{
  "crds_version": "0.1",
  "kind": "base",
  "id": "crds:cve-2021-25394",
  "revision": 1,
  "title": "Samsung — a race in the charger driver leaves a write",
  "summary": "A race in the charger driver on Samsung devices leaves memory in use after it was freed, which an attacker already holding radio privileges turns into a write of their choosing. The May 2021 release fixes it.",
  "source_type": "cve",
  "severity": "medium",
  "cvss": {
    "score": 6.4,
    "vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
    "version": "3.1"
  },
  "epss": 0.00401,
  "exploitation": {
    "known_exploited": true,
    "exploit_available": false,
    "attack_complexity": "high",
    "kev_added": "2023-06-29",
    "prerequisites": "Radio privileges on the device must already be compromised, and the race must be won."
  },
  "remediation": {
    "patch_available": true
  },
  "mitre_attack": [
    "T1068"
  ],
  "kill_chain": "privilege_escalation",
  "recommended_action": "Install the May 2021 Samsung security update or later. Radio privileges come first, so treat this as a step inside a chain rather than an opening move.",
  "confidence": "high",
  "provenance": [
    {
      "fields": [
        "cvss",
        "exploitation.attack_complexity",
        "exploitation.exploit_available",
        "references",
        "published_at"
      ],
      "source": "https://nvd.nist.gov/vuln/detail/CVE-2021-25394",
      "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-2021-25394",
      "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-2021-25394",
      "retrieved_at": "2026-09-24T12:52:19.575Z",
      "confidence": "high",
      "extractor": "claude-code"
    }
  ],
  "references": [
    {
      "type": "cve",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-25394",
      "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://security.samsungmobile.com/securityUpdate.smsb?year=2021&month=5"
    }
  ],
  "published_at": "2021-06-11T15:15:08.957Z",
  "issued_at": "2026-09-24T12:52:19.575Z",
  "tags": [
    "samsung",
    "android",
    "driver",
    "race-condition",
    "use-after-free",
    "kev"
  ]
}