---
id: CVE-2019-1715
title: >-
  A vulnerability in the Deterministic Random Bit Generator (DRBG), also known
  as Pseudorandom Number Generator (PRNG), used in Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow …
summary: >-
  A vulnerability in the Deterministic Random Bit Generator (DRBG), also known
  as Pseudorandom Number Generator (PRNG), used in Cisco Adaptive Security
  Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software
  could allow …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-332
  - CWE-332
vendor: cisco
product: adaptive_security_appliance_device_manager
affected:
  - 'adaptive_security_appliance_device_manager >= 9.8, < 9.8.4'
  - 'adaptive_security_appliance_device_manager >= 9.9, < 9.9.2.50'
  - 'secure_firewall_threat_defense >= 6.2.1, < 6.2.3.12'
  - 'secure_firewall_threat_defense >= 6.3.0, < 6.3.0.3'
patched:
  - adaptive_security_appliance_device_manager 9.9.2.50
  - secure_firewall_threat_defense 6.3.0.3
published: '2019-05-03'
updated: '2026-08-11'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2019-1715'
references:
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftd-entropy
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftd-entropy
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.01712
epssPercentile: 0.7639
ingestedAt: '2026-08-11T19:48:26.713Z'
---

## Overview

A vulnerability in the Deterministic Random Bit Generator (DRBG), also known as Pseudorandom Number Generator (PRNG), 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.

## Affected

- `adaptive_security_appliance_device_manager >= 9.8, < 9.8.4`
- `adaptive_security_appliance_device_manager >= 9.9, < 9.9.2.50`
- `secure_firewall_threat_defense >= 6.2.1, < 6.2.3.12`
- `secure_firewall_threat_defense >= 6.3.0, < 6.3.0.3`

## Remediation

Upgrade past the affected range:

- `adaptive_security_appliance_device_manager 9.9.2.50`
- `secure_firewall_threat_defense 6.3.0.3`