CVE-2026-20065 (GCVE-0-2026-20065)

Vulnerability from cvelistv5 – Published: 2026-03-04 17:48 – Updated: 2026-03-04 20:50
VLAI
Title
Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability
Summary
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 an error in the binder module initialization logic of the Snort Detection Engine. An attacker could exploit this vulnerability by sending certain packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-04 20:49 UTC
CWE
Impacted products
Vendor Product Version CPE status
Cisco Cisco Secure Firewall Threat Defense (FTD) Software Affected: 7.0.0
Affected: 7.0.0.1
Affected: 7.0.1
Affected: 7.1.0
Affected: 7.0.1.1
Affected: 7.1.0.1
Affected: 7.0.2
Affected: 7.2.0
Affected: 7.0.2.1
Affected: 7.0.3
Affected: 7.1.0.2
Affected: 7.2.0.1
Affected: 7.0.4
Affected: 7.2.1
Affected: 7.0.5
Affected: 7.3.0
Affected: 7.2.2
Affected: 7.2.3
Affected: 7.3.1
Affected: 7.1.0.3
Affected: 7.2.4
Affected: 7.0.6
Affected: 7.2.5
Affected: 7.2.4.1
Affected: 7.3.1.1
Affected: 7.4.0
Affected: 7.0.6.1
Affected: 7.2.5.1
Affected: 7.4.1
Affected: 7.2.6
Affected: 7.0.6.2
Affected: 7.4.1.1
Affected: 7.2.7
Affected: 7.2.5.2
Affected: 7.3.1.2
Affected: 7.2.8
Affected: 7.6.0
Affected: 7.4.2
Affected: 7.2.8.1
Affected: 7.0.6.3
Affected: 7.4.2.1
Affected: 7.2.9
Affected: 7.0.7
Affected: 7.4.2.2
Affected: 7.2.10
Affected: 7.4.2.3
Affected: 7.0.8
Affected: 7.0.8.1
Affected: 7.4.2.4
Affected: 7.2.10.2
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Cisco Cisco UTD SNORT IPS Engine Software Affected: 17.3.1a
Affected: 17.2.1r
Affected: 17.3.2
Affected: 17.4.1a
Affected: 17.5.1
Affected: 17.3.3
Affected: 17.5.1a
Affected: 17.3.4
Affected: 17.3.4a
Affected: 17.4.2
Affected: 17.4.1b
Affected: 17.6.1a
Affected: 17.7.1a
Affected: 17.6.2
Affected: 17.8.1a
Affected: 17.3.5
Affected: 17.6.3
Affected: 17.6.3a
Affected: 17.7.2
Affected: 17.9.1a
Affected: 17.6.4
Affected: 17.10.1a
Affected: 17.3.6
Affected: 17.3.7
Affected: 17.9.2a
Affected: 17.6.5
Affected: 17.11.1a
Affected: 17.9.3a
Affected: 17.12.1a
Affected: 17.9.4
Affected: 17.6.6
Affected: 17.3.8
Affected: 17.3.8a
Affected: 17.6.6a
Affected: 17.9.4a
Affected: 17.12.2
Affected: 17.13.1a
Affected: 17.9.5a
Affected: 17.12.3
Affected: 17.6.7
Affected: 17.14.1a
Affected: 17.12.4
Affected: 17.12.3a
Affected: 17.15.1a
Affected: 17.6.8
Affected: 17.9.6
Affected: 17.6.8a
Affected: 17.16.1a
Affected: 17.9.5e
Affected: 17.12.4a
Affected: 17.15.2c
Affected: 17.9.5f
Affected: 17.12.4b
Affected: 17.15.2a
Affected: 17.12.5
Affected: 17.17.1
Affected: 17.12.5a
Affected: 17.9.7a
Affected: 17.15.3a
Affected: 17.15.3
Affected: 17.12.5b
Affected: 17.12.5c
Affected: 17.15.4
Affected: 17.9.7b
Affected: 17.18.1
Affected: 17.18.1a
Affected: 17.12.6
Affected: 17.9.8
Affected: 17.15.4c
Affected: 17.12.5d
Affected: 17.18.2
guessed Create a notification for this product.
