CVE-2026-20104

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A vulnerability in the bootloader of Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches, Cisco Catalyst ESS9300 Embedded Series Switches, Cisco Catalyst IE9310 and IE9320 Rugged Series Switches, and Cisco IE3500 and IE3505 Rugged Series Switches could allow an authenticated, local attacker with level-15 privileges or an unauthenticated attacker with physical access to an affected device to execute arbitrary code at boot time and break the chain of trust. This vulnerability is due to insufficient validation of software at boot time. An attacker could exploit this vulnerability by manipulating the loaded binaries on an affected device to bypass some of the integrity checks that are performed during the boot process. A successful exploit could allow the attacker to execute code that bypasses the requirement to run Cisco-signed images. Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates because this vulnerability allows an attacker to bypass a major security feature of a device.

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

缓冲区下溢

Cisco多款产品 安全漏洞

Cisco Catalyst 9200 Series Switches是美国思科（Cisco）公司的一款交换机。Cisco Catalyst是美国思科（Cisco）公司的一系列交换机。是 Cisco多款产品存在安全漏洞，该漏洞源于启动时软件验证不足，可能导致执行任意代码并破坏信任链。以下产品受到影响：Cisco IOS XE Software for Cisco Catalyst 9200 Series Switches、Cisco Catalyst ESS9300 Embedded Series Swi

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