CVE-2023-20064

Cisco IOS XR Software Bootloader Unauthenticated Information Disclosure Vulnerability

MEDIUM

4.6

CVSS Score

Published: March 9, 2023 at 12:00 AM UTC

Updated: June 17, 2026 at 05:29 AM UTC

40 products affected across 1 vendorIOS XrAsr 9010Asr 9904

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Severity

MEDIUM4.6

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A vulnerability in the GRand Unified Bootloader (GRUB) for Cisco IOS XR Software could allow an unauthenticated attacker with physical access to the device to view sensitive files on the console using the GRUB bootloader command line. This vulnerability is due to the inclusion of unnecessary commands within the GRUB environment that allow sensitive files to be viewed. An attacker could exploit this vulnerability by being connected to the console port of the Cisco IOS XR device when the device is power-cycled. A successful exploit could allow the attacker to view sensitive files that could be used to conduct additional attacks against the device.

Affected

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

IOS Xr · Cisco

95%

v < 7.6.1v < 7.7.1v < 7.9.1

Affected range stops below 7.6.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.7.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.9.1, so it looks safe — our inference, not a vendor statement

cisco-asr-9000v-v2 (environment) · cisco-asr-9001 (environment) · cisco-asr-9006 (environment) · cisco-asr-9010 (environment) · cisco-asr-9901 (environment) · cisco-asr-9902 (environment) · cisco-asr-9903 (environment) · cisco-asr-9904 (environment) · cisco-asr-9906 (environment) · cisco-asr-9910 (environment) · cisco-asr-9912 (environment) · cisco-asr-9922 (environment) · cisco-nc57-18dd-se (environment) · cisco-nc57-24dd (environment) · cisco-nc57-36h-se (environment) · cisco-nc57-36h6d-s (environment) · cisco-ncs-1001 (environment) · cisco-ncs-1002 (environment) · cisco-ncs-1004 (environment) · cisco-ncs-5001 (environment) · cisco-ncs-5002 (environment) · cisco-ncs-5011 (environment) · cisco-ncs-540 (environment) · cisco-ncs-540-fronthaul (environment) · cisco-ncs-5501 (environment) · cisco-ncs-5501-se (environment) · cisco-ncs-5502 (environment) · cisco-ncs-5502-se (environment) · cisco-ncs-5508 (environment) · cisco-ncs-5516 (environment) · cisco-ncs-560-4 (environment) · cisco-ncs-560-7 (environment) · cisco-ncs-57b1-5dse-sys (environment) · cisco-ncs-57b1-6d24-sys (environment) · cisco-ncs-57c1-48q6-sys (environment) · cisco-ncs-57c3-mod-sys (environment) · cisco-ncs-57c3-mods-sys (environment) · cisco-ncs-6000 (environment) · cisco-ios-xrv-9000 (same device)

Asr 9000V-V2 · Ciscodevice

80%

All versions

Asr 9001 · Ciscodevice

80%

All versions

Asr 9006 · Ciscodevice

80%

All versions

Asr 9010 · Ciscodevice

80%

All versions