Memory Exhaustion Vulnerability in Cisco IOS XE Software TLS Library

CVE-2026-20004

What is CVE-2026-20004?

A vulnerability in the TLS library of Cisco IOS XE Software allows attackers to execute denial of service (DoS) attacks by exploiting improper memory management during TLS connection setups. By triggering repeated conditions, such as through EAP authentication or man-in-the-middle tactics, an attacker can exhaust the device's memory, potentially forcing it into an unexpected reload. This exploitation could critically impact the performance and reliability of network services.

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