{"cve":"CVE-2020-27339","nvd":{"published":"2021-06-16T16:15:07.897","modified":"2026-08-11T13:17:18.617","status":"Modified","description":"In the kernel in Insyde InsydeH2O 5.x, certain SMM drivers did not correctly validate the CommBuffer and CommBufferSize parameters, allowing callers to corrupt either the firmware or the OS memory. The fixed versions for this issue in the AhciBusDxe, IdeBusDxe, NvmExpressDxe, SdHostDriverDxe, and SdMmcDeviceDxe drivers are 05.16.25, 05.26.25, 05.35.25, 05.43.25, and 05.51.25 (for Kernel 5.1 through 5.5).","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","score":6.7},"cwes":["CWE-20"],"references":["https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","https://security.netapp.com/advisory/ntap-20220216-0005/","https://www.insyde.com/security-pledge/SA-2021001","https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","https://security.netapp.com/advisory/ntap-20220216-0005/"],"products":["insyde:insydeh2o","siemens:ruggedcom_apr1808_firmware","siemens:simatic_field_pg_m5_firmware","siemens:simatic_field_pg_m6_firmware","siemens:simatic_ipc127e_firmware","siemens:simatic_ipc227g_firmware","siemens:simatic_ipc277g_firmware","siemens:simatic_ipc327g_firmware","siemens:simatic_ipc377g_firmware","siemens:simatic_ipc427e_firmware","siemens:simatic_ipc477e_firmware","siemens:simatic_ipc477e_pro_firmware","siemens:simatic_ipc627e_firmware","siemens:simatic_ipc647e_firmware","siemens:simatic_ipc677e_firmware","siemens:simatic_ipc847e_firmware","siemens:simatic_itp1000_firmware"],"source":"nvd","synced_at":"2026-10-19T21:20:07.141963181+00:00"},"epss":{"cve":"CVE-2020-27339","score":0.00317,"percentile":0.24616,"date":"2026-11-01"},"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."]}