ISC DHCP 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1 allows remote attackers to cause a denial of service (server exit) via a zero-length cl
ISC DHCP 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1 allows remote attackers to cause a denial of service (server exit) via a zero-length client ID.
- Published
- Jun 7, 2010
- Updated
- Jun 16, 2026
- EPSS
- 76.4% · 100th percentile
- CWE
- CWE-189
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Report tools
Action score
43
Plan
Add it to your regular patch cycle.
- CVSS
- 20 / 40 · 5.0 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 23 / 30 · 76.4%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| isc | dhcp | cpe:2.3:a:isc:dhcp |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- isc dhcp4.0.0
- isc dhcp4.0.1
- isc dhcp4.0.2
- isc dhcp4.1.0
- isc dhcp4.1.1
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 4.1.1-P1-1 | 4.1.1-P1-1 |
| openSUSE:Tumbleweed | dhcp | before 4.3.3.P1-3.1 | 4.3.3.P1-3.1 |
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 |
|---|---|---|
| debian:isc-dhcp | 4.1.1-P1-1 · Debian:12 | Package registry (OSV) |
| opensuse:dhcp | 4.3.3.P1-3.1 · openSUSE:Tumbleweed | Package registry (OSV) |
Exploit status
Weaponized
A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.
Evidence
- Metasploit module ×1
- Exploit-DB entry ×1
Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.
| Source | Kind | Date |
|---|---|---|
| Exploit-DB entry | dos | 2010-07-03 |
| Metasploit module | auxiliary/dos/dhcp/isc_dhcpd_clientidISC DHCP Zero Length ClientID Denial of Service Moduleauxiliary | — |
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.
- Published
- First PoC+25 d
- TodaySep 30, 2026+5959 d
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.
No credits in the CNA record.
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
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- P · the service can be disrupted
- Attack complexity
- Low
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- P
Weakness class (CWE)
CWE-189 · Numeric ErrorsCVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
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✗ → ✓
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References
- ftp.isc.org/isc/dhcp/dhcp-4.0.2-P1-RELNOTES
- ftp.isc.org/isc/dhcp/dhcp-4.1.1-P1-RELNOTES
- lists.fedoraproject.org/pipermail/package-announce/2010-June/042843.html
- secunia.com/advisories/40116
- www.exploit-db.com/exploits/14185
- www.mandriva.com/security/advisories?name=MDVSA-2010:114
- www.securityfocus.com/bid/40775
- www.securitytracker.com/id?1024093
- exchange.xforce.ibmcloud.com/vulnerabilities/59222
Vendor advisories and official records. Exploit/PoC links are deliberately left out.