CVE-2021-1256
MediumCVSS 6.0Exploitation Probability (EPSS)
Low risk40th percentile - higher than 40% of all known CVEs
Summary
A vulnerability in the CLI of Cisco FTD Software could allow an authenticated, local attacker to overwrite files on the file system using directory traversal techniques. This is due to insufficient validation of user input for the file path in a specific CLI command. A successful exploit could cause system instability if important system files are overwritten.
Risk Assessment
Overwriting important system files could lead to device failure or system integrity compromise, potentially disrupting network operations.
Recommendation
Apply Cisco updates for FTD. Restrict CLI access to trusted users and monitor CLI commands for suspicious activity.
Original NVD description (English source)
A vulnerability in the CLI of Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, local attacker to overwrite files on the file system of an affected device by using directory traversal techniques. A successful exploit could cause system instability if important system files are overwritten. This vulnerability is due to insufficient validation of user input for the file path in a specific CLI command. An attacker could exploit this vulnerability by logging in to a targeted device and issuing a specific CLI command with crafted user input. A successful exploit could allow the attacker to overwrite arbitrary files on the file system of the affected device. The attacker would need valid user credentials on the device.