Cisco IOS 10.3 Access Filter privileges management

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Cisco IOS 10.3. This impacts an unknown function of the component Access Filter Handler. The manipulation with the input tacacs-ds/tacac results in privileges management. This vulnerability is cataloged as CVE-1999-0161. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cisco IOS 10.3 (Router Operating System). It has been classified as critical. Affected is an unknown code block of the component Access Filter Handler. The manipulation with the input value tacacs-ds/tacac leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In Cisco IOS 10.3, with the tacacs-ds or tacacs keyword, an extended IP access control list could bypass filtering.

The bug was discovered 07/31/1995. The weakness was shared 07/31/1995 with Cisco (Website). The advisory is shared for download at osvdb.org. This vulnerability is traded as CVE-1999-0161. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability scanner Nessus provides a plugin with the ID 10974 (Cisco IOS tacacs Keyword ACL Bypass (CSCdi36962)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO and relying on port 161. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43080 (Cisco IOS "tacacs" Keyword ACL Bypass Vulnerability).

Upgrading to version 10.3(4.3) eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (1247), Tenable (10974), SecurityFocus (BID 703†), OSVDB (797†) and Vulnerability Center (SBV-2060†). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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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: 7.0

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
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: Privileges management
CWE: CWE-269 / CWE-266
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: 10974
Nessus Name: Cisco IOS tacacs Keyword ACL Bypass (CSCdi36962)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: IOS 10.3(4.3)

Timelineinfo

07/31/1995 🔍
07/31/1995 +0 days 🔍
07/31/1995 +0 days 🔍
07/31/1995 +0 days 🔍
07/31/1995 +0 days 🔍
07/31/1995 +0 days 🔍
06/05/2002 +2501 days 🔍
09/12/2002 +99 days 🔍
09/09/2003 +361 days 🔍
06/17/2014 +3934 days 🔍
04/16/2026 +4321 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: osvdb.org⛔
Organization: Cisco
Status: Confirmed

CVE: CVE-1999-0161 (🔍)
GCVE (CVE): GCVE-0-1999-0161
GCVE (VulDB): GCVE-100-13704

OVAL: 🔍

X-Force: 1247
SecurityFocus: 703 - Cisco IOS tacacs Access List Keyword Vulnerability
OSVDB: 797 - Cisco IOS tacacs Keyword ACL Bypass
Vulnerability Center: 2060 - Cisco IOS \x27tacacs-ds\x27 or \x27tacacs\x27 Keywords Allow Filtering Bypass, High

Entryinfo

Created: 06/17/2014 16:32
Updated: 04/16/2026 07:52
Changes: 06/17/2014 16:32 (62), 01/14/2018 10:32 (12), 06/23/2021 01:21 (3), 10/26/2025 21:07 (18), 04/16/2026 07:52 (1)
Complete: 🔍
Cache ID: 216::103

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