{"cve":"CVE-2021-25667","nvd":{"published":"2021-03-15T17:15:21.690","modified":"2026-06-17T03:42:19.190","status":"Modified","description":"A vulnerability has been identified in RUGGEDCOM RM1224 (All versions >= V4.3 and < V6.4), SCALANCE M-800 (All versions >= V4.3 and < V6.4), SCALANCE S615 (All versions >= V4.3 and < V6.4), SCALANCE SC-600 Family (All versions >= V2.0 and < V2.1.3), SCALANCE XB-200 (All versions < V4.1), SCALANCE XC-200 (All versions < V4.1), SCALANCE XF-200BA (All versions < V4.1), SCALANCE XM400 (All versions < V6.2), SCALANCE XP-200 (All versions < V4.1), SCALANCE XR-300WG (All versions < V4.1), SCALANCE XR500 (All versions < V6.2). Affected devices contain a stack-based buffer overflow vulnerability in the handling of STP BPDU frames that could allow a remote attacker to trigger a denial-of-service condition or potentially remote code execution. Successful exploitation requires the passive listening feature of the device to be active.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-121","CWE-787"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf","https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03","https://cert-portal.siemens.com/productcert/pdf/ssa-979775.pdf","https://us-cert.cisa.gov/ics/advisories/icsa-21-068-03"],"products":["siemens:ruggedcom_rm1224_firmware","siemens:scalance_m-800_firmware","siemens:scalance_s615_firmware","siemens:scalance_sc622-2c_firmware","siemens:scalance_sc632-2c_firmware","siemens:scalance_sc636-2c_firmware","siemens:scalance_sc642-2c_firmware","siemens:scalance_sc646-2c_firmware","siemens:scalance_x300wg_firmware","siemens:scalance_xb-200_firmware","siemens:scalance_xc-200_firmware","siemens:scalance_xf-200ba_firmware","siemens:scalance_xm400_firmware","siemens:scalance_xp-200_firmware","siemens:scalance_xr500_firmware"],"source":"nvd","synced_at":"2026-10-19T21:15:50.279857260+00:00"},"epss":{"cve":"CVE-2021-25667","score":0.00945,"percentile":0.61099,"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."]}