{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2023-1671",
  "revision": 1,
  "title": "Sophos Web Appliance — Pre-Auth Command Injection (warn-proceed)",
  "summary": "The warn-proceed handler of the Sophos Web Appliance passes attacker-supplied input into a shell command before any login is required, so anyone who can reach the appliance runs arbitrary code on it.",
  "source_type": "cve",
  "severity": "critical",
  "cvss": {
    "score": 9.8,
    "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.99999,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2023-11-16",
    "prerequisites": "Network access to a Sophos Web Appliance older than 4.3.10.4. No credentials needed."
  },
  "remediation": {
    "patch_available": true,
    "fixed_in": [
      "Sophos Web Appliance 4.3.10.4"
    ]
  },
  "mitre_attack": [
    "T1190",
    "T1059"
  ],
  "kill_chain": "initial_access",
  "recommended_action": "Upgrade the Sophos Web Appliance to 4.3.10.4 or later, or take it out of service; then check it for injected commands and outbound connections you cannot account for.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "title",
        "summary",
        "cvss",
        "severity",
        "exploitation.attack_complexity",
        "exploitation.prerequisites",
        "exploitation.exploit_available",
        "remediation",
        "recommended_action",
        "references"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2023-1671",
      "retrieved_at": "2026-08-07T07:53:55.549Z",
      "confidence": "high",
      "extractor": "claude-code"
    },
    {
      "fields": [
        "exploitation.known_exploited"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-08-07T07:53:55.549Z",
      "confidence": "high",
      "extractor": "claude-code"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2023-1671",
      "retrieved_at": "2026-08-07T07:53:55.549Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-1671",
      "label": "NVD record"
    },
    {
      "type": "vendor_advisory",
      "url": "https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rce",
      "label": "Sophos security advisory"
    },
    {
      "type": "exploit",
      "url": "http://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Command-Injection.html",
      "label": "Public command injection exploit"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-1671",
      "label": "CISA Known Exploited Vulnerabilities entry"
    }
  ],
  "published_at": "2023-04-04T10:15:07.197Z",
  "issued_at": "2026-08-07T07:53:55.549Z",
  "tags": [
    "sophos",
    "web-appliance",
    "command-injection",
    "pre-auth",
    "kev"
  ]
}