CVE•Published 2022-02-03•Modified 2026-08-11•1 article on news•6 live references•NVD data
CVE-2021-33627Insyde · Insydeh2o
Vulnerability data via NVD (ingested)
CVSS v3.1
8.2
HIGH
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS percentile
25
Exploit Prediction Scoring System · top 75% of all CVEs
Description
An issue was discovered in Insyde InsydeH2O Kernel 5.0 before 05.09.11, 5.1 before 05.17.11, 5.2 before 05.27.11, 5.3 before 05.36.11, 5.4 before 05.44.11, and 5.5 before 05.52.11 affecting FwBlockServiceSmm. 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.
Timeline
Published 2022-02-03
Modified 2026-08-11
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-33627Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Insyde Insydeh2o"All exposed Insyde Insydeh2o instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Insydeh2o"HTTP body or banner mentions "Insydeh2o" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-33627Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-33627Censys host search filtered to this CVE id.
grep.app
CVE-2021-33627Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-33627GitHub code search for direct mentions.
Google dork
"CVE-2021-33627" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub
No public proof-of-concept repositories found for CVE-2021-33627 on GitHub.