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CVE-2023-20200

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-08-23 · updated 2026-06-17
• Weakness: CWE-835

Description

A vulnerability in the Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300 Security Appliances and of Cisco UCS 6300 Series Fabric Interconnects could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the improper handling of specific SNMP requests. An attacker could exploit this vulnerability by sending a crafted SNMP request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects all supported SNMP versions. To exploit this vulnerability through SNMPv2c or earlier, an attacker must know the SNMP community string that is configured on an affected device. To exploit this vulnerability through SNMPv3, the attacker must have valid credentials for an SNMP user who is configured on the affected device.

Affected products

• Cisco Firepower 4112 Firmware: all versions
• Cisco Firepower 4115: all versions
• Cisco Firepower 4125 Firmware: all versions
• Cisco Firepower 4143 Firmware: all versions
• Cisco Firepower 9300 Firmware: all versions
• Cisco Ucs 6324 Fabric Interconnect Firmware: from 4.1 before 4.1\(3l\); from 4.2 before 4.2\(3d\) — fixed in 4.1\(3l\), 4.2\(3d\)
• Cisco Ucs 6332-16Up Fabric Interconnect Firmware: from 4.1 before 4.1\(3l\); from 4.2 before 4.2\(3b\) — fixed in 4.1\(3l\), 4.2\(3b\)
• Cisco Ucs 6332 Fabric Interconnect Firmware: from 4.1 before 4.1\(3l\); from 4.2 through 4.2\(3b\) — fixed in 4.1\(3l\)

How to fix

Upgrade to a fixed version: Cisco Ucs 6324 Fabric Interconnect Firmware 4.1\(3l\), 4.2\(3d\); Cisco Ucs 6332-16Up Fabric Interconnect Firmware 4.1\(3l\), 4.2\(3b\); Cisco Ucs 6332 Fabric Interconnect Firmware 4.1\(3l\). Check the vendor advisory for mitigations.

References

• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fp-ucsfi-snmp-dos-qtv69NAO
• https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-fp-ucsfi-snmp-dos-qtv69NAO

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