CVEvulnerability
CVE-2021-34767
7.4 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2021-09-23
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.4 HIGH — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CVSS 3.1 ([email protected])
- 7.4 HIGH — CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CVSS 2.0 ([email protected])
- 3.3 LOW — AV:A/AC:L/Au:N/C:N/I:N/A:P
- Weaknesses
- CWE-670
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.
Affected configurations
• cisco ios xe
• cisco ios xe 3.15.1xbs
• cisco ios xe 3.15.2xbs
• cisco ios xe 16.7.1
• cisco ios xe 16.7.1a
• cisco ios xe 16.7.1b
• cisco ios xe 16.7.2
• cisco ios xe 16.7.3
• cisco ios xe 16.7.4
• cisco ios xe 16.8.1
• cisco ios xe 16.8.1a
• cisco ios xe 16.8.1b
• cisco ios xe 16.8.1c
• cisco ios xe 16.8.1d
• cisco ios xe 16.8.1e
• cisco ios xe 16.8.1s
• cisco ios xe 16.8.2
• cisco ios xe 16.8.3
• cisco ios xe 16.9.1
• cisco ios xe 16.9.1a
• cisco ios xe 16.9.1b
• cisco ios xe 16.9.1c
• cisco ios xe 16.9.1d
• cisco ios xe 16.9.1s
• cisco ios xe 16.9.2
• cisco ios xe 16.9.2a
• cisco ios xe 16.9.2s
• cisco ios xe 16.9.3
• cisco ios xe 16.9.3a
• cisco ios xe 16.9.3h
• cisco ios xe 16.9.3s
• cisco ios xe 16.9.4
• cisco ios xe 16.9.4c
• cisco ios xe 16.9.5
• cisco ios xe 16.9.5f
• cisco ios xe 16.9.6
• cisco ios xe 16.9.7
• cisco ios xe 16.10.1
• cisco ios xe 16.10.1a
• cisco ios xe 16.10.1b
• cisco ios xe 16.10.1c
• cisco ios xe 16.10.1d
• cisco ios xe 16.10.1e
• cisco ios xe 16.10.1f
• cisco ios xe 16.10.1g
• cisco ios xe 16.10.1s
• cisco ios xe 16.10.2
• cisco ios xe 16.10.3
• cisco ios xe 16.11.1
• cisco ios xe 16.11.1a
• cisco ios xe 16.11.1b
• cisco ios xe 16.11.1c
• cisco ios xe 16.11.1s
• cisco ios xe 16.11.2
• cisco ios xe 16.12.1
• cisco ios xe 16.12.1a
• cisco ios xe 16.12.1c
• cisco ios xe 16.12.1s
• cisco ios xe 16.12.1t
• cisco ios xe 16.12.1w
… and 33 more
Related
Weakness · CWE (1)
- CWE-670 Always-Incorrect Control Flow Implementation weakness