{"id":"CVE-2021-41839","aliases":["EUVD-2021-28840","GHSA-xg99-57hh-rfjv"],"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. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.","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":"2026-11-11","score":0.00275,"percentile":0.20146,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-119","CWE-476"],"published":"2022-02-03T01:37:10Z","modified":"2026-08-11T15:31:36Z","products":[{"vendor":"insyde","product":"insydeh2o"},{"vendor":"siemens","product":"ruggedcom ape1808 - bios"},{"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-2022020","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://security.netapp.com/advisory/ntap-20220217-0016/","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-2021-41839"},{"url":"https://security.netapp.com/advisory/ntap-20220217-0016"},{"url":"https://github.com/advisories/GHSA-xg99-57hh-rfjv"}],"sources":{"cve":[{"id":"CVE-2021-41839","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.","status":"published","published":"2022-02-03T01:37:10Z","modified":"2026-08-11T12:22:11.112Z","updated_at":"2026-11-02T14:32:59.105382Z"}],"euvd":[{"id":"EUVD-2021-28840","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.","status":"published","published":"2022-02-03T01:37:10Z","modified":"2026-08-11T12:22:11Z","updated_at":"2026-11-02T18:02:00.294626Z"}],"ghsa":[{"id":"GHSA-xg99-57hh-rfjv","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 can be used by an attacker to overwrite address location of any of the functions (FreePool,LocateHandleBuffer,HandleProtocol) to the address location of arbitrary code controlled by the attacker. On system call to SWSMI handler, the arbitrary code can be triggered to execute.","status":"published","published":"2022-02-10T00:01:00Z","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-119","CWE-476"],"updated_at":"2026-11-02T15:10:17.573081Z"}],"nvd":[{"id":"CVE-2021-41839","description":"An issue was discovered in NvmExpressDxe in the kernel 5.0 through 5.5 in Insyde InsydeH2O. Because of an Untrusted Pointer Dereference that causes SMM memory corruption, an attacker may be able to write fixed or predictable data to SMRAM. Exploiting this issue could lead to escalating privileges to SMM.","status":"published","published":"2022-02-03T02:15:07.123Z","modified":"2026-08-11T13:17:20.457Z","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":4.6,"vector":"AV:L/AC:L/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-119"],"updated_at":"2026-11-02T14:07:04.178977Z"}]}}