5.8
MEDIUM
CVE-2024-20322
Cisco IOS XR Software Pseudowire ACL Bypass Vulnerability
Description

A vulnerability in the access control list (ACL) processing on Pseudowire interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to improper assignment of lookup keys to internal interface contexts. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to access resources behind the affected device that were supposed to be protected by a configured ACL.

INFO

Published Date :

March 13, 2024, 5:15 p.m.

Last Modified :

Aug. 5, 2025, 2:41 p.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

1.4

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2024-20322 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 ncs_5501-se
5 Cisco ncs_5502-se
6 Cisco ncs_5504
7 Cisco ncs_5508
8 Cisco ncs_5516
9 Cisco 8101-32fh
10 Cisco 8102-64h
11 Cisco 8201-32fh
12 Cisco 8804
13 Cisco 8808
14 Cisco 8812
15 Cisco 8818
16 Cisco ncs_5501
17 Cisco ncs_5502
18 Cisco ncs_540-12z20g-sys-a
19 Cisco ncs_540-12z20g-sys-d
20 Cisco ncs_540-24z8q2c-sys
21 Cisco ncs_540-28z4c-sys-a
22 Cisco ncs_540-28z4c-sys-d
23 Cisco ncs_540-acc-sys
24 Cisco ncs_540x-12z16g-sys-a
25 Cisco ncs_540x-12z16g-sys-d
26 Cisco ncs_540x-16z4g8q2c-a
27 Cisco ncs_540x-16z4g8q2c-d
28 Cisco ncs_540x-acc-sys
29 Cisco ncs_560-4
30 Cisco ncs_560-7
31 Cisco ncs_57b1-5dse-sys
32 Cisco ncs_57b1-6d24-sys
33 Cisco ncs_57c1-48q6-sys
34 Cisco ncs_57c3-mod-sys
35 Cisco ncs_540-24q2c2dd-sys
36 Cisco ncs_540-24q8l2dd-sys
37 Cisco ncs_540-6z14s-sys-d
38 Cisco ncs_540-6z18g-sys-a
39 Cisco ncs_540-6z18g-sys-d
40 Cisco ncs_540-fh-agg
41 Cisco ncs_540-fh-csr-sys
42 Cisco ncs_540x-16z8q2c-d
43 Cisco ncs_540x-4z14g2q-a
44 Cisco ncs_540x-4z14g2q-d
45 Cisco ncs_540x-6z18g-sys-a
46 Cisco ncs_540x-6z18g-sys-d
47 Cisco ncs_540x-8z16g-sys-a
48 Cisco ncs_540x-8z16g-sys-d
49 Cisco ncs_57d2-18dd-sys
50 Cisco 8608
51 Cisco 8011-4g24y4h-i
52 Cisco 8101-32fh-o
53 Cisco 8101-32h-o
54 Cisco 8102-28fh-dpu-o
55 Cisco 8102-64h-o
56 Cisco 8111-32eh-o
57 Cisco 8122-64eh-o
58 Cisco 8122-64ehf-o
59 Cisco 8201-24h8fh
60 Cisco 8201-32fh-o
61 Cisco 8202-32fh-m
62 Cisco 8212-48fh-m
63 Cisco 8404
64 Cisco 8501-sys-mt
65 Cisco 8700
66 Cisco 8711-32fh-m
67 Cisco 8712-mod-m
68 Cisco ncs_55a1-24h
69 Cisco ncs_55a1-24q6h-s
70 Cisco ncs_55a1-24q6h-ss
71 Cisco ncs_55a1-36h
72 Cisco ncs_55a1-36h-se
73 Cisco ncs_55a1-48q6h
74 Cisco ncs_55a2-mod-hd-s
75 Cisco ncs_55a2-mod-s
76 Cisco ncs_55a2-mod-se-s
: Total Affected Vendor : 1 | Products : 76
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-2024-20322.

URL Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-acl-bypass-RZU5NL3e Vendor Advisory
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-acl-bypass-RZU5NL3e 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-2024-20322 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-20322 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. 05, 2025

    Action Type Old Value New Value
    Added CPE Configuration AND OR *cpe:2.3:o:cisco:ios_xr:7.10.2:*:*:*:*:*:*:* *cpe:2.3:o:cisco:ios_xr:7.11:*:*:*:*:*:*:* OR cpe:2.3:h:cisco:ncs_5501:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5501-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5502:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5502-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5508:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5516:-:*:*:*:*:*:*:* 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: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:8202:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-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:8201-32fh:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8608:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8804:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8808:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8812:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8818:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-24q2c2dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-24q8l2dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-6z14s-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-fh-agg:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_5504:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_560-4:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_560-7:-:*:*:*:*:*:*:* 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_57c3-mod-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540-fh-csr-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_540x-16z8q2c-d:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8011-4g24y4h-i:-:*:*:*:*:*:*:* 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:8201-32fh-o:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:8202-32fh-m:-:*:*:*:*:*:*:* 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:-:*:*:*:*:*:*:* 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_57d2-18dd-sys:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-24h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-24q6h-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-24q6h-ss:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-36h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-36h-se:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a1-48q6h:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2-mod-hd-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2-mod-s:-:*:*:*:*:*:*:* cpe:2.3:h:cisco:ncs_55a2-mod-se-s:-:*:*:*:*:*:*:*
    Added Reference Type CVE: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-acl-bypass-RZU5NL3e Types: Vendor Advisory
    Added Reference Type Cisco Systems, Inc.: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-acl-bypass-RZU5NL3e 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-iosxr-acl-bypass-RZU5NL3e
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Received by [email protected]

    Mar. 13, 2024

    Action Type Old Value New Value
    Added Description A vulnerability in the access control list (ACL) processing on Pseudowire interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to improper assignment of lookup keys to internal interface contexts. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to access resources behind the affected device that were supposed to be protected by a configured ACL.
    Added Reference Cisco Systems, Inc. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-acl-bypass-RZU5NL3e [No types assigned]
    Added CWE Cisco Systems, Inc. CWE-284
    Added CVSS V3.1 Cisco Systems, Inc. AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
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.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-20322 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-20322 weaknesses.

CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software
CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: