Cisco IOS up to 12.4T IPsec IKEv1 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 was found in Cisco IOS up to 12.4T. It has been classified as critical. This vulnerability affects unknown code of the component IPsec IKEv1 Handler. The manipulation leads to denial of service. This vulnerability is referenced as CVE-2005-3669. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cisco IOS up to 12.4T (Router Operating System) and classified as critical. This issue affects an unknown code block of the component IPsec IKEv1 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:

Multiple unspecified vulnerabilities in the Internet Key Exchange version 1 (IKEv1) implementation in multiple Cisco products allow remote attackers to cause a denial of service (device reset) via certain malformed IKE packets, as demonstrated by the PROTOS ISAKMP Test Suite for IKEv1. NOTE: due to the lack of details in the Cisco advisory, it is unclear which of CVE-2005-3666, CVE-2005-3667, and/or CVE-2005-3668 this issue applies to.

The bug was discovered 03/08/2006. The weakness was published 11/14/2005 by Cisco with Oulu University Secure Programming Group (OUSPG) (Website). It is possible to read the advisory at cisco.com. The identification of this vulnerability is CVE-2005-3669 since 11/18/2005. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

We expect the 0-day to have been worth approximately $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 20807 (Cisco IOS IPSec IKE Traffic Remote DoS (CSCed94829)), 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 38493 (Cisco IOS IPSec Unspecified IKE Traffic 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. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (20807), SecurityFocus (BID 15401†), OSVDB (60990†), Secunia (SA17553†) and SecurityTracker (ID 1015202†). ficora.fi is providing further details. Similar entries are available at VDB-1912, VDB-1900, VDB-1898 and VDB-1896. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
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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: 🔍
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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: 20807
Nessus Name: Cisco IOS IPSec IKE Traffic Remote DoS (CSCed94829)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Patch: cisco.com
ISS Proventia IPS: 🔍

Timelineinfo

11/14/2005 🔍
11/14/2005 +0 days 🔍
11/14/2005 +0 days 🔍
11/14/2005 +0 days 🔍
11/14/2005 +0 days 🔍
11/14/2005 +0 days 🔍
11/16/2005 +1 days 🔍
11/18/2005 +2 days 🔍
11/18/2005 +0 days 🔍
11/20/2005 +2 days 🔍
01/25/2006 +66 days 🔍
03/08/2006 +42 days 🔍
06/29/2025 +7052 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Researcher: Cisco
Organization: Oulu University Secure Programming Group (OUSPG)
Status: Confirmed

CVE: CVE-2005-3669 (🔍)
GCVE (CVE): GCVE-0-2005-3669
GCVE (VulDB): GCVE-100-1895

OVAL: 🔍

CERT: 🔍
SecurityFocus: 15401 - Cisco IPSec Unspecified IKE Traffic Denial Of Service Vulnerabilities
Secunia: 17553 - Cisco ISAKMP IKE Message Processing Denial of Service, Moderately Critical
OSVDB: 60990 - Cisco Multiple Products ISAKMP Protocol Unspecified Malformed Input Remote DoS (PROTOS)
SecurityTracker: 1015202
Vulnerability Center: 9647 - [cisco-sa-20051114-ipsec] Cisco IPSec DoS via IKE Traffic, High

Misc.: 🔍
See also: 🔍

Entryinfo

Created: 11/16/2005 12:02
Updated: 06/29/2025 00:44
Changes: 11/16/2005 12:02 (91), 07/05/2019 12:07 (1), 07/02/2024 22:28 (16), 01/24/2025 00:22 (1), 06/29/2025 00:44 (2)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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