{"cve":"CVE-2021-25660","nvd":{"published":"2021-05-12T14:15:11.253","modified":"2026-06-17T03:42:17.950","status":"Modified","description":"A vulnerability has been identified in SIMATIC HMI Comfort Outdoor Panels V15 7\\\" & 15\\\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Outdoor Panels V16 7\\\" & 15\\\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI Comfort Panels V15 4\\\" - 22\\\" (incl. SIPLUS variants) (All versions < V15.1 Update 6), SIMATIC HMI Comfort Panels V16 4\\\" - 22\\\" (incl. SIPLUS variants) (All versions < V16 Update 4), SIMATIC HMI KTP Mobile Panels V15 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V15.1 Update 6), SIMATIC HMI KTP Mobile Panels V16 KTP400F, KTP700, KTP700F, KTP900 and KTP900F (All versions < V16 Update 4), SIMATIC WinCC Runtime Advanced V15 (All versions < V15.1 Update 6), SIMATIC WinCC Runtime Advanced V16 (All versions < V16 Update 4). SmartVNC has an out-of-bounds memory access vulnerability that could be triggered on the server side when sending data from the client, which could result in a Denial-of-Service condition.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-788","CWE-119"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdf","https://cert-portal.siemens.com/productcert/pdf/ssa-538778.pdf"],"products":["siemens:simatic_hmi_comfort_outdoor_panels_15\\\"_firmware","siemens:simatic_hmi_comfort_outdoor_panels_7\\\"_firmware","siemens:simatic_hmi_comfort_panels_22\\\"_firmware","siemens:simatic_hmi_comfort_panels_4\\\"_firmware","siemens:simatic_hmi_ktp_mobile_panels_ktp400f_firmware","siemens:simatic_hmi_ktp_mobile_panels_ktp700_firmware","siemens:simatic_hmi_ktp_mobile_panels_ktp700f_firmware","siemens:simatic_hmi_ktp_mobile_panels_ktp900_firmware","siemens:simatic_hmi_ktp_mobile_panels_ktp900f_firmware","siemens:simatic_wincc_runtime_advanced"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-25660","score":0.00988,"percentile":0.62479,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}