Cisco IOS 12.2(14)SZ/12.2(18) DHCP denial of service

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Cisco IOS 12.2(14)SZ/12.2(18). Affected is an unknown function of the component DHCP Handler. The manipulation leads to denial of service. This vulnerability is traded as CVE-2004-1111. It is possible to initiate the attack remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Cisco IOS 12.2(14)SZ/12.2(18) (Router Operating System). It has been rated as critical. This issue affects some unknown functionality of the component DHCP Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

Cisco IOS 2.2(18)EW, 12.2(18)EWA, 12.2(14)SZ, 12.2(18)S, 12.2(18)SE, 12.2(18)SV, 12.2(18)SW, and other versions without the "no service dhcp" command, keep undeliverable DHCP packets in the queue instead of dropping them, which allows remote attackers to cause a denial of service (dropped traffic) via multiple undeliverable DHCP packets that exceed the input queue size.

The bug was discovered 11/10/2004. The weakness was shared 11/10/2004 with Cisco (Website). The advisory is shared at cisco.com. The identification of this vulnerability is CVE-2004-1111 since 11/30/2004. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 15782 (Cisco IOS Malformed DHCP Packet DoS (CSCee50294)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO, running in the context l and relying on port 161. The commercial vulnerability scanner Qualys is able to test this issue with plugin 38351 (Cisco IOS DHCP Input Queue Blocking Denial of Service Vulnerability).

Upgrading eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at cisco.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at X-Force (18021), Tenable (15782), SecurityFocus (BID 11649†), OSVDB (11605†) and Secunia (SA13148†). c3rb3r.openwall.net is providing further details. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 15782
Nessus Name: Cisco IOS Malformed DHCP Packet DoS (CSCee50294)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Patch: cisco.com

Timelineinfo

11/10/2004 🔍
11/10/2004 +0 days 🔍
11/10/2004 +0 days 🔍
11/10/2004 +0 days 🔍
11/10/2004 +0 days 🔍
11/11/2004 +1 days 🔍
11/11/2004 +0 days 🔍
11/16/2004 +4 days 🔍
11/22/2004 +6 days 🔍
11/29/2004 +7 days 🔍
11/30/2004 +1 days 🔍
01/10/2005 +41 days 🔍
07/06/2025 +7482 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Researcher: http://www.cisco.com
Organization: Cisco
Status: Confirmed

CVE: CVE-2004-1111 (🔍)
GCVE (CVE): GCVE-0-2004-1111
GCVE (VulDB): GCVE-100-989

OVAL: 🔍

CERT: 🔍
X-Force: 18021 - Cisco IOS DHCP denial of service, Medium Risk
SecurityFocus: 11649 - Cisco IOS DHCP Input Queue Blocking Denial Of Service Vulnerability
Secunia: 13148 - Cisco IOS DHCP Packet Handling Denial of Service Vulnerability, Less Critical
OSVDB: 11605 - Cisco IOS Malformed DHCP Packet DoS
SecurityTracker: 1012166
SecuriTeam: securiteam.com
Vulnerability Center: 6220 - [cisco-sa-20041110-dhcp] DoS in Cisco Devices running Cisco IOS via DHCP Packets, Low

Misc.: 🔍

Entryinfo

Created: 11/16/2004 13:31
Updated: 07/06/2025 21:43
Changes: 11/16/2004 13:31 (89), 06/30/2019 09:47 (8), 12/16/2024 08:37 (17), 07/06/2025 21:43 (2)
Complete: 🔍
Cache ID: 216:A5D:103

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