---
id: CVE-2019-1693
title: >-
  A vulnerability in the WebVPN service of Cisco Adaptive Security Appliance
  (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow
  an authenticated, remote attacker to cause a denial of service (DoS) condition
  on an …
summary: >-
  A vulnerability in the WebVPN service of Cisco Adaptive Security Appliance
  (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow
  an authenticated, remote attacker to cause a denial of service (DoS) condition
  on an …
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-399
vendor: cisco
product: adaptive_security_appliance_software
affected:
  - adaptive_security_appliance_software < 9.4.4.34
  - 'adaptive_security_appliance_software >= 9.5, < 9.6.4.25'
  - 'adaptive_security_appliance_software >= 9.7, < 9.8.4'
  - 'adaptive_security_appliance_software >= 9.9, < 9.9.2.50'
  - 'adaptive_security_appliance_software >= 9.10, < 9.10.1.17'
  - '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_software 9.10.1.17
  - 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-2019-1693'
references:
  - url: 'http://www.securityfocus.com/bid/108157'
    label: psirt@cisco.com
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftd-dos
    label: psirt@cisco.com
  - url: 'http://www.securityfocus.com/bid/108157'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftd-dos
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.02028
epssPercentile: 0.80172
ingestedAt: '2026-08-11T19:48:26.178Z'
---

## Overview

A vulnerability in the WebVPN service of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper management of authenticated sessions in the WebVPN portal. An attacker could exploit this vulnerability by authenticating with valid credentials and accessing a specific URL in the WebVPN portal. A successful exploit could allow the attacker to cause the device to reload, resulting in a temporary DoS condition.

## Affected

- `adaptive_security_appliance_software < 9.4.4.34`
- `adaptive_security_appliance_software >= 9.5, < 9.6.4.25`
- `adaptive_security_appliance_software >= 9.7, < 9.8.4`
- `adaptive_security_appliance_software >= 9.9, < 9.9.2.50`
- `adaptive_security_appliance_software >= 9.10, < 9.10.1.17`
- `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_software 9.10.1.17`
- `secure_firewall_threat_defense 6.3.0.3`