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Rewterz
Rewterz Threat Advisory – Multiple Cisco Products Vulnerabilities
September 29, 2021
Rewterz
Rewterz Threat Alert – Amadey Botnet – Active IOCs
September 29, 2021

Rewterz Threat Advisory – CVE-2021-34767 – Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers

Severity

High

Analysis Summary

CVE-2021-34767

Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers is vulnerable to a denial of service, caused by a logic error when processing specific link-local IPv6 traffic. By sending a specially-crafted IPv6 packet, a remote attacker could exploit this vulnerability to cause traffic drops in the affected VLAN.

Impact

  • Denial of Service

Affected Vendors

  • Cisco

Affected Products

  • Cisco IOS XE Software
  • Cisco Catalyst 9800 Wireless Controllers
  • Cisco Catalyst 9800 Wireless Controllers for Cloud

Remediation

Refer to Cisco Advisory for patch, upgrade or suggested workaround information.

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ewlc-ipv6-dos-NMYeCnZv