CVE-2024-20263

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. Limited direct impact.

Exploit odds

0.4% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2024-01-26 18:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 07:06 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 0.4% in the next 30 days (EPSS).
• Severity: 5.8 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2024-01-26 18:15 UTC

Last modified

2026-06-17 07:06 UTC

Exploit probability

0.4% · EPSS, next 30 days

Weakness

CWE-284 · Improper access control

Record status

Modified

Affected

• Cisco cbs250-8t-d Firmware < 3.4.0.17
• Cisco cbs250-8pp-d Firmware < 3.4.0.17
• Cisco cbs250-8t-e-2g Firmware < 3.4.0.17
• Cisco cbs250-8pp-e-2g Firmware < 3.4.0.17
• Cisco cbs250-8p-e-2g Firmware < 3.4.0.17
• Cisco cbs250-8fp-e-2g Firmware < 3.4.0.17
• Cisco cbs250-16t-2g Firmware < 3.4.0.17
• Cisco cbs250-16p-2g Firmware < 3.4.0.17

Attack profile CVSS 3.1 · 5.8

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Changed

Confidentiality

None

Integrity

Low

Availability

None

Is it in your code?

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