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TI-2021-09440 Aliases CVE-2021-28211GHSA-9f7r-6p3j-j5wj

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

Priority LOW 30CWE-122Published · Updated

Key facts

Attack vector
Local
Privileges required
High
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Partial Red Hat: 1 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-122 and the CVSS impact.

Summary

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

Why it matters now

EPSS 0.00386 32nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial Red Hat: 1 advisoryRed Hat: 1 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TianoCoreEDK IIedk2-stable202008—No fix listedCNA
  • EDK II VendorTianoCore Affected edk2-stable202008 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tianocore:edk2:202008:*:*:*:*:*:*:*202008VulnerableTianoCore
  • cpe:2.3:a:tianocore:edk2:202008:*:*:*:*:*:*:* Versions 202008 Vulnerable ·TianoCore

Remediation

Red Hat 1 advisory

  • RHSA-2021:2591 Released 2021-06-29 · Red Hat rating Moderate
    edk2 security update
    • Red Hat Enterprise Linux AppStream (v. 8) edk2-20200602gitca407c7246bf-4.el8_4.1, edk2-aarch64-20200602gitca407c7246bf-4.el8_4.1, edk2-ovmf-20200602gitca407c7246bf-4.el8_4.1

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:2591
Not affected: 1 product
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28211
  2. 2026-10-03 Alias added: GHSA-9f7r-6p3j-j5wj

References

Exploit 1

  • TI-2026-79288 Out-of-bounds write in Google Brotli decoder KEVCVSS 4.0CRITICAL 9.2
  • TI-2023-24240 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
  • TI-2023-24238 Infinite loop in EDK II Network Package CVSS 3.1HIGH 7.5
  • TI-2023-24235 Buffer Overflow in EDK II Network Package CVSS 3.1HIGH 8.8
  • TI-2023-26565 An insecure default to allow UEFI Shell in EDK2 was left enabled in Ubuntu's EDK2. CVSS 3.1MEDIUM 6.7
  • TI-2023-24236 Out-of-Bounds Read in EDK II Network Package CVSS 3.1MEDIUM 6.5
See all 33 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences