{
  "node_id": "mitre-capec-capec-663-exploitation-of-transient-instruction-execution",
  "title": "MITRE CAPEC-663: Exploitation of Transient Instruction Execution (Standard Attack Pattern - Very High Severity)",
  "domain": "Cybersecurity",
  "version": "1.0.0",
  "last_updated": "2026-05-25",
  "bluf": "MITRE CAPEC-663 (Exploitation of Transient Instruction Execution) is a standard-level attack pattern in the MITRE Common Attack Pattern Enumeration and Classification. An adversary exploits a hardware design flaw in a CPU implementation of transient instruction execution to expose sensitive data and bypass/subvert access control over restricted resources. Typically, the adversary conducts a covert channel attack to target non-discarded microarchitectural changes caused by transient executions such as speculative execution, branch prediction, instruction pipelining, and/or. Likelihood of attack: Low. Typical severity: Very High. Parent pattern for CAPEC-696 Load Value Injection. Maps to weaknesses CWE-1037, CWE-1303, CWE-1264.",
  "paywall": {
    "status": "LOCKED",
    "unlock_cost_usd": "0.01",
    "skyfire_id": "41779894-ece2-4163-9761-b3b1b76e19b0"
  },
  "crosswalks": {
    "_available_keys": [
      "nist_framework",
      "iso_standard",
      "industry_mapping",
      "mitre_attack"
    ],
    "_note": "Full crosswalk values included in vault response"
  },
  "dependencies": [
    "nist-sp-800-53-r5",
    "iso-27001-2022",
    "cis-controls-v8",
    "owasp-asvs-l2"
  ],
  "primary_citations_count": 9
}