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A vulnerability in the TLS library of Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to exhaust the available memory of an affected device.
 This vulnerability is due to improper management of memory resources during TLS connection setup. An attacker could exploit this vulnerability by repeatedly triggering the conditions that cause the memory increase. This could be done in a variety of ways, such as by repeatedly attempting Extensible Authentication Protocol (EAP) authentication when local EAP is enabled on an affected device or by using a machine-in-the-middle attack and resetting TLS connections between the affected device and other devices. A successful exploit could allow the attacker to exhaust the available memory on an affected device, resulting in an unexpected reload and a denial of service (DoS) condition.

CVE-2026-20004 is a vulnerability identified in the TLS library of Cisco IOS XE Software, impacting numerous versions spanning from 16.9.1 to 17.16.1a. The root cause is improper memory resource management during the TLS handshake process, specifically when establishing TLS connections. An attacker with adjacent network access can exploit this flaw by repeatedly initiating conditions that cause incremental memory allocation without proper release. For example, repeatedly triggering Extensible Authentication Protocol (EAP) authentication attempts when local EAP is enabled or performing man-in-the-middle attacks to reset TLS connections can induce continuous memory consumption. This memory exhaustion can lead to the affected device unexpectedly reloading, resulting in a denial of service (DoS). The vulnerability requires no authentication or user interaction, making it easier to exploit in environments where attackers have adjacent network access. The CVSS v3.1 base score is 7.4, reflecting high severity due to the impact on availability and the ease of exploitation. The scope is considered changed (S:C) because the vulnerability affects the entire device operation. No known exploits have been reported in the wild yet, but the broad range of affected versions and the critical role of Cisco IOS XE in network infrastructure underscore the importance of addressing this issue promptly.

Detailed information about CVE-2026-20004: Missing Reference to Active Allocated Resource in Cisco Cisco IOS XE Software affecting Cisco Cisco IOS XE Software. 

CVE-2026-20004: Missing Reference to Active Allocated Resource in Cisco Cisco IOS XE Software - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-20004: Missing Reference to Active Allocated Resource in Cisco Cisco IOS XE Software

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