Detections
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Multiple Cisco Products Snort 3 DoS Vulnerabilities (cisco-sa-snort3-misc-dos-6mB22qAK_CVE-2026-20019_CVE-2026-20179_CVE-2026-20197)
medium Nessus Plugin ID 369979
Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco ASA Software is affected by multiple vulnerabilities.- 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. (CVE-2026-20019)
- Multiple Cisco products are affected by a vulnerability in the Snort 3 Generic Routing Encapsulation (GRE) 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 GRE packets. An attacker could exploit this vulnerability by sending a crafted GRE 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.
(CVE-2026-20179)
- 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. (CVE-2026-20197)
Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug IDs CSCwr25134, CSCwu23999, CSCwu51449, CSCwu51451, CSCwu53570See Also
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwr25134
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu23999
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu51449
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCwu51451
Plugin Details
Severity: Medium
ID: 369979
File Name: cisco-sa-snort3-misc-dos-6mB22qAK_CVE-2026-20019_CVE-2026-20179_CVE-2026-20197-asa.nasl
Version: 1.2
Type: Local
Family: CISCO
Published: 10/21/2026
Updated: 10/22/2026
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 1.2
Percentile: 0.01
CVSS v2
Risk Factor: Medium
Base Score: 5
Temporal Score: 3.7
Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2026-20197
CVSS v3
Risk Factor: Medium
Base Score: 5.8
Temporal Score: 5.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C
Vulnerability Information
CPE: cpe:/a:cisco:adaptive_security_appliance_software
Required KB Items: Host/Cisco/ASA/model
Exploit Ease: No known exploits are available
Patch Publication Date: 10/21/2026
Vulnerability Publication Date: 10/21/2026
Reference Information
CVE: CVE-2026-20019, CVE-2026-20179, CVE-2026-20197
CISCO-SA: cisco-sa-snort3-misc-dos-6mB22qAK_CVE-2026-20019_CVE-2026-20179_CVE-2026-20197
CISCO-BUG-ID: CSCwr25134, CSCwu23999, CSCwu51449, CSCwu51451, CSCwu53570