CVE-2026-20067

Multiple Cisco products are affected by a vulnerability in the Snort 3 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 parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts.

CVSS v3 5.8 MEDIUM

5.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact LOW

Scope CHANGED

References

Link	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz

Configurations

No configuration.

History

17 Jun 2026, 10:17

Type	Values Removed	Values Added
Summary		(es) Múltiples productos Cisco se ven afectados por una vulnerabilidad en el motor de detección de Snort 3 que podría permitir a un atacante remoto no autenticado provocar el reinicio del motor de detección de Snort 3, lo que resultaría en una interrupción de la inspección de paquetes. Esta vulnerabilidad se debe a una comprobación de errores incompleta al analizar los campos de Multicast DNS del encabezado HTTP. Un atacante podría explotar esta vulnerabilidad enviando paquetes HTTP manipulados a través de una conexión establecida para ser analizados por Snort 3. Un exploit exitoso podría permitir al atacante causar una condición de DoS cuando el motor de detección de Snort 3 se reinicia inesperadamente.

04 Mar 2026, 18:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-03-04 18:16

Updated : 2026-06-17 10:17

NVD link : CVE-2026-20067

Mitre link : CVE-2026-20067

CVE.ORG link : CVE-2026-20067

JSON object : View

Products Affected

No product.

CWE

CWE-787

Out-of-bounds Write

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"affected", "version": "17.14.1a"}, {"status": "affected", "version": "17.12.4"}, {"status": "affected", "version": "17.12.3a"}, {"status": "affected", "version": "17.15.1a"}, {"status": "affected", "version": "17.6.8"}, {"status": "affected", "version": "17.9.6"}, {"status": "affected", "version": "17.6.8a"}, {"status": "affected", "version": "17.16.1a"}, {"status": "affected", "version": "17.9.5e"}, {"status": "affected", "version": "17.12.4a"}, {"status": "affected", "version": "17.15.2c"}, {"status": "affected", "version": "17.9.5f"}, {"status": "affected", "version": "17.12.4b"}, {"status": "affected", "version": "17.15.2a"}, {"status": "affected", "version": "17.12.5"}, {"status": "affected", "version": "17.17.1"}, {"status": "affected", "version": "17.12.5a"}, {"status": "affected", "version": "17.9.7a"}, {"status": "affected", "version": "17.15.3a"}, {"status": "affected", "version": "17.15.3"}, {"status": "affected", "version": "17.12.5b"}, {"status": "affected", "version": "17.12.5c"}, {"status": "affected", "version": "17.15.4"}, {"status": "affected", "version": "17.9.7b"}, {"status": "affected", "version": "17.18.1"}, {"status": "affected", "version": "17.18.1a"}, {"status": "affected", "version": "17.12.6"}, {"status": "affected", "version": "17.9.8"}, {"status": "affected", "version": "17.15.4c"}, {"status": "affected", "version": "17.12.5d"}, {"status": "affected", "version": "17.18.2"}], "defaultStatus": "unknown"}]}], "published": "2026-03-04T18:16:21.950", "references": [{"url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz", "source": "psirt@cisco.com"}], "vulnStatus": "Awaiting Analysis", "weaknesses": [{"type": "Secondary", "source": "psirt@cisco.com", "description": [{"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "Multiple Cisco products are affected by a vulnerability in the Snort 3 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. \r\n\r\nThis vulnerability is due to incomplete error checking when parsing the Multicast DNS fields of the HTTP header. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection to be parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine unexpectedly restarts."}, {"lang": "es", "value": "M\u00faltiples productos Cisco se ven afectados por una vulnerabilidad en el motor de detecci\u00f3n de Snort 3 que podr\u00eda permitir a un atacante remoto no autenticado provocar el reinicio del motor de detecci\u00f3n de Snort 3, lo que resultar\u00eda en una interrupci\u00f3n de la inspecci\u00f3n de paquetes.\n\nEsta vulnerabilidad se debe a una comprobaci\u00f3n de errores incompleta al analizar los campos de Multicast DNS del encabezado HTTP. Un atacante podr\u00eda explotar esta vulnerabilidad enviando paquetes HTTP manipulados a trav\u00e9s de una conexi\u00f3n establecida para ser analizados por Snort 3. Un exploit exitoso podr\u00eda permitir al atacante causar una condici\u00f3n de DoS cuando el motor de detecci\u00f3n de Snort 3 se reinicia inesperadamente."}], "lastModified": "2026-06-17T10:17:00.967", "sourceIdentifier": "psirt@cisco.com"}