Cisco · Cisco Asa · CVE-2019-1715
**Name of the Vulnerable Software and Affected Versions**
Cisco Adaptive Security Appliance (ASA) Software (affected versions not specified)
Cisco Firepower Threat Defense (FTD) Software (affected versions not specified)
**Description**
A vulnerability in the Deterministic Random Bit Generator (DRBG) used in Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a cryptographic collision, enabling the attacker to discover the private key of an affected device. The vulnerability is due to insufficient entropy in the DRBG when generating cryptographic keys. An attacker could exploit this vulnerability by generating a large number of cryptographic keys on an affected device and looking for collisions with target devices. A successful exploit could allow the attacker to impersonate an affected target device or to decrypt traffic secured by an affected key that is sent to or from an affected target device.
**Recommendations**
For Cisco Adaptive Security Appliance (ASA) Software, update to a version that includes the software update released by Cisco to address this vulnerability.
For Cisco Firepower Threat Defense (FTD) Software, update to a version that includes the software update released by Cisco to address this vulnerability.
As a temporary workaround, consider restricting access to the DRBG component until a patch is available.