CVE-2023-20200: A vulnerability in the Simple Network Management Protocol (SNMP) service of Cisco FXOS Software for Firepower 4100 Series and Firepower 9300 Security ...

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.

Metrics

CVSS 3.1

6.3/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS Probability

0.51%

39.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Firepower 9300 Firmware	All versions
Cisco	Firepower 4143 Firmware	All versions
Cisco	Firepower 4112 Firmware	All versions
Cisco	Ucs 6324 Fabric Interconnect Firmware	>= 4.1, < 4.1\(3l\)
Cisco	Ucs 6324 Fabric Interconnect Firmware	>= 4.2, < 4.2\(3d\)
Cisco	Firepower 4125 Firmware	All versions
Cisco	Firepower 4115	All versions
Cisco	Ucs 6332 Fabric Interconnect Firmware	>= 4.1, < 4.1\(3l\)
Cisco	Ucs 6332 Fabric Interconnect Firmware	>= 4.2, <= 4.2\(3b\)
Cisco	Ucs 6332-16up Fabric Interconnect Firmware	>= 4.1, < 4.1\(3l\)
Cisco	Ucs 6332-16up Fabric Interconnect Firmware	>= 4.2, < 4.2\(3b\)

References

Timeline

Published: Aug 23, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-20200?

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.

How severe is CVE-2023-20200?

CVE-2023-20200 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.

How do I fix CVE-2023-20200?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.