{"id":"CVE-2021-33625","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-33625","generatedAt":"2026-10-28T02:58:51.113Z","title":"Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.","description":"An issue was discovered in Kernel 5.x in Insyde InsydeH2O, affecting HddPassword. Software SMI services that use the Communicate() function of the EFI_SMM_COMMUNICATION_PROTOCOL do not check whether the address of the buffer is valid, which allows use of SMRAM, MMIO, or OS kernel addresses.","published":"2022-02-03T02:15:07.000Z","lastModified":"2026-08-11T13:17:19.000Z","status":"Modified","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"},"cwe":["CWE-119"],"affected":["insyde/insydeh2o","netapp/fas\\/aff bios","siemens/ruggedcom ape1808 firmware","siemens/simatic field pg m5 firmware","siemens/simatic ipc127e firmware","siemens/simatic itp1000 firmware","siemens/simatic ipc277g firmware","siemens/simatic ipc227g 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 field pg m6 firmware"],"epss":{"score":0.00315,"percentile":0.24226,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://security.netapp.com/advisory/ntap-20220222-0004/","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://www.insyde.com/security-pledge","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://www.insyde.com/security-pledge/SA-2022014","tags":["Vendor Advisory"],"source":"cve@mitre.org"},{"url":"https://cert-portal.siemens.com/productcert/pdf/ssa-306654.pdf","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20220222-0004/","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.insyde.com/security-pledge","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.insyde.com/security-pledge/SA-2022014","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.kb.cert.org/vuls/id/796611","source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-306654.html","source":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-33625","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}