CVE-2020-3203

A vulnerability in the locally significant certificate (LSC) provisioning feature of Cisco Catalyst 9800 Series Wireless Controllers that are running Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak that could lead to a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain public key infrastructure (PKI) packets. An attacker could exploit this vulnerability by sending crafted Secure Sockets Layer (SSL) packets to an affected device. A successful exploit could cause an affected device to continuously consume memory, which could result in a memory allocation failure that leads to a crash and causes a DoS condition.

• CWE-400
• CWE-401

• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-ewlc-dos-TkuPVmZNPatch, Vendor Advisory
• https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-ewlc-dos-TkuPVmZNPatch, Vendor Advisory

Published

Jun 3, 2020

Last Modified

Jun 17, 2026

Status

Modified

• 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-2020-3196A vulnerability in the Secure Sockets Layer (SSL)/Transport …8.6
• CVE-2020-3197A vulnerability in the API subsystem of Cisco Meetings App c…5.3
• CVE-2020-3198Multiple vulnerabilities in Cisco IOS Software for Cisco 809…9.8
• CVE-2020-3199Multiple vulnerabilities in the Cisco IOx application enviro…8.8
• CVE-2020-3200A vulnerability in the Secure Shell (SSH) server code of Cis…7.7
• CVE-2020-3201A vulnerability in the Tool Command Language (Tcl) interpret…6
• CVE-2020-3204A vulnerability in the Tool Command Language (Tcl) interpret…6.7
• CVE-2020-3205A vulnerability in the implementation of the inter-VM channe…8.8
• CVE-2020-3206A vulnerability in the handling of IEEE 802.11w Protected Ma…4.7
• CVE-2020-3207A vulnerability in the processing of boot options of specifi…6.7
• CVE-2020-3208A vulnerability in the image verification feature of Cisco I…6.7
• CVE-2020-3209A vulnerability in software image verification in Cisco IOS …6.8