Show details on NVD website

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            {
              "status": "affected",
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            {
              "status": "affected",
              "version": "7.2.8"
            },
            {
              "status": "affected",
              "version": "7.6.0"
            },
            {
              "status": "affected",
              "version": "7.4.2"
            },
            {
              "status": "affected",
              "version": "7.2.8.1"
            },
            {
              "status": "affected",
              "version": "7.0.6.3"
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            {
              "status": "affected",
              "version": "7.4.2.1"
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            {
              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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            {
              "status": "affected",
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            {
              "status": "affected",
              "version": "17.3.4"
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              "status": "affected",
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              "version": "17.15.4"
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              "version": "17.9.7b"
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              "status": "affected",
              "version": "17.18.1"
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              "status": "affected",
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          "lang": "en",
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        }
      ],
      "exploits": [
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          "lang": "en",
          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
        }
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            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
            "version": "3.1"
          },
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      "problemTypes": [
        {
          "descriptions": [
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              "cweId": "CWE-667",
              "description": "Improper Locking",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-snort3-multi-dos-XFWkWSwz",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz"
        }
      ],
      "source": {
        "advisory": "cisco-sa-snort3-multi-dos-XFWkWSwz",
        "defects": [
          "CSCwn49805"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability"
    }
  },
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    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20065",
    "datePublished": "2026-03-04T17:48:49.615Z",
    "dateReserved": "2025-10-08T11:59:15.357Z",
    "dateUpdated": "2026-03-04T20:50:05.611Z",
    "state": "PUBLISHED"
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A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.\"},{\"lang\":\"es\",\"value\":\"M\u00faltiples productos Cisco se ven afectados por una vulnerabilidad en el motor de detecci\u00f3n Snort 3 que podr\u00eda permitir a un atacante remoto no autenticado provocar que el motor de detecci\u00f3n Snort 3 se reinicie, lo que resultar\u00eda en una interrupci\u00f3n de la inspecci\u00f3n de paquetes.\\n\\nEsta vulnerabilidad se debe a un error en la l\u00f3gica de inicializaci\u00f3n del m\u00f3dulo \u0027binder\u0027 del motor de detecci\u00f3n Snort. Un atacante podr\u00eda explotar esta vulnerabilidad al enviar ciertos paquetes a trav\u00e9s de una conexi\u00f3n establecida que es analizada por Snort 3. 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Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-03-27T08:09:48+00:00",
      "cve": "CVE-2026-20065",
      "id": "CVE-2026-20065",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20065.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20065\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-04T20:49:52.369498Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-04T20:49:58.639Z\"}}], \"cna\": {\"title\": \"Multiple Cisco Products Snort 3 TBD Denial of Service Vulnerability\", \"source\": {\"defects\": [\"CSCwn49805\"], \"advisory\": \"cisco-sa-snort3-multi-dos-XFWkWSwz\", \"discovery\": \"EXTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 5.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": 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\"7.2.0.1\"}, {\"status\": \"affected\", \"version\": \"7.0.4\"}, {\"status\": \"affected\", \"version\": \"7.2.1\"}, {\"status\": \"affected\", \"version\": \"7.0.5\"}, {\"status\": \"affected\", \"version\": \"7.3.0\"}, {\"status\": \"affected\", \"version\": \"7.