Attacker Value
Unknown
(0 users assessed)
Exploitability
Unknown
(0 users assessed)
User Interaction
None
Privileges Required
None
Attack Vector
Adjacent_network
0

CVE-2021-34767

Disclosure Date: September 22, 2021 •
CVE-2021-34767 CVSS v3 Base Score: 7.4
Add MITRE ATT&CK tactics and techniques that apply to this CVE.

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.

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CVSS V3 Severity and Metrics
Base Score:
7.4 High
Impact Score:
4
Exploitability Score:
2.8
Vector:
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector (AV):
Adjacent_network
Attack Complexity (AC):
Low
Privileges Required (PR):
None
User Interaction (UI):
None
Scope (S):
Changed
Confidentiality (C):
None
Integrity (I):
None
Availability (A):
High

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Cisco IOS XE Software n/a
Prerequisites
Unknown
Discovered By
Unknown
PoC Author
Unknown
Metasploit Module
Unknown
Reporter
Unknown

Vendors

  • cisco

Products

  • ios xe,
  • ios xe 16.10.1,
  • ios xe 16.10.1a,
  • ios xe 16.10.1b,
  • ios xe 16.10.1c,
  • ios xe 16.10.1d,
  • ios xe 16.10.1e,
  • ios xe 16.10.1f,
  • ios xe 16.10.1g,
  • ios xe 16.10.1s,
  • ios xe 16.10.2,
  • ios xe 16.10.3,
  • ios xe 16.11.1,
  • ios xe 16.11.1a,
  • ios xe 16.11.1b,
  • ios xe 16.11.1c,
  • ios xe 16.11.1s,
  • ios xe 16.11.2,
  • ios xe 16.12.1,
  • ios xe 16.12.1a,
  • ios xe 16.12.1c,
  • ios xe 16.12.1s,
  • ios xe 16.12.1t,
  • ios xe 16.12.1w,
  • ios xe 16.12.1x,
  • ios xe 16.12.1y,
  • ios xe 16.12.1z,
  • ios xe 16.12.1z1,
  • ios xe 16.12.1za,
  • ios xe 16.12.2,
  • ios xe 16.12.2a,
  • ios xe 16.12.2s,
  • ios xe 16.12.2t,
  • ios xe 16.12.3,
  • ios xe 16.12.3a,
  • ios xe 16.12.3s,
  • ios xe 16.12.4,
  • ios xe 16.12.4a,
  • ios xe 16.7.1,
  • ios xe 16.7.1a,
  • ios xe 16.7.1b,
  • ios xe 16.7.2,
  • ios xe 16.7.3,
  • ios xe 16.7.4,
  • ios xe 16.8.1,
  • ios xe 16.8.1a,
  • ios xe 16.8.1b,
  • ios xe 16.8.1c,
  • ios xe 16.8.1d,
  • ios xe 16.8.1e,
  • ios xe 16.8.1s,
  • ios xe 16.8.2,
  • ios xe 16.8.3,
  • ios xe 16.9.1,
  • ios xe 16.9.1a,
  • ios xe 16.9.1b,
  • ios xe 16.9.1c,
  • ios xe 16.9.1d,
  • ios xe 16.9.1s,
  • ios xe 16.9.2,
  • ios xe 16.9.2a,
  • ios xe 16.9.2s,
  • ios xe 16.9.3,
  • ios xe 16.9.3a,
  • ios xe 16.9.3h,
  • ios xe 16.9.3s,
  • ios xe 16.9.4,
  • ios xe 16.9.4c,
  • ios xe 16.9.5,
  • ios xe 16.9.5f,
  • ios xe 16.9.6,
  • ios xe 16.9.7,
  • ios xe 17.1.1,
  • ios xe 17.1.1a,
  • ios xe 17.1.1s,
  • ios xe 17.1.1t,
  • ios xe 17.1.2,
  • ios xe 17.1.3,
  • ios xe 17.2.1,
  • ios xe 17.2.1a,
  • ios xe 17.2.1r,
  • ios xe 17.2.1v,
  • ios xe 17.2.2,
  • ios xe 17.2.3,
  • ios xe 17.3.1,
  • ios xe 17.3.1a,
  • ios xe 17.3.1w,
  • ios xe 17.3.1x,
  • ios xe 17.3.1z,
  • ios xe 17.3.2,
  • ios xe 17.3.2a,
  • ios xe 3.15.1xbs,
  • ios xe 3.15.2xbs

Additional Info

Authenticated
Unknown
Exploitable
Unknown
Reliability
Unknown
Stability
Unknown
Available Mitigations
Unknown
Shelf Life
Unknown
Userbase/Installbase
Unknown
Patch Effectiveness
Unknown
Technical Analysis