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CVE-2022-2929· NVD / CVE Program· CNA isc

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

Noroxi assessment

Priority: Monitor (action score 26/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.66% (FIRST EPSS); higher than 50.5% of all records.
  • 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.
  • Fixed version: Azure Linux 3.0 ARM 4.4.3.P1-1; Azure Linux 3.0 x64 4.4.3.P1-1.

Low priority for now. Upgrade to Azure Linux 3.0 ARM 4.4.3.P1-1; Azure Linux 3.0 x64 4.4.3.P1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Oct 7, 2022
Updated
Jun 17, 2026
EPSS
0.7% · 51th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

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.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2022-2929

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
iscdhcp
debiandebian linux
fedoraprojectfedora

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.

EcosystemPackageAffected rangeFix
AlmaLinux:8dhcp-clientbefore 12:4.3.6-49.el812:4.3.6-49.el8
AlmaLinux:8dhcp-commonbefore 12:4.3.6-49.el812:4.3.6-49.el8
AlmaLinux:8dhcp-libsbefore 12:4.3.6-49.el812:4.3.6-49.el8
AlmaLinux:8dhcp-relaybefore 12:4.3.6-49.el812:4.3.6-49.el8
AlmaLinux:8dhcp-serverbefore 12:4.3.6-49.el812:4.3.6-49.el8
AlmaLinux:9dhcp-clientbefore 12:4.4.2-18.b1.el912:4.4.2-18.b1.el9
AlmaLinux:9dhcp-commonbefore 12:4.4.2-18.b1.el912:4.4.2-18.b1.el9
AlmaLinux:9dhcp-relaybefore 12:4.4.2-18.b1.el912:4.4.2-18.b1.el9
AlmaLinux:9dhcp-serverbefore 12:4.4.2-18.b1.el912:4.4.2-18.b1.el9
Alpine:v3.13dhcpfrom 1.0.0 · before 4.4.3_p1-r04.4.3_p1-r0
Debian:10isc-dhcpbefore 4.4.1-2+deb10u24.4.1-2+deb10u2
Debian:11isc-dhcpbefore 4.4.1-2.3+deb11u14.4.1-2.3+deb11u1
Debian:12isc-dhcpbefore 4.4.3-2.14.4.3-2.1
openSUSE:Tumbleweeddhcpbefore 4.4.2.P1-11.14.4.2.P1-11.1
Red Hat:enterprise_linux:8::baseosdhcpbefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-clientbefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-client-debuginfobefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-commonbefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-debuginfobefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-debugsourcebefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-libsbefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-libs-debuginfobefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-relaybefore 12:4.3.6-49.el812:4.3.6-49.el8
Red Hat:enterprise_linux:8::baseosdhcp-relay-debuginfobefore 12:4.3.6-49.el812:4.3.6-49.el8

+15

Same product

isc: all records

Other 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 t
    55Plan
  • CVE-2017-3144Failure to properly clean up closed OMAPI connections can exhaust available sockets
    52Plan
  • 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 crash
    51Plan
  • 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 4.0.1
    48Plan
  • 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 rem
    45Plan
  • 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 a
    43Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Azure Linux 3.0 ARM4.4.3.P1-1 · dhcpMicrosoft (MSRC)
Azure Linux 3.0 x644.4.3.P1-1 · dhcpMicrosoft (MSRC)
almalinux:dhcp-client12:4.4.2-18.b1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:dhcp-common12:4.4.2-18.b1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:dhcp-libs12:4.3.6-49.el8 · AlmaLinux:8Package registry (OSV)
almalinux:dhcp-relay12:4.4.2-18.b1.el9 · AlmaLinux:9Package registry (OSV)
almalinux:dhcp-server12:4.4.2-18.b1.el9 · AlmaLinux:9Package registry (OSV)
alpine:dhcp4.4.3_p1-r0 · Alpine:v3.13Package registry (OSV)
debian:isc-dhcp4.4.3-2.1 · Debian:12Package registry (OSV)
opensuse:dhcp4.3.6.P1-150000.6.17.1 · openSUSE:Leap 15.3Package registry (OSV)
red hat:dhcp12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-client12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-client-debuginfo12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-common12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-debuginfo12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-debugsource12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-libs12:4.3.6-49.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:dhcp-libs-debuginfo12:4.3.6-49.el8 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:dhcp-relay12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-relay-debuginfo12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-server12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:dhcp-server-debuginfo12:4.4.2-18.b1.el9 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
suse:dhcp4.3.6.P1-150000.6.17.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP3Package 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.

EPSS, last 120 days

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 researchers

Finders, 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 Throttling

CVSS 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.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records