{"schema":"threatline.record/2","record":{"id":"CVE-2021-27562","aliases":[],"summary":"Arm Trusted Firmware Out-of-Bounds Write Vulnerability","details":"Arm Trusted Firmware contains an out-of-bounds write vulnerability allowing the non-secure (NS) world to trigger a system halt, overwrite secure data, or print out secure data when calling secure functions under the non-secure processing environment (NSPE) handler mode. This vulnerability affects Yealink Device Management servers.","categories":["Unclassified"],"product":"Trusted Firmware","vendor":"Arm","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2021-27562","source_modified_at":"2025-10-21T23:25:45.217Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"n/a","vendor":"n/a","versions":[{"status":"affected","version":"n/a"}],"defaultStatus":null}],"fixed_versions":[],"cvss":5.5,"severity":"Medium","kev":{"listed":true,"date_added":"2021-11-03","due_date":"2021-11-17","required_action":"Apply updates per vendor instructions.","ransomware_campaign_use":"Unknown"},"epss":{"probability":0.0306,"percentile":0.87521,"score_date":"2026-10-23"},"published_at":"2021-05-25T18:27:20.000Z","modified_at":"2025-10-21T23:25:45.217Z","provenance":[{"source":"CISA KEV","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T17:00:09.9001Z"},{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2021-27562","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2025-10-21T23:25:45.217Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2021-27562","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CISA KEV","CVE List","EPSS"],"references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-27562","source":"CISA KEV"},{"source":"CVE List","url":"https://developer.arm.com/support/arm-security-updates","tags":["x_refsource_MISC","x_transferred"]},{"source":"CVE List","url":"https://git.trustedfirmware.org/TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst","tags":["x_refsource_CONFIRM","x_transferred"]},{"source":"CVE List","url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27562","tags":["government-resource"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"active","automatable":"no","technical_impact":"partial","assessed_at":"2025-02-04T19:42:33.875087Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2025-10-21T23:25:45.217Z","content_hash":"1e28a2543bc986d516dc03d22bdb6b9536cfe2527ae2def4090b5228edcde9b5"}}