{"id":"CVE-2020-8936","aliases":["EUVD-2020-29767","GHSA-mjhf-5xg4-c757"],"status":"published","title":"Arbitrary enclave memory overwrite vulnerability in ECall ecall_restore","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-08","score":0.00135,"percentile":0.02983,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-125"],"published":"2020-12-15T14:55:33Z","modified":"2026-10-20T14:14:05Z","products":[{"vendor":"google","product":"asylo"},{"vendor":"google llc","product":"asylo"}],"references":[{"url":"https://github.com/google/asylo/commit/83036fd841d33baa7e039f842d131aa7881fdcc2","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-8936"},{"url":"https://github.com/advisories/GHSA-mjhf-5xg4-c757"}],"sources":{"cve":[{"id":"CVE-2020-8936","title":"Arbitrary enclave memory overwrite vulnerability in ECall ecall_restore","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","status":"published","published":"2020-12-15T14:55:33Z","modified":"2024-08-04T10:12:11.009Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:35:50.545879Z"}],"euvd":[{"id":"EUVD-2020-29767","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","status":"published","published":"2020-12-15T14:55:33Z","modified":"2024-08-04T10:12:11Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T03:07:55.71159Z"}],"ghsa":[{"id":"GHSA-mjhf-5xg4-c757","title":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to...","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","status":"published","published":"2022-05-24T17:36:36Z","modified":"2023-01-29T05:04:46Z","cwes":["CWE-125"],"updated_at":"2026-11-02T14:45:37.901426Z"}],"nvd":[{"id":"CVE-2020-8936","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","status":"published","published":"2020-12-15T15:15:13.127Z","modified":"2026-06-17T03:27:12.017Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":2.1,"vector":"AV:L/AC:L/Au:N/C:P/I:N/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-125"],"updated_at":"2026-11-02T14:06:27.73474Z"}],"osv":[{"id":"CVE-2020-8936","description":"An arbitrary memory overwrite vulnerability in Asylo versions up to 0.6.0 allows an attacker to make a host call to UntrustedCall. UntrustedCall failed to validate the buffer range within sgx_params and allowed the host to return a pointer that was an address within the enclave memory. This allowed an attacker to read memory values from within the enclave.","status":"published","published":"2020-12-15T15:15:13.127Z","modified":"2026-10-20T14:14:05.354070114Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:17.663289Z"}]}}