{"cve":"CVE-2021-25666","nvd":{"published":"2021-02-09T18:15:51.573","modified":"2026-06-17T03:42:19.073","status":"Modified","description":"A vulnerability has been identified in SCALANCE W780 and W740 (IEEE 802.11n) family (All versions < V6.3). Sending specially crafted packets through the ARP protocol to an affected device could cause a partial denial-of-service, preventing the device to operate normally for a short period of time.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":4.3},"cwes":["CWE-770"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf","https://us-cert.cisa.gov/ics/advisories/icsa-21-040-07","https://cert-portal.siemens.com/productcert/pdf/ssa-686152.pdf","https://us-cert.cisa.gov/ics/advisories/icsa-21-040-07"],"products":["siemens:scalance_w740_firmware","siemens:scalance_w780_firmware"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2021-25666","score":0.00694,"percentile":0.52959,"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."]}