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CVE-2023-20161: Cisco Small Business Series Switches Buffer Overflow Vulnerabilities

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 11.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-18 · updated 2026-06-17
• Weakness: CWE-120

Description

Multiple vulnerabilities in the web-based user interface of certain Cisco Small Business Series Switches could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition or execute arbitrary code with root privileges on an affected device. These vulnerabilities are due to improper validation of requests that are sent to the web interface. For more information about these vulnerabilities, see the Details section of this advisory.

Affected products

• Cisco Business 250-16P-2G Firmware: all versions
• Cisco Business 250-16T-2G Firmware: all versions
• Cisco Business 250-24Fp-4G Firmware: all versions
• Cisco Business 250-24Fp-4X Firmware: all versions
• Cisco Business 250-24P-4G Firmware: all versions
• Cisco Business 250-24P-4X Firmware: all versions
• Cisco Business 250-24Pp-4G Firmware: all versions
• Cisco Business 250-24T-4G Firmware: all versions
• Cisco Business 250-24T-4X Firmware: all versions
• Cisco Business 250-48P-4G Firmware: all versions
• Cisco Business 250-48P-4X Firmware: all versions
• Cisco Business 250-48Pp-4G Firmware: all versions
• Cisco Business 250-48T-4G Firmware: all versions
• Cisco Business 250-48T-4X Firmware: all versions
• Cisco Business 250-8Fp-E-2G Firmware: all versions
• Cisco Business 250-8P-E-2G Firmware: all versions
• Cisco Business 250-8Pp-D Firmware: all versions
• Cisco Business 250-8Pp-E-2G Firmware: all versions
• Cisco Business 250-8T-D Firmware: all versions
• Cisco Business 250-8T-E-2G Firmware: all versions
• Cisco Business 350-12Np-4X Firmware: all versions
• Cisco Business 350-12Xs Firmware: all versions
• Cisco Business 350-12Xt Firmware: all versions
• Cisco Business 350-16Fp-2G Firmware: all versions
• Cisco Business 350-16P-2G Firmware: all versions
• Cisco Business 350-16P-E-2G Firmware: all versions
• Cisco Business 350-16T-2G Firmware: all versions
• Cisco Business 350-16T-E-2G Firmware: all versions
• Cisco Business 350-16Xts Firmware: all versions
• Cisco Business 350-24Fp-4G Firmware: all versions

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg-web-multi-S9g4Nkgv
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sg-web-multi-S9g4Nkgv

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