CVE-2026-20026 (GCVE-0-2026-20026)

Vulnerability from cvelistv5 – Published: 2026-01-07 16:23 – Updated: 2026-02-12 18:48
VLAI?
Title
Multiple Cisco Products Snort 3 DCERPC Vulnerabilities
Summary
Multiple Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).
Severity ?
5.8 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
CWE
Assigner
References
Impacted products
Vendor Product Version
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: 7.7.0
Affected: 7.4.2.2
Affected: 7.2.10
Affected: 7.6.1
Affected: 7.4.2.3
Affected: 7.0.8
Affected: 7.6.2
Affected: 7.7.10
Affected: 7.0.8.1
Affected: 7.6.2.1
Affected: 7.7.10.1
Affected: 7.4.2.4
Affected: 7.2.10.2
Affected: 7.4.3
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Cisco Cisco UTD SNORT IPS Engine Software Affected: 3.17.1S
Affected: 16.12.3
Affected: Fuji-16.9.5
Affected: 16.12.4
Affected: 17.3.1a
Affected: 16.6.6
Affected: 16.12.2
Affected: Fuji-16.9.6
Affected: 3.17.0S
Affected: Fuji-16.9.3
Affected: Denali-16.3.7
Affected: Fuji-16.9.2
Affected: Fuji-16.9.4
Affected: Everest-16.6.4
Affected: Everest-16.6.3
Affected: 16.6.5
Affected: Denali-16.3.5
Affected: 17.2.1r
Affected: 17.1.1
Affected: Everest-16.6.2
Affected: 16.6.7a
Affected: Denali-16.3.4
Affected: 16.6.1
Affected: Denali-16.3.9
Affected: Denali-16.3.3
Affected: 16.12.1a
Affected: 17.3.2
Affected: 17.4.1a
Affected: 16.12.5
Affected: 17.5.1
Affected: Fuji-16.9.7
Affected: 16.6.9
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: 16.6.10
Affected: 17.7.1a
Affected: 16.12.6
Affected: Fuji-16.9.8
Affected: 17.6.2
Affected: 17.8.1a
Affected: 16.12.7
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: 16.12.8
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
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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            },
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              "version": "17.9.5f"
            },
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              "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"
            },
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              "status": "affected",
              "version": "17.12.5b"
            },
            {
              "status": "affected",
              "version": "17.12.5c"
            },
            {
              "status": "affected",
              "version": "17.15.4"
            },
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              "status": "affected",
              "version": "17.9.7b"
            },
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              "status": "affected",
              "version": "17.18.1"
            },
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              "version": "17.18.1a"
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              "status": "affected",
              "version": "17.12.6"
            },
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              "status": "affected",
              "version": "17.9.8"
            },
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              "status": "affected",
              "version": "17.15.4c"
            },
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              "status": "affected",
              "version": "17.12.5d"
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            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Multiple\u0026nbsp;Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.\r\n\r\nThis vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS)."
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "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"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-415",
              "description": "Double Free",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-02-12T18:48:34.084Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-snort3-dcerpc-vulns-J9HNF4tH",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH"
        }
      ],
      "source": {
        "advisory": "cisco-sa-snort3-dcerpc-vulns-J9HNF4tH",
        "defects": [
          "CSCwq75339"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "Multiple Cisco Products Snort 3 DCERPC Vulnerabilities"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20026",
    "datePublished": "2026-01-07T16:23:43.283Z",
    "dateReserved": "2025-10-08T11:59:15.352Z",
    "dateUpdated": "2026-02-12T18:48:34.084Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-20026",
      "date": "2026-05-21",
      "epss": "0.00156",
      "percentile": "0.3594"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-20026\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2026-01-07T17:16:02.663\",\"lastModified\":\"2026-01-08T18:08:54.147\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Multiple\u0026nbsp;Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.\\r\\n\\r\\nThis vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L\",\"baseScore\":5.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-415\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-dcerpc-vulns-J9HNF4tH\",\"source\":\"psirt@cisco.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20026\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-07T16:53:28.503254Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-07T16:53:47.292Z\"}}], \"cna\": {\"title\": \"Multiple Cisco Products Snort 3 DCERPC Vulnerabilities\", \"source\": {\"defects\": [\"CSCwq75339\"], \"advisory\": \"cisco-sa-snort3-dcerpc-vulns-J9HNF4tH\", \"discovery\": \"EXTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"CHANGED\", \"version\": \"3.1\", \"baseScore\": 5.8, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L\", 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\"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-dcerpc-vulns-J9HNF4tH\", \"name\": \"cisco-sa-snort3-dcerpc-vulns-J9HNF4tH\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Multiple\u0026nbsp;Cisco products are affected by a vulnerability in the processing of DCE/RPC requests that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to leak sensitive information or to restart, resulting in an interruption of packet inspection.\\r\\n\\r\\nThis vulnerability is due to an error in buffer handling logic when processing DCE/RPC requests, which can result in a buffer use-after-free read. An attacker could exploit this vulnerability by sending a large number of DCE/RPC requests through an established connection that is inspected by Snort 3. A successful exploit could allow the attacker to unexpectedly restart the Snort 3 Detection Engine, which could cause a denial of service (DoS).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-415\", \"description\": \"Double Free\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-02-12T18:48:34.084Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20026\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-12T18:48:34.084Z\", \"dateReserved\": \"2025-10-08T11:59:15.352Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-01-07T16:23:43.283Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.




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.



Detection rules are retrieved from Rulezet.