Secure Firewall Management Center
CVE-2023-20155: A vulnerability in a logging API in Cisco Firepower Management Center (FMC) Software could allow an unauthe…
A vulnerability in a logging API in Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to cause the device to become unresponsive or trigger an unexpected reload.
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.2 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.4 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.6 | See the advisory |
| Cisco Firepower Management Center 6.7 | See the advisory |
| Cisco Firepower Management Center 6.7 | See the advisory |
| Cisco Firepower Management Center 6.7 | See the advisory |
| Cisco Firepower Management Center 6.7 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.0 | See the advisory |
| Cisco Firepower Management Center 7.1 | See the advisory |
| Cisco Firepower Management Center 7.1 | See the advisory |
| Cisco Firepower Management Center 7.1 | See the advisory |
| Cisco Firepower Management Center 7.1 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.2 | See the advisory |
| Cisco Firepower Management Center 7.3 | See the advisory |
| Cisco Firepower Management Center 7.3 | See the advisory |
| Cisco Firepower Management Center 7.3 | See the advisory |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
A vulnerability in a logging API in Cisco Firepower Management Center (FMC) Software could allow an unauthenticated, remote attacker to cause the device to become unresponsive or trigger an unexpected reload. This vulnerability could also allow an attacker with valid user credentials, but not Administrator privileges, to view a system log file that they would not normally have access to. This vulnerability is due to a lack of rate-limiting of requests that are sent to a specific API that is related to an FMC log. An attacker could exploit this vulnerability by sending a high rate of HTTP requests to the API. A successful exploit could allow the attacker to cause a denial of service (DoS) condition due to the FMC CPU spiking to 100 percent utilization or to the device reloading. CPU utilization would return to normal if the attack traffic was stopped before an unexpected reload was triggered.
Exploitation
The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 11 Oct 2026.