CVE-2024-20322Network attack vector

ACL bypass via misassigned interface lookup keys

Published Mar 13, 2024 · Updated Aug 2, 2024

ACL bypass in Cisco IOS XR Software 7.10.2 and 7.11.1 allows remote attackers to reach protected resources via transit traffic. Ingress ACL processing on PW-Ether interfaces assigns lookup keys to the wrong internal interface contexts, so matching traffic is not filtered as configured. Exposure requires an affected router with an IPv4 or IPv6 ingress ACL on at least one PW-Ether interface; the consequence is access to resources that the ACL was intended to protect.

CVSS severity5.8
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ACL bypass in Cisco IOS XR Software 7.10.2 and 7.11.1 allows remote attackers to reach protected resources via transit traffic. Ingress ACL processing on PW-Ether interfaces assigns lookup keys to the wrong internal interface contexts, so matching traffic is not filtered as configured. Exposure requires an affected router with an IPv4 or IPv6 ingress ACL on at least one PW-Ether interface; the consequence is access to resources that the ACL was intended to protect.

The record

CVE
CVE-2024-20322
Published
Mar 13, 2024
Updated
Aug 2, 2024
Vendor
ClamAV
Product
Cisco IOS XR Software
Classifications
CWE-284, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 13, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.10.2
  2. Affected versionversion=7.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Cisco IOS XR Softwareversion=7.10.2; version=7.11.1

Published CVSS scores

5.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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