Cisco IOS XE Wireless Controller IPv6 Packet control flow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.0$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in Cisco IOS XE Wireless Controller. This vulnerability affects unknown code of the component IPv6 Packet Handler. Such manipulation leads to control flow. This vulnerability is referenced as CVE-2021-34767. The attack needs to be initiated within the local network. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Cisco IOS XE Wireless Controller (Router Operating System) (unknown version). It has been rated as critical. Affected by this issue is an unknown code block of the component IPv6 Packet Handler. The manipulation with an unknown input leads to a control flow vulnerability. Using CWE to declare the problem leads to CWE-670. The code contains a control flow path that does not reflect the algorithm that the path is intended to implement, leading to incorrect behavior any time this path is navigated. Impacted is availability.

The weakness was published 09/23/2021 as cisco-sa-ewlc-ipv6-dos-NMYeCnZv. The advisory is available at tools.cisco.com. This vulnerability is handled as CVE-2021-34767 since 06/15/2021. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/30/2025).

Upgrading eliminates this vulnerability.

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Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.1
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 7.4
NVD Vector: 🔍

CNA Base Score: 7.4
CNA Vector (Cisco Systems, Inc.): 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Control flow
CWE: CWE-670
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/15/2021 🔍
09/23/2021 +100 days 🔍
09/23/2021 +0 days 🔍
10/30/2025 +1498 days 🔍

Sourcesinfo

Vendor: cisco.com

Advisory: cisco-sa-ewlc-ipv6-dos-NMYeCnZv
Status: Confirmed

CVE: CVE-2021-34767 (🔍)
GCVE (CVE): GCVE-0-2021-34767
GCVE (VulDB): GCVE-100-183230
scip Labs: https://www.scip.ch/en/?labs.20150108

Entryinfo

Created: 09/23/2021 10:06
Updated: 10/30/2025 22:47
Changes: 09/23/2021 10:06 (49), 10/01/2021 13:17 (1), 10/30/2025 22:47 (33)
Complete: 🔍
Cache ID: 216::103

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