CVE-2023-20246

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-01 · updated 2026-08-11
Weakness: CWE-290

Description

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 Firepower Threat Defense Software: from 7.0.0 through 7.3.1.1
Snort: from 3.0.0 before 3.1.57.0 — fixed in 3.1.57.0

How to fix

Upgrade to a fixed version: Cisco IOS XE 17.12.2; Snort 3.1.57.0. Check the vendor advisory for mitigations.

References

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