CVE-2024-20465

mediumpriority · track · 23EPSS 0.004 · 35 %ileDEEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.42% (35th) EPSS

CVSS 5.8 · medium

Is it mine?

24 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cert_bund

EPSS · scored 2026-10-23

A vulnerability in the access control list (ACL) programming of Cisco IOS Software running on Cisco Industrial Ethernet 4000, 4010, and 5000 Series Switches could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to the incorrect handling of IPv4 ACLs on switched virtual interfaces when an administrator enables and disables Resilient Ethernet Protocol (REP). An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixed15.1(3)SVR1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.1(3)SVR2cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.1(3)SVR3cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.1(3)SVS1cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.1(3)SVT2cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.2(8)E2cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.2(8)E3cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.2(8)E4cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com
Fixed15.2(8)E5cisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

5.8

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.8mediumAV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · FSTEC (BDU) RU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · ENISA EU

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · psirt@cisco.com USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

v3.15.8mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:Nsecondary · Cisco PSIRT US

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-284USCWE-284US

affected products (24)

Products and version ranges known to be affected.

Cisco Industrial Ethernet Switches 4000all versionscert_bundDEcpe:/h:cisco:industrial_ethernet_switches:4000
Cisco Industrial Ethernet Switches 4010all versionscert_bundDEcpe:/h:cisco:industrial_ethernet_switches:4010
Cisco Industrial Ethernet Switches 5000all versionscert_bundDEcpe:/h:cisco:industrial_ethernet_switches:5000
Cisco 15.1(3)SVR1all versionscisco_csafUS
Cisco 15.1(3)SVR2all versionscisco_csafUS
Cisco 15.1(3)SVR3all versionscisco_csafUS
Cisco 15.1(3)SVS1all versionscisco_csafUS
Cisco 15.1(3)SVT2all versionscisco_csafUS
Cisco 15.2(8)E2all versionscisco_csafUS
Cisco 15.2(8)E3all versionscisco_csafUS
Cisco 15.2(8)E4all versionscisco_csafUS
Cisco 15.2(8)E5all versionscisco_csafUS
Cisco IOS≤ 15.2(8)E2enisa_euvdEU
Cisco IOS≤ 15.2(8)E3enisa_euvdEU
Cisco IOS≤ 15.2(8)E4enisa_euvdEU
Cisco IOS≤ 15.2(8)E5enisa_euvdEU
Cisco Systems Inc. Cisco IOS≤ 15.2(8)E5fstec_bduRU
Cisco Systems Inc. Cisco IOS≤ 15.2(8)E4fstec_bduRU
Cisco Systems Inc. Cisco IOS≤ 15.2(8)E3fstec_bduRU
Cisco Systems Inc. Cisco IOS≤ 15.2(8)E2fstec_bduRU

showing 20 of 24

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2024-2226Cisco IOS: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2024-09-25csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in Cisco IOS und Cisco Industrial Ethernet Switches ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
cisco-sa-repacl-9eXgnBpDCisco IOS Software on Cisco Industrial Ethernet Series Switches Access Control List Bypass Vulnerability2024-09-25csaf · cisco_csafUS
A vulnerability in the access control list (ACL) programming of Cisco IOS Software running on Cisco Industrial Ethernet 4000, 4010, and 5000 Series Switches could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to the incorrect handling of IPv4 ACLs on switched virtual interfaces when an administrator enables and disables Resilient Ethernet Protocol (REP). An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is part of the September 2024 release of the Cisco IOS and IOS XE Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2024 Semiannual Cisco IOS and IOS XE Software Security Advisory Bundled Publication ["https://sec.cloudapps.cisco.com/security/center/viewErp.x?alertId=ERP-75169"].

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cert_bund cisco_csaf NVD CVE.org MITRE

published 2024-09-25modified 2026-06-17

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan