Critical severity · published Mar 3, 2022
CVE-2021-38578
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize
9.8
CVSS
1%
EPSS
No
On KEV
Description
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.0% · higher than 63% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ED
Edk2 · Tianocore
through 202202 · source: NVD
KE
Kernel · Insyde
5.0; 5.1; 5.2; 5.3; 5.4; 5.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-38578
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-38578
Issue Tracking
https://bugzilla.tianocore.org/show_bug.cgi?id=3387
Third Party Advisory
https://www.insyde.com/security-pledge/SA-2023024
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html
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