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01 Record

CVE-2021-38578

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

HighPUBLISHEDCNA: TianoCore
CNA base score7.4 CVSS v3.xCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
View raw JSON

02 Description

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

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.01% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 63.0% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-03-03 21:53Z4 YR AGO
Last updated
2025-11-03 19:26Z12 MO AGO
Reserved
2021-08-11
Assigning CNA
TianoCore
Record state
PUBLISHED
Severity
High (CVSS 7.4)
CNA CVSS vector
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
Weaknesses
  • CWE-124Buffer Underwrite ('Buffer Underflow')Base
  • CWE-787Out-of-bounds WriteBase
Data version
5.2
Document digest
98515b6a18fd9b72423afcbe45b4f3c368cff8f3c281a3edf6a37ca95d008d41

05 Affected products

VendorProductVersionsPlatforms
TianoCoreEDK IIedk2-stable202208—

06 References

07 Fixed in

AlmaLinux 9

  • edk2-aarch64
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-ovmf
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-tools
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-tools-doc
    Fixed in 20221207gitfff6d81270b5-9.el9_2

Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

CloudLinux 9

  • edk2-aarch64
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-ovmf
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-tools
    Fixed in 20221207gitfff6d81270b5-9.el9_2
  • edk2-tools-doc
    Fixed in 20221207gitfff6d81270b5-9.el9_2

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.

Debian 12

  • edk2
    Fixed in 2022.11-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

  • edk2
    Fixed in 2022.11-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

  • edk2
    Fixed in 2022.11-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 20.04 LTS

  • edk2
    Fixed in 0~20191122.bd85bf54-2ubuntu3.6

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu 22.04 LTS

  • edk2
    Fixed in 2022.02-3ubuntu0.22.04.3

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 16.04 LTS

  • edk2
    Fixed in 0~20160408.ffea0a2c-2ubuntu0.2+esm3
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

Ubuntu Pro 18.04 LTS

  • edk2
    Fixed in 0~20180205.c0d9813c-2ubuntu0.3+esm2
    Available with Ubuntu Pro: https://ubuntu.com/pro

Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.

A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.