.2-18.b1.el9 | 12:4.4.2-18.b1.el9 |
| AlmaLinux:9 | dhcp-common | before 12:4.4.2-18.b1.el9 | 12:4.4.2-18.b1.el9 |
| AlmaLinux:9 | dhcp-relay | before 12:4.4.2-18.b1.el9 | 12:4.4.2-18.b1.el9 |
| AlmaLinux:9 | dhcp-server | before 12:4.4.2-18.b1.el9 | 12:4.4.2-18.b1.el9 |
| Alpine:v3.13 | dhcp | from 1.0.0 · before 4.4.3_p1-r0 | 4.4.3_p1-r0 |
| Debian:10 | isc-dhcp | before 4.4.1-2+deb10u2 | 4.4.1-2+deb10u2 |
| Debian:11 | isc-dhcp | before 4.4.1-2.3+deb11u1 | 4.4.1-2.3+deb11u1 |
| Debian:12 | isc-dhcp | before 4.4.3-2.1 | 4.4.3-2.1 |
| openSUSE:Tumbleweed | dhcp | before 4.4.2.P1-11.1 | 4.4.2.P1-11.1 |
| Red Hat:enterprise_linux:8::baseos | dhcp | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-client | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-client-debuginfo | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-common | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-debuginfo | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-debugsource | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-libs | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-libs-debuginfo | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-relay | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
| Red Hat:enterprise_linux:8::baseos | dhcp-relay-debuginfo | before 12:4.3.6-49.el8 | 12:4.3.6-49.el8 |
+15
Same product
isc: all recordsOther highest-scoring records for the same primary product.
- CVE-2011-0997dhclient in ISC DHCP 3.0.x through 4.2.x before 4.2.1-P1, 3.1-ESV before 3.1-ESV-R1, and 4.1-ESV before 4.1-ESV-R2 allows remote attackers t55Plan
- CVE-2017-3144Failure to properly clean up closed OMAPI connections can exhaust available sockets52Plan
- CVE-2015-8605ISC DHCP 4.x before 4.1-ESV-R12-P1, 4.2.x, and 4.3.x before 4.3.3-P1 allows remote attackers to cause a denial of service (application crash51Plan
- CVE-2009-0692Stack-based buffer overflow in the script_write_params method in client/dhclient.c in ISC DHCP dhclient 4.1 before 4.1.0p1, 4.0 before 4.0.148Plan
- CVE-2016-2774ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows rem45Plan
- CVE-2011-2749The server in ISC DHCP 3.x and 4.x before 4.2.2, 3.1-ESV before 3.1-ESV-R3, and 4.1-ESV before 4.1-ESV-R3 allows remote attackers to cause a43Plan
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| almalinux:dhcp-client | 12:4.4.2-18.b1.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:dhcp-common | 12:4.4.2-18.b1.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:dhcp-libs | 12:4.3.6-49.el8 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:dhcp-relay | 12:4.4.2-18.b1.el9 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:dhcp-server | 12:4.4.2-18.b1.el9 · AlmaLinux:9 | Package registry (OSV) |
| alpine:dhcp | 4.4.3_p1-r0 · Alpine:v3.13 | Package registry (OSV) |
| debian:isc-dhcp | 4.4.3-2.1 · Debian:12 | Package registry (OSV) |
| opensuse:dhcp | 4.3.6.P1-150000.6.17.1 · openSUSE:Leap 15.3 | Package registry (OSV) |
| red hat:dhcp | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-client | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-client-debuginfo | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-common | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-debuginfo | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-debugsource | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-libs | 12:4.3.6-49.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:dhcp-libs-debuginfo | 12:4.3.6-49.el8 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:dhcp-relay | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-relay-debuginfo | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-server | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| red hat:dhcp-server-debuginfo | 12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseos | Package registry (OSV) |
| suse:dhcp | 4.3.6.P1-150000.6.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
- VictorVCyber Kunlun Lab for discovering and reporting this issue.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone on the same network segment can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Adjacent
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-770 · Allocation of Resources Without Limits or ThrottlingCVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- kb.isc.org/docs/cve-2022-2929
- lists.debian.org/debian-lts-announce/2022/10/msg00015.html
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2SARIK7KZ7MGQIWDRWZFAOSQSPXY4GOU/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QQXYCIWUDILRCNBAIMVFCSGXBRKEPB4K/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/T6IBFH4MRRNJQVWEKILQ6I6CXWW766FX/
- security.gentoo.org/glsa/202305-22
Vendor advisories and official records. Exploit/PoC links are deliberately left out.