Cisco IOS up to 12.2t improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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7.3$5k-$25k0.00

Summaryinfo

A vulnerability was found in Cisco IOS up to 12.2t. It has been rated as problematic. This vulnerability affects unknown code. The manipulation leads to improper authentication. This vulnerability is referenced as CVE-2005-2105. No exploit is available.

Detailsinfo

A vulnerability was found in Cisco IOS up to 12.2t (Router Operating System) and classified as critical. This issue affects an unknown function. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Cisco IOS 12.2T through 12.4 allows remote attackers to bypass Authentication, Authorization, and Accounting (AAA) RADIUS authentication, if the fallback method is set to none, via a long username.

The bug was discovered 06/29/2005. The weakness was published 07/05/2005 (Website). It is possible to read the advisory at cisco.com. The identification of this vulnerability is CVE-2005-2105 since 07/01/2005. The exploitation is known to be easy. 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 pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 06/30/2025).

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 20933 (Cisco IOS AAA RADIUS Long Username Authentication Bypass (CSCee45312)), 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 43095 (Cisco IOS AAA RADIUS Authentication Bypass Vulnerability).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (21190), Tenable (20933), SecurityFocus (BID 14092†), OSVDB (17644†) and SecurityTracker (ID 1014330†). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
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: 20933
Nessus Name: Cisco IOS AAA RADIUS Long Username Authentication Bypass (CSCee45312)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/29/2005 🔍
06/29/2005 +0 days 🔍
06/29/2005 +0 days 🔍
07/01/2005 +2 days 🔍
07/05/2005 +4 days 🔍
07/05/2005 +0 days 🔍
07/05/2005 +0 days 🔍
02/17/2006 +227 days 🔍
03/11/2015 +3309 days 🔍
06/30/2025 +3764 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco.com
Status: Not defined

CVE: CVE-2005-2105 (🔍)
GCVE (CVE): GCVE-0-2005-2105
GCVE (VulDB): GCVE-100-25655

OVAL: 🔍

X-Force: 21190
SecurityFocus: 14092 - Cisco IOS AAA RADIUS Authentication Bypass Vulnerability
OSVDB: 17644 - CVE-2005-2105 - Cisco - IOS - Authentication Bypass Issue
SecurityTracker: 1014330
Vulnerability Center: 8513 - [cisco-sa-20050629-aaa] RADIUS Authentication Bypass in Cisco IOS 12.2 - 12.4 via Long Username, High

Entryinfo

Created: 03/11/2015 11:41
Updated: 06/30/2025 07:20
Changes: 03/11/2015 11:41 (65), 06/04/2019 20:39 (5), 03/03/2025 00:02 (17), 06/30/2025 07:20 (2)
Complete: 🔍
Cache ID: 216::103

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

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