CVE-2026-76445 (GCVE-0-2026-76445)
Vulnerability from cvelistv5
Published
2026-10-21 16:14
Modified
2026-10-22 19:11
CWE
  • CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')
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 detection engine to unexpectedly restart, resulting in a denial of service (DoS) condition. The vulnerability is due to a flaw in logic handling when General Packet Radio Service (GPRS) Tunneling Protocol (GTP) extension headers are processed within the codec. An attacker could exploit this vulnerability by sending a crafted, fragmented UDP datagram that contains these headers to the Snort 3 Detection Engine of an affected device. A successful exploit could allow the attacker to cause the detection engine to enter an infinite loop, resulting in a DoS condition.
Impacted products
Vendor Product Version
Cisco Cisco Open Source Snort3 Version: 3.12.2.0
Version: 3.1.2.0
Version: 3.1.3.0
Version: 3.1.4.0
Version: 3.1.5.0
Version: 3.1.6.0
Version: 3.1.7.0
Version: 3.1.8.0
Version: 3.1.9.0
Version: 3.1.10.0
Version: 3.1.12.0
Version: 3.1.13.0
Version: 3.1.14.0
Version: 3.1.15.0
Version: 3.1.16.0
Version: 3.1.17.0
Version: 3.1.18.0
Version: 3.1.19.0
Version: 3.1.20.0
Version: 3.1.21.0
Version: 3.1.22.0
Version: 3.1.23.0
Version: 3.1.24.0
Version: 3.1.25.0
Version: 3.1.27.0
Version: 3.1.28.0
Version: 3.1.29.0
Version: 3.1.30.0
Version: 3.1.31.0
Version: 3.1.32.0
Version: 3.1.36.0
Version: 3.1.38.0
Version: 3.1.39.0
Version: 3.1.40.0
Version: 3.1.41.0
Version: 3.1.42.0
Version: 3.1.43.0
Version: 3.1.45.0
Version: 3.1.47.0
Version: 3.1.48.0
Version: 3.1.50.0
Version: 3.1.51.0
Version: 3.1.52.0
Version: 3.1.53.0
Version: 3.1.55.0
Version: 3.1.56.0
Version: 3.1.57.0
Version: 3.1.58.0
Version: 3.1.59.0
Version: 3.1.60.0
Version: 3.1.61.0
Version: 3.1.62.0
Version: 3.1.63.0
Version: 3.1.64.0
Version: 3.1.65.0
Version: 3.1.66.0
Version: 3.1.67.0
Version: 3.1.69.0
Version: 3.1.70.0
Version: 3.1.71.0
Version: 3.1.72.0
Version: 3.1.73.0
Version: 3.1.74.0
Version: 3.1.75.0
Version: 3.1.76.0
Version: 3.1.77.0
Version: 3.1.78.0
Version: 3.1.81.0
Version: 3.1.82.0
Version: 3.1.83.0
Version: 3.1.84.0
Version: 3.2.1.0
Version: 3.2.2.0
Version: 3.3.0.0
Version: 3.3.1.0
Version: 3.3.2.0
Version: 3.3.3.0
Version: 3.3.4.0
Version: 3.3.5.0
Version: 3.3.7.0
Version: 3.5.0.0
Version: 3.5.1.0
Version: 3.8.1.0
Version: 3.6.0.0
Version: 3.6.2.0
Version: 3.9.3.0
Version: 3.7.2.0
Version: 3.7.0.0
Version: 3.9.6.0
Version: 3.10.0.0
Version: 3.10.2.0
Version: 3.7.4.0
Version: 3.9.0.0
Version: 3.5.2.0
Version: 3.12.1.0
Version: 3.6.1.0
Version: 3.9.2.0
Version: 3.6.3.0
Version: 3.9.5.0
Version: 3.7.1.0
Version: 3.9.7.0
Version: 3.7.3.0
Version: 3.10.1.0
Version: 3.9.1.0
Version: 3.11.1.0
Create a notification for this product.
