CVE-2023-20236

HIGH

7.8

CVSS Score

Published: September 13, 2023 at 04:39 PM UTC

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

52 products affected across 1 vendorIOS XrAsr 9010Asr 9904

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

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.

Affected

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

IOS Xr · Cisco

95%

Affected range stops below 7.10.1, so it looks safe — our inference, not a vendor statement

cisco-8201 (environment) · cisco-8202 (environment) · cisco-8208 (environment) · cisco-8212 (environment) · cisco-8218 (environment) · cisco-8804 (environment) · cisco-8808 (environment) · cisco-8812 (environment) · cisco-8818 (environment) · cisco-8831 (environment) · cisco-asr-9000 (environment) · cisco-asr-9000v (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-9920 (environment) · cisco-asr-9922 (environment) · cisco-ncs-1001 (environment) · cisco-ncs-1002 (environment) · cisco-ncs-1004 (environment) · cisco-ncs-4009 (environment) · cisco-ncs-4016 (environment) · cisco-ncs-4201 (environment) · cisco-ncs-4202 (environment) · cisco-ncs-4206 (environment) · cisco-ncs-4216 (environment) · cisco-ncs-5001 (environment) · cisco-ncs-5002 (environment) · cisco-ncs-5011 (environment) · cisco-ncs-540 (environment) · cisco-ncs-5500 (environment) · cisco-ncs-5501 (environment) · cisco-ncs-5502 (environment) · cisco-ncs-5504 (environment) · cisco-ncs-5508 (environment) · cisco-ncs-5516 (environment) · cisco-ncs-560 (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)

8201 · Ciscodevice

80%

All versions

8202 · Ciscodevice

80%

All versions

8208 · Ciscodevice

80%

All versions

8212 · Ciscodevice

80%

All versions