CVE-2026-20104

Katalog CVE

CVSS 6.1 · Medium EPSS 0,15%

Kerentanan Buffer Underwrite ('Buffer Underflow') pada cisco ios xe. Skor CVSS 3.1 6.1 (Medium) menurut cisco.com.

Deskripsi (NVD)

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.

Rincian

Terbit di NVD

25 Maret 2026

Terakhir diubah

28 September 2026

Status NVD

Analyzed

CVSS 3.1

6.1 (Medium), sumber cisco.com
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-124: Buffer Underwrite ('Buffer Underflow')

EPSS (30 hari)

0,15% peluang dieksploitasi; lebih tinggi dari 4,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xe-secureboot-bypass-B6... advisory vendor