{"id":"CVE-2021-41840","aliases":["EUVD-2021-28841","GHSA-9fr3-m8v5-v6g9"],"status":"published","title":"A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that...","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.","severity":{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.00303,"percentile":0.23211,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-770"],"published":"2022-02-03T01:20:07Z","modified":"2026-08-11T15:31:36Z","products":[{"vendor":"insyde","product":"insydeh2o"},{"vendor":"siemens","product":"simatic field pg m5"},{"vendor":"siemens","product":"simatic field pg m6"},{"vendor":"siemens","product":"simatic ipc127e"},{"vendor":"siemens","product":"simatic ipc227g"},{"vendor":"siemens","product":"simatic ipc277g"},{"vendor":"siemens","product":"simatic ipc327g"},{"vendor":"siemens","product":"simatic ipc377g"},{"vendor":"siemens","product":"simatic ipc427e"},{"vendor":"siemens","product":"simatic ipc477e"},{"vendor":"siemens","product":"simatic ipc477e pro"},{"vendor":"siemens","product":"simatic ipc627e"},{"vendor":"siemens","product":"simatic ipc647e"},{"vendor":"siemens","product":"simatic ipc677e"},{"vendor":"siemens","product":"simatic ipc847e"},{"vendor":"siemens","product":"simatic itp1000"},{"vendor":"siemens","product":"simatic ipc277g pro"},{"vendor":"siemens","product":"siplus ipc427e"}],"references":[{"url":"https://www.insyde.com/security-pledge","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://www.insyde.com/security-pledge/SA-2022018","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20220217-0014/","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","tags":["x_refsource_CONFIRM","x_transferred","Third Party Advisory"]},{"url":"https://www.kb.cert.org/vuls/id/796611"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-306654.html"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-41840"},{"url":"https://security.netapp.com/advisory/ntap-20220217-0014"},{"url":"https://github.com/advisories/GHSA-9fr3-m8v5-v6g9"}],"sources":{"cve":[{"id":"CVE-2021-41840","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.","status":"published","published":"2022-02-03T01:20:07Z","modified":"2026-08-11T12:22:12.302Z","updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2021-28841","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.","status":"published","published":"2022-02-03T01:20:07Z","modified":"2026-08-11T12:22:12Z","updated_at":"2026-11-02T18:02:00.294626Z"}],"ghsa":[{"id":"GHSA-9fr3-m8v5-v6g9","title":"A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that...","description":"A vulnerability exists in SMM (System Management Mode) branch that registers a SWSMI handler that does not sufficiently check or validate the allocated table variable EFI_BOOT_SERVICES. This allows an attacker who is capable of executing code in DXE phase to exploit this vulnerability to escalate privileges to SMM. The attacker can overwrite the LocateProtocol or Freepool memory address location to execute unwanted code.","status":"published","published":"2022-02-10T00:00:59Z","modified":"2026-08-11T15:31:36Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:10:17.025827Z"}],"nvd":[{"id":"CVE-2021-41840","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. There is an SMM callout that allows an attacker to access the System Management Mode and execute arbitrary code. This occurs because of Inclusion of Functionality from an Untrusted Control Sphere.","status":"published","published":"2022-02-03T02:15:07.167Z","modified":"2026-08-11T13:17:20.66Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/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-770"],"updated_at":"2026-11-02T14:07:04.178977Z"}]}}