{"id":"CVE-2021-31894","aliases":["EUVD-2021-18769","GHSA-rq6h-r956-9p9r"],"status":"published","title":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS...","description":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions \u003c V9.1 SP2), SIMATIC PDM (All versions \u003c V9.2 SP2), SIMATIC STEP 7 V5.X (All versions \u003c V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions \u003c V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-12","score":0.00228,"percentile":0.13673,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-732"],"published":"2021-07-13T11:02:58Z","modified":"2026-06-17T03:52:26Z","products":[{"vendor":"siemens","product":"simatic pcs 7 v8.2 and earlier"},{"vendor":"siemens","product":"simatic pcs 7 v9.x"},{"vendor":"siemens","product":"simatic pdm"},{"vendor":"siemens","product":"simatic step 7 v5.x"},{"vendor":"siemens","product":"simatic_pcs_7_firmware"},{"vendor":"siemens","product":"simatic_pdm_firmware"},{"vendor":"siemens","product":"simatic_step_7_firmware"},{"vendor":"siemens","product":"sinamics starter (containing step 7 oem version)"},{"vendor":"siemens","product":"sinamics_starter_firmware"}],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-661034.pdf","tags":["x_refsource_MISC","x_transferred","Patch","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-31894"},{"url":"https://github.com/advisories/GHSA-rq6h-r956-9p9r"}],"sources":{"cve":[{"id":"CVE-2021-31894","description":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions \u003c V9.1 SP2), SIMATIC PDM (All versions \u003c V9.2 SP2), SIMATIC STEP 7 V5.X (All versions \u003c V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions \u003c V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.","status":"published","published":"2021-07-13T11:02:58Z","modified":"2024-08-03T23:10:30.952Z","cwes":["CWE-732"],"updated_at":"2026-11-02T14:33:05.665371Z"}],"euvd":[{"id":"EUVD-2021-18769","description":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions \u003c V9.1 SP2), SIMATIC PDM (All versions \u003c V9.2 SP2), SIMATIC STEP 7 V5.X (All versions \u003c V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions \u003c V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.","status":"published","published":"2021-07-13T11:02:58Z","modified":"2024-08-03T23:10:30Z","updated_at":"2026-11-03T03:24:37.97373Z"}],"ghsa":[{"id":"GHSA-rq6h-r956-9p9r","title":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS...","description":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions), SIMATIC PDM (All versions), SIMATIC STEP 7 V5.X (All versions \u003c V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.","status":"published","published":"2022-05-24T19:07:43Z","modified":"2023-01-30T05:00:42Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-732"],"updated_at":"2026-11-02T14:46:15.885384Z"}],"nvd":[{"id":"CVE-2021-31894","description":"A vulnerability has been identified in SIMATIC PCS 7 V8.2 and earlier (All versions), SIMATIC PCS 7 V9.X (All versions \u003c V9.1 SP2), SIMATIC PDM (All versions \u003c V9.2 SP2), SIMATIC STEP 7 V5.X (All versions \u003c V5.7), SINAMICS STARTER (containing STEP 7 OEM version) (All versions \u003c V5.4 SP2 HF1). A directory containing metafiles relevant to devices' configurations has write permissions. An attacker could leverage this vulnerability by changing the content of certain metafiles and subsequently manipulate parameters or behavior of devices that would be later configured by the affected software.","status":"published","published":"2021-07-13T11:15:09.603Z","modified":"2026-06-17T03:52:26.597Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-732"],"updated_at":"2026-11-02T14:06:55.747384Z"}]}}