CVE-2024-20456

MEDIUM

6.7

CVSS Score

Published: July 10, 2024 at 04:06 PM UTC

Updated: June 17, 2026 at 07:07 AM UTC

59 products affected across 1 vendorIOS Xr82018202

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Severity

MEDIUM6.7

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

A vulnerability in the boot process of Cisco IOS XR Software could allow an authenticated, local attacker with high privileges to bypass the Cisco Secure Boot functionality and load unverified software on an affected device. To exploit this successfully, the attacker must have root-system privileges on the affected device. This vulnerability is due to an error in the software build process. An attacker could exploit this vulnerability by manipulating the system’s configuration options to bypass some of the integrity checks that are performed during the booting process. A successful exploit could allow the attacker to control the boot configuration, which could enable them to bypass of the requirement to run Cisco signed images or alter the security properties of the running system.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

IOS Xr · Cisco

95%

24.2.1

cisco-8011-4g24y4h-i (environment) · cisco-8101-32fh (environment) · cisco-8101-32fh-o (environment) · cisco-8101-32h-o (environment) · cisco-8102-28fh-dpu-o (environment) · cisco-8102-64h (environment) · cisco-8102-64h-o (environment) · cisco-8111-32eh-o (environment) · cisco-8122-64eh-o (environment) · cisco-8122-64ehf-o (environment) · cisco-8201 (environment) · cisco-8201-24h8fh (environment) · cisco-8201-32fh (environment) · cisco-8201-32fh-o (environment) · cisco-8202 (environment) · cisco-8202-32fh-m (environment) · cisco-8212-48fh-m (environment) · cisco-8404 (environment) · cisco-8501-sys-mt (environment) · cisco-8608 (environment) · cisco-8700 (environment) · cisco-8711-32fh-m (environment) · cisco-8712-mod-m (environment) · cisco-8804 (environment) · cisco-8808 (environment) · cisco-8812 (environment) · cisco-8818 (environment) · cisco-ncs-1010 (environment) · cisco-ncs-1014 (environment) · cisco-ncs-540-12z20g-sys-a (environment) · cisco-ncs-540-12z20g-sys-d (environment) · cisco-ncs-540-24q2c2dd-sys (environment) · cisco-ncs-540-24q8l2dd-sys (environment) · cisco-ncs-540-24z8q2c-sys (environment) · cisco-ncs-540-28z4c-sys-a (environment) · cisco-ncs-540-28z4c-sys-d (environment) · cisco-ncs-540-6z14s-sys-d (environment) · cisco-ncs-540-6z18g-sys-a (environment) · cisco-ncs-540-6z18g-sys-d (environment) · cisco-ncs-540-acc-sys (environment) · cisco-ncs-540-fh-agg (environment) · cisco-ncs-540-fh-csr-sys (environment) · cisco-ncs-540x-12z16g-sys-a (environment) · cisco-ncs-540x-12z16g-sys-d (environment) · cisco-ncs-540x-16z4g8q2c-a (environment) · cisco-ncs-540x-16z4g8q2c-d (environment) · cisco-ncs-540x-16z8q2c-d (environment) · cisco-ncs-540x-4z14g2q-a (environment) · cisco-ncs-540x-4z14g2q-d (environment) · cisco-ncs-540x-6z18g-sys-a (environment) · cisco-ncs-540x-6z18g-sys-d (environment) · cisco-ncs-540x-8z16g-sys-a (environment) · cisco-ncs-540x-8z16g-sys-d (environment) · cisco-ncs-540x-acc-sys (environment) · cisco-ncs-57b1-5dse-sys (environment) · cisco-ncs-57b1-6d24-sys (environment) · cisco-ncs-57c1-48q6-sys (environment) · cisco-ncs-57d2-18dd-sys (environment)

8011-4G24Y4H-I · Ciscodevice

80%

All versions

8101-32Fh · Ciscodevice

80%

All versions

8101-32Fh-O · Ciscodevice

80%

All versions

8101-32H-O · Ciscodevice

80%

All versions