VulnerabilityModified
CVE-2021-38578
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
CRITICAL 9.8EPSS 1.01%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.01%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.01% probability · 61th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-124, CWE-787
- Affected
- tianocore/edk2 · insyde/kernel
- Source
- infosec@edk2.groups.io
References
- https://bugzilla.tianocore.org/show_bug.cgi?id=3387Issue Tracking, Vendor Advisory
- https://www.insyde.com/security-pledge/SA-2023024Third Party Advisory
- https://bugzilla.tianocore.org/show_bug.cgi?id=3387Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html
- https://www.insyde.com/security-pledge/SA-2023024Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.