CVE-2026-20019
Multiple Cisco products are affected by a vulnerability in the Snort 3 NetFlow Detection Engine…
- Risk score
- 52/100
- CVSS
- 5.8 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 21 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 p…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.8 medium
- On your watchlist: cisco
References
Original description
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.
Last activity 21 Oct 2026. Patch Forecast updates every hour.