{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2024-20359",
  "revision": 1,
  "title": "Cisco firewalls — an implant that survives the reboot",
  "summary": "A legacy preload path in Cisco's firewall software (ASA and FTD) reads a file from flash storage without validating it, so an administrator can plant code that runs after the next reload and persists across reboots. Espionage crews used it.",
  "source_type": "cve",
  "severity": "high",
  "cvss": {
    "score": 6,
    "vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N",
    "version": "3.1"
  },
  "epss": 0.19434,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": true,
    "attack_complexity": "low",
    "kev_added": "2024-04-24",
    "prerequisites": "The attacker must already hold administrator access to the device."
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1059"
  ],
  "kill_chain": "persistence",
  "recommended_action": "Install the fixed release named in the Cisco advisory, then inspect device flash for files nobody put there — the campaign that used this left an implant that outlives a reload.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2024-20359",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "exploitation.known_exploited",
        "exploitation.kev_added"
      ],
      "source": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "epss"
      ],
      "source": "https://api.first.org/data/v1/epss?cve=CVE-2024-20359",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "scrty-crds-pipeline/0.1"
    },
    {
      "fields": [
        "title",
        "summary",
        "severity",
        "remediation",
        "mitre_attack",
        "kill_chain",
        "recommended_action",
        "confidence",
        "tags",
        "exploitation.prerequisites"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2024-20359",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-20359",
      "label": "NVD record"
    },
    {
      "type": "cisa",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "label": "CISA Known Exploited Vulnerabilities catalog"
    },
    {
      "type": "vendor_advisory",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-persist-rce-FLsNXF4h"
    },
    {
      "type": "exploit",
      "url": "https://blog.talosintelligence.com/arcanedoor-new-espionage-focused-campaign-found-targeting-perimeter-network-devices/"
    }
  ],
  "published_at": "2024-04-24T19:15:46.943Z",
  "issued_at": "2026-09-24T12:52:19.575Z",
  "tags": [
    "cisco",
    "asa",
    "firepower",
    "firewall",
    "persistence",
    "espionage",
    "kev"
  ]
}