CVE-2023-20200 Denial of service in Cisco Firepower Extensible Operating System (FXOS)
An authenticated remote attacker can cause a denial of service on Cisco Firepower and UCS devices by sending crafted SNMP requests, requiring valid credentials or community strings.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-20200?
CVE-2023-20200 is a high-severity denial of service vulnerability in Cisco Firepower Extensible Operating System (FXOS), published on 23 Aug 2023. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-20200?
It affects 8 products.
Products include Cisco Firepower 4112 Firmware, Cisco Firepower 4115, Cisco Firepower 4125 Firmware, Cisco Firepower 4143 Firmware, Cisco Firepower 9300 Firmware, Cisco Ucs 6324 Fabric Interconnect Firmware and 2 more.
How do I fix CVE-2023-20200?
No fix has been published for CVE-2023-20200 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2023-20200 being exploited?
There is no known exploitation of CVE-2023-20200 in the wild and no public exploit code.
Sources
Also known as GHSA-vrx2-vjh6-fhxx.