{
  "affected": [
    {
      "database_specific": {
        "unresolved_ranges": [
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "17.4.1"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "6.5.0.5"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.9.14.0"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.9.14.14"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.9.15"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.9.16"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "2.9.17"
              }
            ]
          },
          {
            "events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "2.9.14"
              }
            ]
          }
        ]
      }
    }
  ],
  "details": "Multiple Cisco products are affected by a vulnerability in the Snort application detection engine that could allow an unauthenticated, remote attacker to bypass the configured policies on an affected system. The vulnerability is due to a flaw in the detection algorithm. An attacker could exploit this vulnerability by sending crafted packets that would flow through an affected system. A successful exploit could allow the attacker to bypass the configured policies and deliver a malicious payload to the protected network.",
  "id": "CVE-2021-1236",
  "modified": "2026-03-15T13:47:01.267574575Z",
  "published": "2021-01-13T22:15:20.583Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/02/msg00011.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort-app-bypass-cSBYCATq"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.debian.org/security/2023/dsa-5354"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}