NVD / CVE Program· CNA isc

CVE-2017-3144: Failure to properly clean up closed OMAPI connections can exhaust available sockets

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Plan (action score 52/100)

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: 72.7% (FIRST EPSS); higher than 99.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: isc-dhcp (Debian:12) 4.3.5-3.1; isc-dhcp (Debian:8) 4.3.1-6+deb8u3; isc-dhcp (Debian:9) 4.3.5-3+deb9u1.
Severity is disputed: the assigning authority (CNA) scores it 5.3, NVD 7.5.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Add it to your regular patch cycle. Upgrade to isc-dhcp (Debian:12) 4.3.5-3.1; isc-dhcp (Debian:8) 4.3.1-6+deb8u3; isc-dhcp (Debian:9) 4.3.5-3+deb9u1 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

A vulnerability stemming from failure to properly clean up closed OMAPI connections can lead to exhaustion of the pool of socket descriptors available to the DHCP server. Affects ISC DHCP 4.1.0 to 4.1-ESV-R15, 4.2.0 to 4.2.8, 4.3.0 to 4.3.6. Older versions may also be affected but are well beyond their end-of-life (EOL). Releases prior to 4.1.0 have not been tested.

Published: Jan 16, 2019
Updated: Jun 16, 2026
EPSS: 72.7% · 99th percentile
CWE: CWE-400

Report tools

JSON

Action score

Plan

Add it to your regular patch cycle.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 22 / 30 · 72.7%

CNA vs NVD score

NVD: 7.5
CNA · isc: 5.3; 2.2 point gap

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

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.

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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.

Vendor	Product	CPE
isc	dhcp	cpe:2.3:a:isc:dhcp
redhat	enterprise linux desktop	cpe:2.3:o:redhat:enterprise_linux_desktop
redhat	enterprise linux server	cpe:2.3:o:redhat:enterprise_linux_server
redhat	enterprise linux server aus	cpe:2.3:o:redhat:enterprise_linux_server_aus
redhat	enterprise linux server eus	cpe:2.3:o:redhat:enterprise_linux_server_eus
redhat	enterprise linux server tus	cpe:2.3:o:redhat:enterprise_linux_server_tus
redhat	enterprise linux workstation	cpe:2.3:o:redhat:enterprise_linux_workstation
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
debian	debian linux	cpe:2.3:o:debian:debian_linux

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
- ISC DHCP 4.1.0 to 4.1-ESV-R15, 4.2.0 to 4.2.8, 4.3.0 to 4.3.6. Older versions may also be affected but are well beyond their end-of-life (EOL). Releases prior to 4.1.0 have not been tested.affected

Affected versions · NVD (19)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

canonical ubuntu linux14.04
canonical ubuntu linux16.04
canonical ubuntu linux17.10
debian debian linux8.0
debian debian linux9.0
isc dhcp4.2.0 and later · up to 4.2.8 inclusive
isc dhcp4.3.0 and later · up to 4.3.6 inclusive
isc dhcp4.1-esv
isc dhcp4.1.0
redhat enterprise linux desktop7.0
redhat enterprise linux server7.0
redhat enterprise linux server aus7.4
redhat enterprise linux server aus7.6
redhat enterprise linux server eus7.4
redhat enterprise linux server eus7.5
redhat enterprise linux server eus7.6
redhat enterprise linux server tus7.4
redhat enterprise linux server tus7.6
redhat enterprise linux workstation7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	isc-dhcp	before 4.3.5-3.1	4.3.5-3.1
Debian:8	isc-dhcp	before 4.3.1-6+deb8u3	4.3.1-6+deb8u3
Debian:9	isc-dhcp	before 4.3.5-3+deb9u1	4.3.5-3+deb9u1
openSUSE:Tumbleweed	dhcp	before 4.4.2.P1-2.4	4.4.2.P1-2.4
Red Hat:enterprise_linux:7::client	dhclient	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
Red Hat:enterprise_linux:7::client	dhcp	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
Red Hat:enterprise_linux:7::client	dhcp-common	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
Red Hat:enterprise_linux:7::client	dhcp-debuginfo	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
Red Hat:enterprise_linux:7::client	dhcp-devel	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
Red Hat:enterprise_linux:7::client	dhcp-libs	before 12:4.2.5-58.el7_4.1	12:4.2.5-58.el7_4.1
SUSE:Linux Enterprise Desktop 12 SP2	dhcp	before 4.3.3-10.11.1	4.3.3-10.11.1
SUSE:Linux Enterprise Software Development Kit 11 SP4	dhcp	before 4.2.4.P2-0.28.5.3	4.2.4.P2-0.28.5.3

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…
55Plan
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…
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…
48Plan

Published before and after this one in the same product

← EarlierCVE-2013-2494Mar 28, 2013 · libdns in ISC DHCP 4.2.x before 4.2.5-P1 allows remote name servers to cause a denial of service (memory consumption) via vectors involving…
19Monitor
← EarlierCVE-2016-2774Mar 9, 2016 · ISC 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…
45Plan
Later →CVE-2018-5733Jan 16, 2019 · A malicious client can overflow a reference counter in ISC dhcpd
36Monitor

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
debian:isc-dhcp	4.3.5-3.1 · Debian:12	Package registry (OSV)
opensuse:dhcp	4.4.2.P1-2.4 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:dhclient	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:dhcp	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:dhcp-common	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:dhcp-debuginfo	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:dhcp-devel	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
red hat:dhcp-libs	12:4.2.5-58.el7_4.1 · Red Hat:enterprise_linux:7::client	Package registry (OSV)
suse:dhcp	4.2.4.P2-0.28.5.3 · SUSE:Linux Enterprise Software Development Kit 11 SP4	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.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-18-012 · Jan 17, 2018(ISC, DHCP ve BIND İçin Güvenlik Önerileri Yayınladı)

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet 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: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

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)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:48 PM UTC

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

References

www.securityfocus.com/bid/102726

Show all references (5 more)

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

All records