by Kastro
Paper/Archive/CVE-2021-38578

CVE-2021-38578

TianoCore EDK II — Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

EPSS 1%CVSS 9.8
critical.is priorityof 100
42
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 63.4.634 × 2012.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Existing CommBuffer checks in SmmEntryPoint will not catch underflow when computing BufferSize.

Affected

ProductAffectedFixed inSource
EDK IIedk2-stable202208–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
TianoCore (CNA)7.4CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refbugzilla.tianocore.org/show_bug.cgi?id=3387refinsyde.com/security-pledge/SA-2023024reflists.debian.org/debian-lts-announce/2025/06/msg00007.html