Cisco IOS 8.2/8.3/9.0/9.1 Access List 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 has been found in Cisco IOS 8.2/8.3/9.0/9.1 and classified as critical. This affects an unknown part of the component Access List Handler. Performing a manipulation results in privileges management. This vulnerability was named CVE-1999-1466. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Cisco IOS 8.2/8.3/9.0/9.1 (Router Operating System). This affects an unknown part of the component Access List Handler. The manipulation with an unknown input 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. The summary by CVE is:

Vulnerability in Cisco routers versions 8.2 through 9.1 allows remote attackers to bypass access control lists when extended IP access lists are used on certain interfaces, the IP route cache is enabled, and the access list uses the "established" keyword.

The weakness was presented 12/10/1992 as CSCdi34061 as confirmed advisory (Website). The advisory is shared at cert.org. This vulnerability is uniquely identified as CVE-1999-1466. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 10973 (Cisco IOS established Keyword ACL Bypass (CSCdi34061)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO. The commercial vulnerability scanner Qualys is able to test this issue with plugin 43079 (Cisco IOS "Established" Keyword ACL Bypass Vulnerability).

Upgrading to version 8.3, 9.0 or 9.1 eliminates this vulnerability. It is possible to mitigate the problem by applying the configuration setting no ip route-cache. 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 X-Force (1248), Tenable (10973), SecurityFocus (BID 53†) and Vulnerability Center (SBV-2058†). See VDB-13652 and VDB-14213 for similar entries. 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: 7.3
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: 🔍
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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: 10973
Nessus Name: Cisco IOS established Keyword ACL Bypass (CSCdi34061)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍

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 8.3/9.0/9.1
Config: no ip route-cache

Timelineinfo

12/10/1992 🔍
12/10/1992 +0 days 🔍
12/10/1992 +0 days 🔍
12/10/1992 +0 days 🔍
09/01/1998 +2091 days 🔍
09/09/2003 +1834 days 🔍
06/17/2014 +3934 days 🔍
10/26/2025 +4149 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: CSCdi34061
Status: Confirmed

CVE: CVE-1999-1466 (🔍)
GCVE (CVE): GCVE-0-1999-1466
GCVE (VulDB): GCVE-100-13653
X-Force: 1248 - Cisco IOS access control list using the \
SecurityFocus: 53 - Cisco Access List Vulnerability
Vulnerability Center: 2058 - [cisco-sa-19950601-key-packet-bypass] Cisco IOS established Keyword Allows Filtering Bypass, Low

See also: 🔍

Entryinfo

Created: 06/17/2014 12:34
Updated: 10/26/2025 21:07
Changes: 06/17/2014 12:34 (64), 01/13/2018 12:44 (6), 06/23/2021 00:51 (4), 10/26/2025 21:07 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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