What’s Vulnerable › Vulnerabilities

CVE-2021-38578

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-03 · updated 2026-06-17
• Weakness: CWE-124

Description

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

Affected products

• Insyde Kernel: 5.0, 5.1, 5.2, 5.3, 5.4, 5.5
• TianoCore edk2: through 202202

References

• https://bugzilla.tianocore.org/show_bug.cgi?id=3387
• https://www.insyde.com/security-pledge/SA-2023024
• https://bugzilla.tianocore.org/show_bug.cgi?id=3387
• https://lists.debian.org/debian-lts-announce/2025/06/msg00007.html
• https://www.insyde.com/security-pledge/SA-2023024

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