{"id":"CVE-2021-25659","aliases":["EUVD-2021-12551","GHSA-qhxf-2fw5-w33w"],"status":"published","title":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation...","description":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \u003c V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.","severity":{"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","from":"nvd"},"epss":{"day":"2026-11-10","score":0.01037,"percentile":0.64211,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-400"],"published":"2021-08-10T10:35:25Z","modified":"2026-06-17T03:42:17Z","products":[{"vendor":"siemens","product":"automation license manager 5"},{"vendor":"siemens","product":"automation license manager 6"},{"vendor":"siemens","product":"automation_license_manager"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-158827.pdf","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-25659"},{"url":"https://github.com/advisories/GHSA-qhxf-2fw5-w33w"}],"sources":{"cve":[{"id":"CVE-2021-25659","description":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \u003c V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.","status":"published","published":"2021-08-10T10:35:25Z","modified":"2024-08-03T20:11:27.685Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:32:59.802172Z"}],"euvd":[{"id":"EUVD-2021-12551","description":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \u003c V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.","status":"published","published":"2021-08-10T10:35:25Z","modified":"2024-08-03T20:11:27Z","updated_at":"2026-11-03T03:24:52.420769Z"}],"ghsa":[{"id":"GHSA-qhxf-2fw5-w33w","title":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation...","description":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \u003c V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.","status":"published","published":"2022-05-24T19:10:37Z","modified":"2023-01-30T05:01:20Z","cwes":["CWE-400"],"updated_at":"2026-11-02T14:46:23.547617Z"}],"nvd":[{"id":"CVE-2021-25659","description":"A vulnerability has been identified in Automation License Manager 5 (All versions), Automation License Manager 6 (All versions \u003c V6.0 SP9 Update 2). Sending specially crafted packets to port 4410/tcp of an affected system could lead to extensive memory being consumed and as such could cause a denial-of-service preventing legitimate users from using the system.","status":"published","published":"2021-08-10T11:15:08.18Z","modified":"2026-06-17T03:42:17.843Z","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":"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-400"],"updated_at":"2026-11-02T14:06:56.943671Z"}]}}