CVE-2023-20236
First published: Wed Sep 13 2023(Updated: )
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.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco IOS XR | <7.10.1 | |
| Cisco 8201 | ||
| Cisco 8202 | ||
| Cisco 8208 | ||
| Cisco 8212 | ||
| Cisco 8218 | ||
| Cisco 8804 | ||
| Cisco 8808 | ||
| Cisco 8812 | ||
| Cisco 8818 | ||
| Cisco 8831 | ||
| Cisco ASR 9000 | ||
| Cisco Asr 9000v | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9902 | ||
| Cisco Asr 9903 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9920 | ||
| Cisco Asr 9922 | ||
| Cisco Ncs 1001 | ||
| Cisco Ncs 1002 | ||
| Cisco Ncs 1004 | ||
| Cisco Ncs 4009 | ||
| Cisco Ncs 4016 | ||
| Cisco Ncs 4201 | ||
| Cisco Ncs 4202 | ||
| Cisco Ncs 4206 | ||
| Cisco Ncs 4216 | ||
| Cisco Ncs 5001 | ||
| Cisco Ncs 5002 | ||
| Cisco Ncs 5011 | ||
| Cisco Ncs 540 | ||
| Cisco Ncs 5500 | ||
| Cisco Ncs 5501 | ||
| Cisco Ncs 5501 | =se | |
| Cisco Ncs 5502 | ||
| Cisco Ncs 5502 | =se | |
| Cisco Ncs 5504 | ||
| Cisco Ncs 5508 | ||
| Cisco Ncs 5516 | ||
| Cisco Ncs 560 | ||
| Cisco Ncs 560-4 | ||
| Cisco Ncs 560-7 | ||
| Cisco Ncs 57b1-5dse-sys | ||
| Cisco Ncs 57b1-6d24-sys | ||
| Cisco Ncs 57c1-48q6-sys | ||
| Cisco Ncs 57c3-mod-sys | ||
| Cisco Ncs 57c3-mods-sys | ||
| All of | ||
| Cisco IOS XR | <7.10.1 | |
| Any of | ||
| Cisco 8201 | ||
| Cisco 8202 | ||
| Cisco 8208 | ||
| Cisco 8212 | ||
| Cisco 8218 | ||
| Cisco 8804 | ||
| Cisco 8808 | ||
| Cisco 8812 | ||
| Cisco 8818 | ||
| Cisco 8831 | ||
| Cisco ASR 9000 | ||
| Cisco Asr 9000v | ||
| Cisco Asr 9001 | ||
| Cisco Asr 9006 | ||
| Cisco Asr 9010 | ||
| Cisco Asr 9901 | ||
| Cisco Asr 9902 | ||
| Cisco Asr 9903 | ||
| Cisco Asr 9904 | ||
| Cisco Asr 9906 | ||
| Cisco Asr 9910 | ||
| Cisco Asr 9912 | ||
| Cisco Asr 9920 | ||
| Cisco Asr 9922 | ||
| Cisco Ncs 1001 | ||
| Cisco Ncs 1002 | ||
| Cisco Ncs 1004 | ||
| Cisco Ncs 4009 | ||
| Cisco Ncs 4016 | ||
| Cisco Ncs 4201 | ||
| Cisco Ncs 4202 | ||
| Cisco Ncs 4206 | ||
| Cisco Ncs 4216 | ||
| Cisco Ncs 5001 | ||
| Cisco Ncs 5002 | ||
| Cisco Ncs 5011 | ||
| Cisco Ncs 540 | ||
| Cisco Ncs 5500 | ||
| Cisco Ncs 5501 | ||
| Cisco Ncs 5501 | =se | |
| Cisco Ncs 5502 | ||
| Cisco Ncs 5502 | =se | |
| Cisco Ncs 5504 | ||
| Cisco Ncs 5508 | ||
| Cisco Ncs 5516 | ||
| Cisco Ncs 560 | ||
| Cisco Ncs 560-4 | ||
| Cisco Ncs 560-7 | ||
| Cisco Ncs 57b1-5dse-sys | ||
| Cisco Ncs 57b1-6d24-sys | ||
| Cisco Ncs 57c1-48q6-sys | ||
| Cisco Ncs 57c3-mod-sys | ||
| Cisco Ncs 57c3-mods-sys |
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Reference Links
Frequently Asked Questions
What is CVE-2023-20236?
CVE-2023-20236 is a vulnerability in the iPXE boot function of Cisco IOS XR software that could allow an authenticated, local attacker to install an unverified software image on an affected device.
How severe is CVE-2023-20236?
CVE-2023-20236 has a severity score of 7.8, which is considered high.
What software is affected by CVE-2023-20236?
Cisco IOS XR software up to version 7.10.1 is affected by CVE-2023-20236.
How can an attacker exploit CVE-2023-20236?
An attacker can exploit CVE-2023-20236 by manipulating the image verification process.
Where can I find more information about CVE-2023-20236?
You can find more information about CVE-2023-20236 on the Cisco Security Advisory page: [link](https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-ipxe-sigbypass-pymfyqgB)
- collector/nvd-index
- agent/author
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/last-modified-date
- agent/references
- agent/weakness
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- collector/nvd-api
- source/NVD
- agent/software-canonical-lookup
- vendor/cisco
- canonical/cisco ios xr
- canonical/cisco 8201
- canonical/cisco 8202
- canonical/cisco 8208
- canonical/cisco 8212
- canonical/cisco 8218
- canonical/cisco 8804
- canonical/cisco 8808
- canonical/cisco 8812
- canonical/cisco 8818
- canonical/cisco 8831
- canonical/cisco asr 9000
- canonical/cisco asr 9000v
- canonical/cisco asr 9001
- canonical/cisco asr 9006
- canonical/cisco asr 9010
- canonical/cisco asr 9901
- canonical/cisco asr 9902
- canonical/cisco asr 9903
- canonical/cisco asr 9904
- canonical/cisco asr 9906
- canonical/cisco asr 9910
- canonical/cisco asr 9912
- canonical/cisco asr 9920
- canonical/cisco asr 9922
- canonical/cisco ncs 1001
- canonical/cisco ncs 1002
- canonical/cisco ncs 1004
- canonical/cisco ncs 4009
- canonical/cisco ncs 4016
- canonical/cisco ncs 4201
- canonical/cisco ncs 4202
- canonical/cisco ncs 4206
- canonical/cisco ncs 4216
- canonical/cisco ncs 5001
- canonical/cisco ncs 5002
- canonical/cisco ncs 5011
- canonical/cisco ncs 540
- canonical/cisco ncs 5500
- canonical/cisco ncs 5501
- version/cisco ncs 5501/se
- canonical/cisco ncs 5502
- version/cisco ncs 5502/se
- canonical/cisco ncs 5504
- canonical/cisco ncs 5508
- canonical/cisco ncs 5516
- canonical/cisco ncs 560
- canonical/cisco ncs 560-4
- canonical/cisco ncs 560-7
- canonical/cisco ncs 57b1-5dse-sys
- canonical/cisco ncs 57b1-6d24-sys
- canonical/cisco ncs 57c1-48q6-sys
- canonical/cisco ncs 57c3-mod-sys
- canonical/cisco ncs 57c3-mods-sys