Denial of Service Vulnerability in Cisco Secure Firewall Threat Defense Software
CVE-2025-20217

8.6HIGH

Key Information:

Vendor

Cisco
Status
Cisco Firepower Threat Defense Software
Vendor
CVE Published:
14 August 2025

Badges

👾 Exploit Exists

What is CVE-2025-20217?

A flaw in the packet inspection feature of Cisco Secure Firewall Threat Defense Software allows remote, unauthenticated attackers to trigger a denial of service (DoS). This vulnerability arises from improper traffic processing, where specially crafted packets can exploit the system, leading it into an infinite loop while inspecting traffic. Consequently, this may hinder the performance of the device and lead to service interruptions as the system's watchdog attempts to restart the Snort process automatically. Timely patching is crucial to safeguard network integrity.

Affected Version(s)

Cisco Firepower Threat Defense Software 7.1.0

Cisco Firepower Threat Defense Software 7.1.0.1

Cisco Firepower Threat Defense Software 7.2.0

References

https://sec.cloudapps.cisco.com/security/center/content/C...

CVSS V3.1

Score:
8.6
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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CVE-2025-20217 : Denial of Service Vulnerability in Cisco Secure Firewall Threat Defense Software