   Cisco Cisco Secure Firewall Threat Defense (FTD) Software Version: 7.0.0
Version: 7.0.0.1
Version: 7.0.1
Version: 7.0.1.1
Version: 7.0.2
Version: 7.2.0
Version: 7.0.2.1
Version: 7.0.3
Version: 7.2.0.1
Version: 7.0.4
Version: 7.2.1
Version: 7.0.5
Version: 7.3.0
Version: 7.2.2
Version: 7.2.3
Version: 7.3.1
Version: 7.2.4
Version: 7.0.6
Version: 7.2.5
Version: 7.2.4.1
Version: 7.3.1.1
Version: 7.4.0
Version: 7.0.6.1
Version: 7.2.5.1
Version: 7.4.1
Version: 7.2.6
Version: 7.0.6.2
Version: 7.4.1.1
Version: 7.2.7
Version: 7.2.5.2
Version: 7.3.1.2
Version: 7.2.8
Version: 7.6.0
Version: 7.4.2
Version: 7.2.8.1
Version: 7.0.6.3
Version: 7.4.2.1
Version: 7.2.9
Version: 7.0.7
Version: 7.7.0
Version: 7.4.2.2
Version: 7.2.10
Version: 7.6.1
Version: 7.4.2.3
Version: 7.0.8
Version: 7.6.2
Version: 7.7.10
Version: 7.7.11
Version: 7.0.8.1
Version: 7.6.2.1
Version: 7.7.10.1
Version: 7.4.2.4
Version: 7.2.10.2
Version: 7.4.3
Version: 7.6.4
Version: 10.0.0
Version: 7.4.4
Version: 7.0.9
Version: 7.2.11
Version: 7.4.7
Create a notification for this product.
   Cisco Cisco UTD SNORT IPS Engine Software Version: 17.12.1a
Version: 17.12.2
Version: 17.12.3
Version: 17.12.4
Version: 17.12.3a
Version: 17.15.1a
Version: 17.12.4a
Version: 17.15.2c
Version: 17.12.4b
Version: 17.15.2a
Version: 17.12.5
Version: 17.12.5a
Version: 17.15.3a
Version: 17.15.3
Version: 17.12.5b
Version: 17.12.5c
Version: 17.15.4
Version: 17.18.1
Version: 17.18.1a
Version: 17.12.6
Version: 17.15.4c
Version: 17.12.5d
Version: 17.18.2
Version: 17.15.5
Version: 17.15.5a
Version: 17.12.7
Version: 17.12.7a
Version: 17.12.7b
Version: 17.18.3a
Version: 17.12.8
Version: 17.15.6
Version: 17.18.4
Create a notification for this product.
Show details on NVD website


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              "version": "17.12.4a"
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              "version": "17.15.2c"
            },
            {
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              "version": "17.12.4b"
            },
            {
              "status": "affected",
              "version": "17.15.2a"
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            {
              "status": "affected",
              "version": "17.12.5"
            },
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              "status": "affected",
              "version": "17.12.5a"
            },
            {
              "status": "affected",
              "version": "17.15.3a"
            },
            {
              "status": "affected",
              "version": "17.15.3"
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            {
              "status": "affected",
              "version": "17.12.5b"
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            {
              "status": "affected",
              "version": "17.12.5c"
            },
            {
              "status": "affected",
              "version": "17.15.4"
            },
            {
              "status": "affected",
              "version": "17.18.1"
            },
            {
              "status": "affected",
              "version": "17.18.1a"
            },
            {
              "status": "affected",
              "version": "17.12.6"
            },
            {
              "status": "affected",
              "version": "17.15.4c"
            },
            {
              "status": "affected",
              "version": "17.12.5d"
            },
            {
              "status": "affected",
              "version": "17.18.2"
            },
            {
              "status": "affected",
              "version": "17.15.5"
            },
            {
              "status": "affected",
              "version": "17.15.5a"
            },
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
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          "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 detection engine to unexpectedly restart, resulting in a denial of service (DoS) condition.\r\n\r\nThe vulnerability is due to a flaw in logic handling when General Packet Radio Service (GPRS) Tunneling Protocol (GTP) extension headers are processed within the codec. An attacker could exploit this vulnerability by sending a crafted, fragmented UDP datagram that contains these headers to the Snort 3 Detection Engine of an affected device. A successful exploit could allow the attacker to cause the detection engine to enter an infinite loop, resulting in a DoS condition."
