{"cve":"CVE-2024-20263","nvd":{"published":"2024-01-26T18:15:11.163","modified":"2026-06-17T07:06:08.850","status":"Modified","description":"A vulnerability with the access control list (ACL) management within a stacked switch configuration of Cisco Business 250 Series Smart Switches and Business 350 Series Managed Switches could allow an unauthenticated, remote attacker to bypass protection offered by a configured ACL on an affected device. This vulnerability is due to incorrect processing of ACLs on a stacked configuration when either the primary or backup switches experience a full stack reload or power cycle. An attacker could exploit this vulnerability by sending crafted traffic through an affected device. A successful exploit could allow the attacker to bypass configured ACLs, causing traffic to be dropped or forwarded in an unexpected manner. The attacker does not have control over the conditions that result in the device being in the vulnerable state. Note: In the vulnerable state, the ACL would be correctly applied on the primary devices but could be incorrectly applied to the backup devices.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L","score":7.2},"cwes":["CWE-284"],"references":["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-bus-acl-bypass-5zn9hNJk","https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-bus-acl-bypass-5zn9hNJk"],"products":["cisco:cbs250-16p-2g_firmware","cisco:cbs250-16t-2g_firmware","cisco:cbs250-24fp-4g_firmware","cisco:cbs250-24fp-4x_firmware","cisco:cbs250-24p-4g_firmware","cisco:cbs250-24p-4x_firmware","cisco:cbs250-24pp-4g_firmware","cisco:cbs250-24t-4g_firmware","cisco:cbs250-24t-4x_firmware","cisco:cbs250-48p-4g_firmware","cisco:cbs250-48p-4x_firmware","cisco:cbs250-48pp-4g_firmware","cisco:cbs250-48t-4g_firmware","cisco:cbs250-48t-4x_firmware","cisco:cbs250-8fp-e-2g_firmware","cisco:cbs250-8p-e-2g_firmware","cisco:cbs250-8pp-d_firmware","cisco:cbs250-8pp-e-2g_firmware","cisco:cbs250-8t-d_firmware","cisco:cbs250-8t-e-2g_firmware","cisco:cbs350-12np-4x_firmware","cisco:cbs350-12xs_firmware","cisco:cbs350-12xt_firmware","cisco:cbs350-16fp-2g_firmware","cisco:cbs350-16p-2g_firmware","cisco:cbs350-16p-e-2g_firmware","cisco:cbs350-16t-2g_firmware","cisco:cbs350-16t-e-2g_firmware","cisco:cbs350-16xts_firmware","cisco:cbs350-24fp-4g_firmware","cisco:cbs350-24fp-4x_firmware","cisco:cbs350-24mgp-4x_firmware","cisco:cbs350-24ngp-4x_firmware","cisco:cbs350-24p-4g_firmware","cisco:cbs350-24p-4x_firmware","cisco:cbs350-24s-4g_firmware","cisco:cbs350-24t-4g_firmware","cisco:cbs350-24t-4x_firmware","cisco:cbs350-24xs_firmware","cisco:cbs350-24xt_firmware","cisco:cbs350-24xts_firmware","cisco:cbs350-48fp-4g_firmware","cisco:cbs350-48fp-4x_firmware","cisco:cbs350-48ngp-4x_firmware","cisco:cbs350-48p-4g_firmware","cisco:cbs350-48p-4x_firmware","cisco:cbs350-48t-4g_firmware","cisco:cbs350-48t-4x_firmware","cisco:cbs350-48xt-4x_firmware","cisco:cbs350-8fp-2g_firmware"],"source":"nvd","synced_at":"2026-10-19T21:44:57.175229480+00:00"},"epss":{"cve":"CVE-2024-20263","score":0.0045,"percentile":0.39156,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}