CVE-2026-20019
published 2026-10-21CVE-2026-20019: Multiple Cisco products are affected by a vulnerability in the Snort 3 NetFlow Detection Engine that could allow an unauthenticated, remote attacker to cause…
PriorityP335medium5.8CVSS 3.1
AVNACLPRNUINSCCNINAL
EPSS
0.42%
34.8th percentile
Multiple Cisco products are affected by a vulnerability in the Snort 3 NetFlow 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 UDP Netflow Protocol packets. An attacker could exploit this vulnerability by sending a single crafted Netflow packet through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause the Snort 3 Detection Engine to restart unexpectedly, resulting in a DoS condition.
Affected
203 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
| cisco | cisco_open_source_snort3 | — | — |
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No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-10-21
Published