Description
Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection.
This vulnerability is due to incomplete error checking when Snort 3 parses Teredo packets. An attacker could exploit this vulnerability by sending a crafted Teredo packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
This vulnerability is due to incomplete error checking when Snort 3 parses Teredo packets. An attacker could exploit this vulnerability by sending a crafted Teredo packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
Analysis
Analysis and contextual insights are available on OpenCVE Cloud.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| Cisco | Cisco Open Source Snort3 | unknown |
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| Cisco | Cisco Secure Firewall Threat Defense (FTD) Software | unknown |
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| Cisco | Cisco UTD SNORT IPS Engine Software | unknown |
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| Vendor | Product | Confidence | Versions | ||||||||
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| Cisco | Cisco Open Source Snort3 | 100% |
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| Cisco | Cisco Secure Firewall Threat Defense (ftd) Software | 100% |
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| Cisco | Cisco Utd Snort Ips Engine Software | 100% |
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| Cisco | Secure Firewall Threat Defense | 100% |
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Remediation
No vendor fix or workaround currently provided.
Additional remediation guidance may be available on OpenCVE Cloud.
Tracking
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Advisories
No advisories yet.
References
History
Thu, 22 Oct 2026 09:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Cisco
Cisco cisco Open Source Snort3 Cisco cisco Secure Firewall Threat Defense (ftd) Software Cisco cisco Utd Snort Ips Engine Software Cisco secure Firewall Threat Defense |
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| Vendors & Products |
Cisco
Cisco cisco Open Source Snort3 Cisco cisco Secure Firewall Threat Defense (ftd) Software Cisco cisco Utd Snort Ips Engine Software Cisco secure Firewall Threat Defense |
Wed, 21 Oct 2026 17:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Multiple Cisco products are affected by a vulnerability in the Snort 3 Teredo Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to incomplete error checking when Snort 3 parses Teredo packets. An attacker could exploit this vulnerability by sending a crafted Teredo packet to a targeted device to be parsed by Snort. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition. | |
| Title | Multiple Cisco Products Snort 3 Teredo Protocol Denial of Service Vulnerability | |
| Weaknesses | CWE-119 | |
| References |
| |
| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: cisco
Published:
Updated: 2026-10-22T13:37:55.683Z
Reserved: 2025-10-08T11:59:15.396Z
Link: CVE-2026-20197
Vulnrichment
No data.
NVD
Status : Awaiting Analysis
Published: 2026-10-21T17:18:27.543
Modified: 2026-10-21T18:54:37.403
Link: CVE-2026-20197
Redhat
No data.
OpenCVE Enrichment
Updated: 2026-10-22T09:07:35Z
Weaknesses