VDB-11208 · CVE-2013-6683 · BID 63685

Cisco NX-OS IPv6 Neighbor Table Processor input validation

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability, which was classified as critical, was found in Cisco NX-OS (Router Operating System) (affected version unknown). Affected is an unknown functionality of the component IPv6 Neighbor Table Processor. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on availability. CVE summarizes:

The IPv6 implementation in Cisco NX-OS does not properly handle neighbor-table adjacencies, which allows remote attackers to cause a denial of service (NS processing outage) via a series of malformed packets, aka Bug ID CSCtd15904.

The weakness was presented 11/12/2013 as Cisco Nexus 4000 Series Switches IPv6 Denial of Service Vulnerability as confirmed advisory (Website). The advisory is shared for download at tools.cisco.com. The public release was coordinated in cooperation with the vendor. This vulnerability is traded as CVE-2013-6683 since 11/07/2013. The exploitability is told to be easy. The attack can only be done within the local network. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 71153 (Cisco Nexus 4000 Series Switches IPv6 Denial of Service (CSCtd15904)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CISCO.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (71153). Further details are available at tools.cisco.com.






CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍



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

NVD Base Score: 🔍


Class: Input validation
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Nessus ID: 71153
Nessus Name: Cisco Nexus 4000 Series Switches IPv6 Denial of Service (CSCtd15904)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍

Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

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


11/07/2013 🔍
11/12/2013 +5 days 🔍
11/12/2013 +0 days 🔍
11/12/2013 +0 days 🔍
11/13/2013 +1 days 🔍
11/19/2013 +6 days 🔍
11/25/2013 +6 days 🔍
12/02/2013 +7 days 🔍
06/02/2021 +2739 days 🔍


Vendor: cisco.com

Advisory: Cisco Nexus 4000 Series Switches IPv6 Denial of Service Vulnerability
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2013-6683 (🔍)
Vulnerability Center: 42356 - Cisco NX-OS 4.1(2)E1(1j) and Prior Remote Denial of Service via Malformed Packets, High
SecurityFocus: 63685
OSVDB: 99749

Misc.: 🔍


Created: 11/19/2013 09:37 AM
Updated: 06/02/2021 10:00 AM
Changes: 11/19/2013 09:37 AM (45), 05/15/2017 11:53 AM (23), 06/02/2021 10:00 AM (3)
Complete: 🔍


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