CVE-2021-34767
"Cisco Catalyst 9000 Family Wireless Controllers IPv6 Traffic Processing L2 Loop DOS"
Description
A vulnerability in IPv6 traffic processing of Cisco IOS XE Wireless Controller Software for Cisco Catalyst 9000 Family Wireless Controllers could allow an unauthenticated, adjacent attacker to cause a Layer 2 (L2) loop in a configured VLAN, resulting in a denial of service (DoS) condition for that VLAN. The vulnerability is due to a logic error when processing specific link-local IPv6 traffic. An attacker could exploit this vulnerability by sending a crafted IPv6 packet that would flow inbound through the wired interface of an affected device. A successful exploit could allow the attacker to cause traffic drops in the affected VLAN, thus triggering the DoS condition.
INFO
Published Date :
Sept. 23, 2021, 3:15 a.m.
Last Modified :
Nov. 21, 2024, 6:11 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
4.0
Exploitability Score :
2.8
Public PoC/Exploit Available at Github
CVE-2021-34767 has a 1 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-34767
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-34767.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers IPv6 Denial of Service Vulnerability
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-34767 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-34767 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Nov. 21, 2024
Action Type Old Value New Value Added Reference https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv -
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Removed CVSS V3 Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Added CVSS V3.1 Cisco Systems, Inc. AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H -
Initial Analysis by [email protected]
Oct. 13, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:A/AC:L/Au:N/C:N/I:N/A:P) Added CVSS V3.1 NIST AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H Changed Reference Type https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv No Types Assigned https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv Vendor Advisory Added CWE NIST CWE-670 Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xe:*:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:3.15.1xbs:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:3.15.2xbs:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.7.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1e:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.8.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.2a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.2s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.3a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.3h:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.3s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.4c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.5:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.5f:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.6:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.9.7:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1d:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1e:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1f:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1g:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.10.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1b:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.11.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1c:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1t:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1w:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1x:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1y:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1z:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1z1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.1za:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.2t:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.3a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.3s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.4:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:16.12.4a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1s:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.1t:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.1.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1r:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.1v:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.2.3:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1a:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1w:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1x:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.1z:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xe:17.3.2a:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:catalyst_9800:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-40:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-80:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-cl:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-l:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-l-c:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800-l-f:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:catalyst_9800_embedded_wireless_controller:-:*:*:*:*:*:*:*
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-34767 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-34767
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.06 }} 0.01%
score
0.23102
percentile