CVE-2010-2156
MediumPublic exploitISC 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 Aug 4, 2026 · Also known as DEBIAN-CVE-2010-2156
Key Facts
Patch immediately- CVE-2010-2156 is a medium-severity vulnerability (CVSS 5.0 v2) affecting Dhcp (Isc), isc-dhcp (debian), dhcp-client (suse) and 4 more products.
- It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
- EPSS estimates a 76% probability of exploitation in the next 30 days.
- Fixed versions are available, including Dhcp 4.3.3.P1-3.1, dhcp-client 4.3.3.P1-3.1, dhcp-devel 4.3.3.P1-3.1.
- Brandefense priority: patch immediately, because it is very likely to be exploited soon.
CVSS v2
5.0
AV:N/AC:L/Au:N/C:N/I:N/A:P
EPSS (30-day exploit likelihood)
76%
Higher than 99.5% of all scored CVEs
Exploited in the wild
No known
Not in a known-exploited catalog
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
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.
Affected Products
30 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DhcpIsc | 4.0.0, 4.0.1, 4.0.1-b1, 4.0.1-rc1, 4.0.2, 4.0.2-b1, 4.0.2-b2, 4.0.2-b3 | 4.3.3.P1-3.1 |
| isc-dhcpdebian | See advisory | 4.1.1-P1-1 |
| dhcp-clientsuse | See advisory | 4.3.3.P1-3.1 |
| dhcp-develsuse | See advisory | 4.3.3.P1-3.1 |
| dhcp-docsuse | See advisory | 4.3.3.P1-3.1 |
Patched Releases
Dhcp
4.3.3.P1-3.1
dhcp-client
4.3.3.P1-3.1
dhcp-devel
4.3.3.P1-3.1
dhcp-doc
4.3.3.P1-3.1
dhcp-relay
4.3.3.P1-3.1
dhcp-server
4.3.3.P1-3.1
isc-dhcp
4.1.1-P1-1
Timeline
Publicly disclosed
Jun 7, 2010
Last updated
Aug 4, 2026
Weakness Type
- CWE-189
References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2010-2156
- exploitExploitDB-14185
- otherhttp://ftp.isc.org/isc/dhcp/dhcp-4.0.2-P1-RELNOTES
- otherhttp://ftp.isc.org/isc/dhcp/dhcp-4.1.1-P1-RELNOTES
- otherFEDORA-2010-9433
FAQ
Common Questions.
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.
Affected: Dhcp (Isc) versions 4.0.0, 4.0.1, 4.0.1-b1, 4.0.1-rc1, 4.0.2, 4.0.2-b1, 4.0.2-b2, 4.0.2-b3; isc-dhcp (debian); dhcp-client (suse), among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
Public exploit code is available.
Fixed versions are available, including Dhcp 4.3.3.P1-3.1, dhcp-client 4.3.3.P1-3.1, dhcp-devel 4.3.3.P1-3.1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.
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