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CVE-2024-20263

HIGH
7.2
CVSS Score
Published: January 26, 2024 at 05:27 PM UTC
Updated: June 17, 2026 at 07:06 AM UTC
171 products affected across 1 vendorSG550X 24MPP FirmwareSG550X 24P FirmwareSG550X 48MP Firmware

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Severity
HIGH7.2
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Cbs250-16p 2G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-16p-2g (same device)
Cbs250-16t 2G Firmware· Cisco
95%
2.5 ≤ v ≤ 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-16t-2g (same device)
Cbs250-24fp 4G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24fp-4g (same device)
Cbs250-24fp 4X Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24fp-4x (same device)
Cbs250-24p 4G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24p-4g (same device)
Cbs250-24p 4X Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24p-4x (same device)
Cbs250-24pp 4G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24pp-4g (same device)
Cbs250-24t 4G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24t-4g (same device)
Cbs250-24t 4X Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-24t-4x (same device)
Cbs250-48p 4G Firmware· Cisco
95%
2.5 ≤ v < 2.5.9.543.4 ≤ v < 3.4.0.17
Affected range stops below 2.5.9.54, so it looks safe — our inference, not a vendor statement
Affected range stops below 3.4.0.17, so it looks safe — our inference, not a vendor statement
cisco-cbs250-48p-4g (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: [email protected]
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-bus-acl-bypass-5zn9hNJk

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.2HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
NONE
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-284NVD-CWE-noinfo

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