Vulnerability in Cisco iOS Xe Software
CVE-2025-20316
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.
EPSS: 0.003 (21.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Cisco Ios Xe Software — versions 17.7.1, 17.10.1, 17.10.1b
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2025-20316?
- CVE-2025-20316 is a medium-severity vulnerability in Cisco iOS Xe Software, classified under Improper Access Control. CVSS score: 5.3/10. Published 2025-09-24.
- How severe is CVE-2025-20316?
- Medium severity. CVSS v3 base score is 5.3 out of 10.