CVE-2025-20217
published 2025-08-14CVE-2025-20217: A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an…
PriorityP351high8.6CVSS 3.1
AVNACLPRNUINSCCNINAH
EPSS
0.68%
48.8th percentile
A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to incorrect processing of traffic that is inspected by an affected device. An attacker could exploit this vulnerability by sending crafted traffic through the affected device. A successful exploit could allow the attacker to cause the affected device to enter an infinite loop while inspecting traffic, resulting in a DoS condition. The system watchdog will restart the Snort process automatically.
Affected
30 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
| cisco | cisco_firepower_threat_defense_software | — | — |
CVSS provenance
nvdv3.18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
vendor_cisco8.6HIGH
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GHSA
GHSA-w2gg-j3hp-gfqv: A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could al
ghsa_unreviewed·2025-08-14
CVE-2025-20217 [HIGH] CWE-835 GHSA-w2gg-j3hp-gfqv: A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could al
A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to incorrect processing of traffic that is inspected by an affected device. An attacker could exploit this vulnerability by sending crafted traffic through the affected device. A successful exploit could allow the attacker to cause the affected device to enter an infinite loop while inspecting traffic, resulting in a DoS condition. The system watchdog will restart the Snort process automatically.
Cisco
Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
vendor_cisco·2025-08-14·CVSS 8.6
CVE-2025-20217 [HIGH] CWE-835 Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
This vulnerability is due to incorrect processing of traffic that is inspected by an affected device. An attacker could exploit this vulnerability by sending crafted traffic through the affected device. A successful exploit could allow the attacker to cause the affected device to enter an infinite loop while inspecting traffic, resulting in a DoS condition. The system watchdog will restart the Snort process automatically.
Cisco has released software
Cisco
Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
vendor_cisco·CVSS 3.1
CVE-2025-20217 Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
CVE-2025-20217: Cisco Secure Firewall Threat Defense Software Snort 3 Denial of Service Vulnerability
A vulnerability in the packet inspection functionality of the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of traffic that is inspected by an affected device. An attacker could exploit this vulnerability by sending crafted traffic through the affected device. A successful exploit could allow the attacker to cause the affected device to enter an infinite loop while inspecting traffic, resulting in a DoS condition. The system watchdog will restart the Snort process automatically. Cisco has rele
No detection rules found.
No public exploits indexed.
2025-08-14
Published