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CVE-2025-20316

Published: Sep 24, 2025Updated: Sep 26, 2025 Sources: CVE List NVD BDUCWE-284
NVD MITRE
5.3CVSSMEDIUM
EPSS Score
0.3%
Top 79.2%
CISA KEV
Not in KEV
Exploits
0 Known
Remediation
Patch Available

Description

A vulnerability in the access control list (ACL) programming of Cisco IOS XE Software for Cisco Catalyst 9500X and 9600X Series Switches could allow an unauthenticated, remote attacker to bypass a configured ACL on an affected device. This vulnerability is due to the flooding of traffic from an unlearned MAC address on a switch virtual interface (SVI) that has an egress ACL applied. An attacker could exploit this vulnerability by causing the VLAN to flush its MAC address table. This condition can also occur if the MAC address table is full. A successful exploit could allow the attacker to bypass an egress ACL on an affected device.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-284

Affected Products

Cisco IOS XE SoftwareCisco
On-premNetwork Device
Networking Infrastructure / router-switch
Cisco Catalyst 9500 Series SwitchesCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
Cisco Catalyst 9600 Series SwitchesCisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
ciscocommercialUSNetworking Infrastructureaka cisco systems, cisco systems inc.
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco

Exploitability

0 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cat9k-acl-L4K7VXgD
sec.cloudapps.cisco.com

Timeline

Published
Sep 24, 2025
Last Updated
Sep 26, 2025

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