CVE-2024-20434

A vulnerability in Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition on the control plane of an affected device. This vulnerability is due to improper handling of frames with VLAN tag information. An attacker could exploit this vulnerability by sending crafted frames to an affected device. A successful exploit could allow the attacker to render the control plane of the affected device unresponsive. The device would not be accessible through the console or CLI, and it would not respond to ping requests, SNMP requests, or requests from other control plane protocols. Traffic that is traversing the device through the data plane is not affected. A reload of the device is required to restore control plane services.

• CWE-190
• CWE-190

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-vlan-dos-27Pur5RTVendor Advisory

Published

Sep 25, 2024

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2024-20429A vulnerability in the web-based management interface of Cis…7.2
• CVE-2024-2043The EleForms – All In One Form Integration including DB for …5.3
• CVE-2024-20430A vulnerability in Cisco Meraki Systems Manager (SM) Agent f…7.3
• CVE-2024-20431A vulnerability in the geolocation access control feature of…5.8
• CVE-2024-20432A vulnerability in the REST API and web UI of Cisco Nexus Da…8.8
• CVE-2024-20433A vulnerability in the Resource Reservation Protocol (RSVP) …7.5
• CVE-2024-20435A vulnerability in the CLI of Cisco AsyncOS for Secure Web A…7.8
• CVE-2024-20436A vulnerability in the HTTP Server feature of Cisco IOS XE S…7.5
• CVE-2024-20437A vulnerability in the web-based management interface of Cis…8.8
• CVE-2024-20438A vulnerability in the REST API endpoints of Cisco NDFC coul…5.4
• CVE-2024-20439A vulnerability in Cisco Smart Licensing Utility (CSLU) coul…9.8
• CVE-2024-2044pgAdmin <= 8.3 is affected by a path-traversal vulnerability…9.9