        }
      ],
      "exploits": [
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          "value": "The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
            "version": "3.1"
          },
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)",
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            }
          ]
        }
      ],
      "providerMetadata": {
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-snort3-gtpcodec-dos-Rmecfepz",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gtpcodec-dos-Rmecfepz"
        }
      ],
      "source": {
        "advisory": "cisco-sa-snort3-gtpcodec-dos-Rmecfepz",
        "defects": [
          "CSCwu17795"
        ],
        "discovery": "INTERNAL"
      },
      "title": "Multiple Cisco Products Snort 3 Denial of Service Vulnerability"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-76445",
    "datePublished": "2026-10-21T16:14:39.374Z",
    "dateReserved": "2026-08-19T12:02:03.635Z",
    "dateUpdated": "2026-10-22T19:11:11.783Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Multiple Cisco Products Snort 3 Denial of Service Vulnerability\", \"source\": {\"defects\": [\"CSCwu17795\"], \"advisory\": \"cisco-sa-snort3-gtpcodec-dos-Rmecfepz\", \"discovery\": \"INTERNAL\"}, \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.3, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"LOW\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Open Source Snort3\", \"versions\": [{\"status\": \"affected\", \"version\": \"3.12.2.0\"}, {\"status\": \"affected\", \"version\": \"3.1.2.0\"}, {\"status\": \"affected\", \"version\": \"3.1.3.0\"}, {\"status\": \"affected\", \"version\": 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{\"status\": \"affected\", \"version\": \"3.1.24.0\"}, {\"status\": \"affected\", \"version\": \"3.1.25.0\"}, {\"status\": \"affected\", \"version\": \"3.1.27.0\"}, {\"status\": \"affected\", \"version\": \"3.1.28.0\"}, {\"status\": \"affected\", \"version\": \"3.1.29.0\"}, {\"status\": \"affected\", \"version\": \"3.1.30.0\"}, {\"status\": \"affected\", \"version\": \"3.1.31.0\"}, {\"status\": \"affected\", \"version\": \"3.1.32.0\"}, {\"status\": \"affected\", \"version\": \"3.1.36.0\"}, {\"status\": \"affected\", \"version\": \"3.1.38.0\"}, {\"status\": \"affected\", \"version\": \"3.1.39.0\"}, {\"status\": \"affected\", \"version\": \"3.1.40.0\"}, {\"status\": \"affected\", \"version\": \"3.1.41.0\"}, {\"status\": \"affected\", \"version\": \"3.1.42.0\"}, {\"status\": \"affected\", \"version\": \"3.1.43.0\"}, {\"status\": \"affected\", \"version\": \"3.1.45.0\"}, {\"status\": \"affected\", \"version\": \"3.1.47.0\"}, {\"status\": \"affected\", \"version\": \"3.1.48.0\"}, 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\"affected\", \"version\": \"3.3.3.0\"}, {\"status\": \"affected\", \"version\": \"3.3.4.0\"}, {\"status\": \"affected\", \"version\": \"3.3.5.0\"}, {\"status\": \"affected\", \"version\": \"3.3.7.0\"}, {\"status\": \"affected\", \"version\": \"3.5.0.0\"}, {\"status\": \"affected\", \"version\": \"3.5.1.0\"}, {\"status\": \"affected\", \"version\": \"3.8.1.0\"}, {\"status\": \"affected\", \"version\": \"3.6.0.0\"}, {\"status\": \"affected\", \"version\": \"3.6.2.0\"}, {\"status\": \"affected\", \"version\": \"3.9.3.0\"}, {\"status\": \"affected\", \"version\": \"3.7.2.0\"}, {\"status\": \"affected\", \"version\": \"3.7.0.0\"}, {\"status\": \"affected\", \"version\": \"3.9.6.0\"}, {\"status\": \"affected\", \"version\": \"3.10.0.0\"}, {\"status\": \"affected\", \"version\": \"3.10.2.0\"}, {\"status\": \"affected\", \"version\": \"3.7.4.0\"}, {\"status\": \"affected\", \"version\": \"3.9.0.0\"}, {\"status\": \"affected\", \"version\": \"3.5.2.0\"}, {\"status\": \"affected\", \"version\": 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\"versions\": [{\"status\": \"affected\", \"version\": \"17.12.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.12.3a\"}, {\"status\": \"affected\", \"version\": \"17.15.1a\"}, {\"status\": \"affected\", \"version\": \"17.12.4a\"}, {\"status\": \"affected\", \"version\": \"17.15.2c\"}, {\"status\": \"affected\", \"version\": \"17.12.4b\"}, {\"status\": \"affected\", \"version\": \"17.15.2a\"}, {\"status\": \"affected\", \"version\": \"17.12.5\"}, {\"status\": \"affected\", \"version\": \"17.12.5a\"}, {\"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\": \"17.18.1\"}, 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[{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-gtpcodec-dos-Rmecfepz\", \"name\": \"cisco-sa-snort3-gtpcodec-dos-Rmecfepz\"}], \"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 detection engine to unexpectedly restart, resulting in a denial of service (DoS) condition.\\r\\n\\r\\nThe vulnerability is due to a flaw in logic handling when General Packet Radio Service (GPRS) Tunneling Protocol (GTP) extension headers are processed within the codec. An attacker could exploit this vulnerability by sending a crafted, fragmented UDP datagram that contains these headers to the Snort 3 Detection Engine of an affected device. A successful exploit could allow the attacker to cause the detection engine to enter an infinite loop, resulting in a DoS condition.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-835\", \"description\": \"Loop with Unreachable Exit Condition (\u0027Infinite Loop\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-10-21T16:14:39.374Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-76445\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-21T17:16:58.668961Z\"}}}], \"providerMetadata\": {\"shortName\": \"CISA-ADP\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"dateUpdated\": \"2026-10-22T13:36:19.653Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-76445\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T16:14:39.374Z\", \"dateReserved\": \"2026-08-19T12:02:03.635Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-10-21T16:14:39.374Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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