Unrated severityNVD Advisory· Published Sep 13, 2023· Updated Dec 16, 2025

CVE-2023-20236

Description

A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an affected device. This vulnerability is due to insufficient image verification. An attacker could exploit this vulnerability by manipulating the boot parameters for image verification during the iPXE boot process on an affected device. A successful exploit could allow the attacker to boot an unverified software image on the affected device.

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Affected products

Cisco Systems, Inc./iOS Xrllm-fuzzy
Cisco Systems, Inc./iOS Xr Softwarecpe-rescue
Range: 5.2.0

Patches

Vulnerability mechanics

References

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipxe-sigbypass-pymfyqgBmitre

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