6.7
MEDIUM
CVE-2024-20456
Cisco IOS XR Software Boot Process Privilege Escalation Vulnerability
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.

INFO

Published Date :

July 10, 2024, 4:15 p.m.

Last Modified :

Aug. 4, 2025, 5:44 p.m.

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

0.8
Affected Products

The following products are affected by CVE-2024-20456 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Cisco ios_xr
2 Cisco 8201
3 Cisco 8202
4 Cisco 8101-32fh
5 Cisco 8102-64h
6 Cisco 8201-32fh
7 Cisco 8804
8 Cisco 8808
9 Cisco 8812
10 Cisco 8818
11 Cisco ncs_540-12z20g-sys-a
12 Cisco ncs_540-12z20g-sys-d
13 Cisco ncs_540-24z8q2c-sys
14 Cisco ncs_540-28z4c-sys-a
15 Cisco ncs_540-28z4c-sys-d
16 Cisco ncs_540-acc-sys
17 Cisco ncs_540x-12z16g-sys-a
18 Cisco ncs_540x-12z16g-sys-d
19 Cisco ncs_540x-16z4g8q2c-a
20 Cisco ncs_540x-16z4g8q2c-d
21 Cisco ncs_540x-acc-sys
22 Cisco ncs_57b1-5dse-sys
23 Cisco ncs_57b1-6d24-sys
24 Cisco ncs_57c1-48q6-sys
25 Cisco ncs_1010
26 Cisco ncs_1014
27 Cisco ncs_540-24q2c2dd-sys
28 Cisco ncs_540-24q8l2dd-sys
29 Cisco ncs_540-6z14s-sys-d
30 Cisco ncs_540-6z18g-sys-a
31 Cisco ncs_540-6z18g-sys-d
32 Cisco ncs_540-fh-agg
33 Cisco ncs_540-fh-csr-sys
34 Cisco ncs_540x-16z8q2c-d
35 Cisco ncs_540x-4z14g2q-a
36 Cisco ncs_540x-4z14g2q-d
37 Cisco ncs_540x-6z18g-sys-a
38 Cisco ncs_540x-6z18g-sys-d
39 Cisco ncs_540x-8z16g-sys-a
40 Cisco ncs_540x-8z16g-sys-d
41 Cisco ncs_57d2-18dd-sys
42 Cisco 8608
43 Cisco 8011-4g24y4h-i
44 Cisco 8101-32fh-o
45 Cisco 8101-32h-o
46 Cisco 8102-28fh-dpu-o
47 Cisco 8102-64h-o
48 Cisco 8111-32eh-o
49 Cisco 8122-64eh-o
50 Cisco 8122-64ehf-o
51 Cisco 8201-24h8fh
52 Cisco 8201-32fh-o
53 Cisco 8202-32fh-m
54 Cisco 8212-48fh-m
55 Cisco 8404
56 Cisco 8501-sys-mt
57 Cisco 8700
58 Cisco 8711-32fh-m
59 Cisco 8712-mod-m
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2024-20456.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-20456 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-20456 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Aug. 04, 2025

    Action Type Old Value New Value
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:24.2.1:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:ncs_540-12z20g-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-12z20g-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-24z8q2c-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-28z4c-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-28z4c-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-acc-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8101-32fh:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8102-64h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8201:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8808:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8812:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8818:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-12z16g-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-12z16g-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-16z4g8q2c-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-16z4g8q2c-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-acc-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8011-4g24y4h-i:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8201-32fh:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8608:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8804:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1010:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_1014:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-6z14s-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-6z18g-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-6z18g-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-24q2c2dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-24q8l2dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-fh-agg:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-fh-csr-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-4z14g2q-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-4z14g2q-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-6z18g-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-6z18g-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-8z16g-sys-a:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-8z16g-sys-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-16z8q2c-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_57b1-5dse-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_57b1-6d24-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_57c1-48q6-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_57d2-18dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8101-32fh-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8101-32h-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8102-28fh-dpu-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8102-64h-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8111-32eh-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8122-64eh-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8122-64ehf-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8201-24h8fh:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202-32fh-m:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8201-32fh-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8212-48fh-m:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8404:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8501-sys-mt:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8700:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8711-32fh-m:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8712-mod-m:-:*:*:*:*:*:*:*
    Added Reference Type CVE: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap Types: Vendor Advisory
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap Types: Vendor Advisory
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap
  • CVE Received by [email protected]

    Jul. 10, 2024

    Action Type Old Value New Value
    Added 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.
    Added Reference Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-xr-secure-boot-quD5g8Ap [No types assigned]
    Added CWE Cisco Systems, Inc. CWE-732
    Added CVSS V3.1 Cisco Systems, Inc. AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability