CVE-2023-20246: Cisco IOS XE

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

Multiple Cisco products are affected by a vulnerability in Snort access control policies that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. This vulnerability is due to a logic error that occurs when the access control policies are being populated. An attacker could exploit this vulnerability by establishing a connection to an affected device. A successful exploit could allow the attacker to bypass configured access control rules on the affected system.

Affected products

• Cisco IOS XE: from 17.12, before 17.12.2 (fixed in 17.12.2)
• Cisco Secure Firewall Threat Defense: from 7.0.0, up to and including 7.3.1.1
• Snort Snort: from 3.0.0, before 3.1.57.0 (fixed in 3.1.57.0)

Published 2023-11-01. Last modified 2026-08-11.