Which products and versions are affected by CVE-2009-0692?

Affected: Dhcp (Isc) versions 2.0, 3.0, 3.1, 4.0, 4.1.0; dhcp3 (debian). The full list is in the CVE brief.

Is CVE-2009-0692 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2009-0692 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2009-0692?

Public exploit code is available.

Is there a fix for CVE-2009-0692?

Fixed versions are available, including Dhcp 7:3.0.1-10.2_EL3, Dhcp 7:3.0.1-65.el4_8.1, dhcp3 3.0.4-13+etch2.

How urgently should CVE-2009-0692 be patched?

Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

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WatchlistCritical

CVE-2009-0692Dhcp Memory Corruption

dhclient: stack overflow leads to arbitrary code execution as root

Published Jul 14, 2009 · Updated Mar 9, 2026 · Also known as DEBIAN-CVE-2009-0692, DSA-1833-1, DSA-1833-2

Key Facts

Patch immediately

CVE-2009-0692 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Dhcp (Isc), dhcp3 (debian).
It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
EPSS estimates a 26% probability of exploitation in the next 30 days.
Fixed versions are available, including Dhcp 7:3.0.1-10.2_EL3, Dhcp 7:3.0.1-65.el4_8.1, dhcp3 3.0.4-13+etch2.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Scores

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

26%

Higher than 97.9% of all scored CVEs

Exploit maturity

Proof of concept

ATLAS score

42/100

Publication score, see How it works

Exploitation Verdict

KEV listed

Not listed

Federal due date

None

No federal due date

Ransomware use

Not reported

Attributed actors

None named

Exploit & Defence Guidance

Exploit maturity

Proof of concept

Public exploit code

Proof-of-concept links

In-the-wild evidence

Reports of active use

Advisories And Exploit References

Description

Stack-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 4.0.1p1, 3.1 before 3.1.2p1, 3.0, and 2.0 allows remote DHCP servers to execute arbitrary code via a crafted subnet-mask option.

Affected Products

8 affected entries in total

Product	Affected versions	Fixed in
DhcpIsc	2.0, 3.0, 3.1, 4.0, 4.1.0	7:3.0.1-10.2_EL3
dhcp3debian	See advisory	3.0.4-13+etch2

Patched Releases

Dhcp

7:3.0.1-10.2_EL3, 7:3.0.1-65.el4_8.1

dhcp3

3.0.4-13+etch2, 3.1.1-6+lenny2, 3.1.1-6+lenny3

Timeline

Publicly disclosed
Jul 14, 2009
Last updated
Mar 9, 2026

Weakness Type

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-121 Stack-based Buffer Overflow
CWE-130 Improper Handling of Length Parameter Inconsistency
CWE-805 Buffer Access with Incorrect Length Value

References

15 more references in the full CVE brief

FAQ

Common Questions.

Stack-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 4.0.1p1, 3.1 before 3.1.2p1, 3.0, and 2.0 allows remote DHCP servers to execute arbitrary code via a crafted subnet-mask option.
Affected: Dhcp (Isc) versions 2.0, 3.0, 3.1, 4.0, 4.1.0; dhcp3 (debian). 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 7:3.0.1-10.2_EL3, Dhcp 7:3.0.1-65.el4_8.1, dhcp3 3.0.4-13+etch2.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.

Is CVE-2009-0692 On Your Attack Surface?

Brandefense matches it against the products discovered on your perimeter and opens a finding the day a CVE like this is listed.