{"id":"CVE-2021-40142","aliases":["EUVD-2021-27329","GHSA-5524-cf37-2p8f"],"status":"published","title":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a...","description":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.02563,"percentile":0.85244,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119"],"published":"2021-08-27T06:51:28Z","modified":"2026-06-17T04:06:35Z","products":[{"vendor":"opcfoundation","product":"local_discover_server"},{"vendor":"siemens","product":"simatic_net_pc"},{"vendor":"siemens","product":"simatic_process_historian_opc_ua_server_firmware"},{"vendor":"siemens","product":"simatic_wincc"},{"vendor":"siemens","product":"simatic_wincc_runtime"},{"vendor":"siemens","product":"simatic_wincc_unified_scada_runtime"},{"vendor":"siemens","product":"telecontrol_server_basic"}],"references":[{"url":"https://opcfoundation.org/security-bulletins/","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://files.opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2021-40142.pdf","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-321292.pdf","tags":["x_refsource_CONFIRM","x_transferred","Patch","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-40142"},{"url":"https://github.com/advisories/GHSA-5524-cf37-2p8f"}],"sources":{"cve":[{"id":"CVE-2021-40142","description":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.","status":"published","published":"2021-08-27T06:51:28Z","modified":"2024-08-04T02:27:31.711Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:33:01.495293Z"}],"euvd":[{"id":"EUVD-2021-27329","description":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.","status":"published","published":"2021-08-27T06:51:28Z","modified":"2024-08-04T02:27:31Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N","level":"high"}],"updated_at":"2026-11-03T03:24:21.368958Z"}],"ghsa":[{"id":"GHSA-5524-cf37-2p8f","title":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a...","description":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.","status":"published","published":"2022-05-24T19:12:24Z","modified":"2023-01-30T05:01:49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:46:29.807452Z"}],"nvd":[{"id":"CVE-2021-40142","description":"In OPC Foundation Local Discovery Server (LDS) before 1.04.402.463, remote attackers can cause a denial of service (DoS) by sending carefully crafted messages that lead to Access of a Memory Location After the End of a Buffer.","status":"published","published":"2021-08-27T07:15:08.63Z","modified":"2026-06-17T04:06:35.103Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:06:57.67549Z"}]}}