{
  "id": "CVE-2021-27562",
  "url": "https://spydr.io/cve/CVE-2021-27562",
  "published": "2021-05-25T19:15:07.737Z",
  "modified": "2026-06-17T03:45:08.407Z",
  "score": 5.5,
  "severity": "medium",
  "cvss_version": "3.1",
  "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "score_source": "NVD",
  "epss": 0.03093,
  "epss_percentile": 0.87334,
  "exploited": true,
  "kev": {
    "added": "2021-11-03",
    "due": "2021-11-17",
    "action": "Apply updates per vendor instructions.",
    "ransomware": "Unknown",
    "name": "Arm Trusted Firmware Out-of-Bounds Write Vulnerability",
    "notes": "https://nvd.nist.gov/vuln/detail/CVE-2021-27562"
  },
  "ssvc_exploitation": "active",
  "vendors": [
    "trustedfirmware"
  ],
  "products": [
    "trustedfirmware trusted firmware-m"
  ],
  "cwes": [
    "CWE-787"
  ],
  "description": "In Arm Trusted Firmware M through 1.2, the NS world may trigger a system halt, an overwrite of secure data, or the printing out of secure data when calling secure functions under the NSPE handler mode.",
  "status": "Analyzed",
  "score_type": "Primary",
  "scores": {
    "cvss_v40": null,
    "cvss_v31": 5.5,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://developer.arm.com/support/arm-security-updates",
      "tags": [
        "Vendor Advisory"
      ]
    },
    {
      "url": "https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst",
      "tags": [
        "Permissions Required",
        "Third Party Advisory"
      ]
    },
    {
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27562",
      "tags": [
        "US Government Resource"
      ]
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27562",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}