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.3\"}, {\"status\": \"affected\", \"version\": \"7.3.1\"}, {\"status\": \"affected\", \"version\": \"7.1.0.3\"}, {\"status\": \"affected\", \"version\": \"7.2.4\"}, {\"status\": \"affected\", \"version\": \"7.0.6\"}, {\"status\": \"affected\", \"version\": \"7.2.5\"}, {\"status\": \"affected\", \"version\": \"7.2.4.1\"}, {\"status\": \"affected\", \"version\": \"7.3.1.1\"}, {\"status\": \"affected\", \"version\": \"7.4.0\"}, {\"status\": \"affected\", \"version\": \"7.0.6.1\"}, {\"status\": \"affected\", \"version\": \"7.2.5.1\"}, {\"status\": \"affected\", \"version\": \"7.4.1\"}, {\"status\": \"affected\", \"version\": \"7.2.6\"}, {\"status\": \"affected\", \"version\": \"7.0.6.2\"}, {\"status\": \"affected\", \"version\": \"7.4.1.1\"}, {\"status\": \"affected\", \"version\": \"7.2.7\"}, {\"status\": \"affected\", \"version\": \"7.2.5.2\"}, {\"status\": \"affected\", \"version\": \"7.3.1.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8\"}, {\"status\": \"affected\", \"version\": \"7.6.0\"}, {\"status\": \"affected\", \"version\": \"7.4.2\"}, {\"status\": \"affected\", \"version\": \"7.2.8.1\"}, {\"status\": \"affected\", \"version\": \"7.0.6.3\"}, {\"status\": \"affected\", \"version\": \"7.4.2.1\"}, {\"status\": \"affected\", \"version\": \"7.2.9\"}, {\"status\": \"affected\", \"version\": \"7.0.7\"}, {\"status\": \"affected\", \"version\": \"7.4.2.2\"}, {\"status\": \"affected\", \"version\": \"7.2.10\"}, {\"status\": \"affected\", \"version\": \"7.4.2.3\"}, {\"status\": \"affected\", \"version\": \"7.0.8\"}, {\"status\": \"affected\", \"version\": \"7.0.8.1\"}, {\"status\": \"affected\", \"version\": \"7.4.2.4\"}, {\"status\": \"affected\", \"version\": \"7.2.10.2\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco UTD SNORT IPS Engine Software\", \"versions\": [{\"status\": \"affected\", \"version\": \"17.3.1a\"}, {\"status\": \"affected\", \"version\": \"17.2.1r\"}, {\"status\": \"affected\", \"version\": \"17.3.2\"}, {\"status\": \"affected\", \"version\": \"17.4.1a\"}, {\"status\": \"affected\", \"version\": \"17.5.1\"}, {\"status\": \"affected\", \"version\": \"17.3.3\"}, {\"status\": \"affected\", \"version\": \"17.5.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.4\"}, {\"status\": \"affected\", \"version\": \"17.3.4a\"}, {\"status\": \"affected\", \"version\": \"17.4.2\"}, {\"status\": \"affected\", \"version\": \"17.4.1b\"}, {\"status\": \"affected\", \"version\": \"17.6.1a\"}, {\"status\": \"affected\", \"version\": \"17.7.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.2\"}, {\"status\": \"affected\", \"version\": \"17.8.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.5\"}, {\"status\": \"affected\", \"version\": \"17.6.3\"}, {\"status\": \"affected\", \"version\": \"17.6.3a\"}, {\"status\": \"affected\", \"version\": \"17.7.2\"}, {\"status\": \"affected\", \"version\": \"17.9.1a\"}, {\"status\": \"affected\", \"version\": \"17.6.4\"}, {\"status\": \"affected\", \"version\": \"17.10.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.6\"}, {\"status\": \"affected\", \"version\": \"17.3.7\"}, {\"status\": \"affected\", \"version\": \"17.9.2a\"}, {\"status\": \"affected\", \"version\": \"17.6.5\"}, {\"status\": \"affected\", \"version\": \"17.11.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.3a\"}, {\"status\": \"affected\", \"version\": \"17.12.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.4\"}, {\"status\": \"affected\", \"version\": \"17.6.6\"}, {\"status\": \"affected\", \"version\": \"17.3.8\"}, {\"status\": \"affected\", \"version\": \"17.3.8a\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.9.4a\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.13.1a\"}, {\"status\": \"affected\", \"version\": \"17.9.5a\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"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\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwz\", \"name\": \"cisco-sa-snort3-multi-dos-XFWkWSwz\"}], \"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 an error in the binder module initialization logic of the Snort Detection Engine. An attacker could exploit this vulnerability by sending certain packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-667\", \"description\": \"Improper Locking\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-04T17:48:49.615Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20065\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-04T20:50:05.611Z\", \"dateReserved\": \"2025-10-08T11:59:15.357Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-04T17:48:49.615Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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