CVE-2025-20316: Medium severity Cisco IOS XE Software vulnerability
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-20316?
CVE-2025-20316 has a high severity rating as it allows unauthenticated remote attackers to bypass access control lists on affected Cisco devices.
How do I fix CVE-2025-20316?
To fix CVE-2025-20316, ensure that you are using the latest version of Cisco IOS XE Software and apply any available patches from Cisco.
Which devices are affected by CVE-2025-20316?
CVE-2025-20316 affects Cisco Catalyst 9500X and 9600X Series Switches running specific versions of Cisco IOS XE Software.
What exploits are possible with CVE-2025-20316?
Exploiting CVE-2025-20316 could allow attackers to bypass configured ACLs, potentially leading to unauthorized access to sensitive data.
Is authentication required to exploit CVE-2025-20316?
No, CVE-2025-20316 can be exploited by unauthenticated remote attackers, making it particularly dangerous.