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Fencer Vulns
medium 6.7

CVE-2021-28211 json

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

published 2021-06-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-14901

cvss
6.7
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.

Patch / fix

  • edk2 Debian 14, Debian 13, Debian 12 2020.11-1

debian advisories DEBIAN-CVE-2021-28211

  • edk2 Ubuntu 20.04 LTS 0~20191122.bd85bf54-2ubuntu3.2
  • edk2 Ubuntu Pro 16.04 LTS 0~20160408.ffea0a2c-2ubuntu0.2+esm3
  • edk2 Ubuntu Pro 18.04 LTS 0~20180205.c0d9813c-2ubuntu0.3+esm2

ubuntu advisories UBUNTU-CVE-2021-28211

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • edk2 RHEL 8 20200602gitca407c7246bf-4.el8_4.1
  • edk2-ovmf RHEL 8 20200602gitca407c7246bf-4.el8_4.1
  • edk2-aarch64 RHEL 8 20200602gitca407c7246bf-4.el8_4.1

red hat advisories RHSA-2021:2591

  • ovmf SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +10 more 2017+git1510945757.b2662641d5-5.43.1
  • ovmf SLES 12 SP2-BCL 2015+git1462940744.321151f-19.23.1
  • ovmf SLES for SAP 12 SP5, SLES 12 SP5 2017+git1510945757.b2662641d5-3.35.1
  • ovmf SLE Module for Server Applications 15 SP2 201911-7.11.1

suse advisories SUSE-SU-2021:2161-1SUSE-SU-2021:2117-1SUSE-SU-2021:0987-1SUSE-SU-2021:0972-1

  • ovmf openSUSE Tumbleweed 202105-3.4
  • ovmf openSUSE Leap 15.2 201911-lp152.6.11.1

opensuse advisories openSUSE-SU-2024:11134-1openSUSE-SU-2021:0495-1

  • edk2 Rocky Linux 8 20200602gitca407c7246bf-4.el8_4.1

rocky linux advisories RLSA-2021:2591

  • edk2-shell Arch Linux 202011-1

arch linux advisories AVG-1697

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-28211 updated cvss 6.7

edk2: possible heap corruption with LzmaUefiDecompressGetInfo

  • Red Hat Enterprise Linux 7 ovmf, OVMF, AAVMF
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) edk2 20200602gitca407c7246bf-4.el8_4.1, edk2-ovmf 20200602gitca407c7246bf-4.el8_4.1, edk2-aarch64 20200602gitca407c7246bf-4.el8_4.1
    fixed: vendor fix RHSA-2021:2591
  • Red Hat Enterprise Linux 9 edk2, edk2-ovmf, edk2-tools, edk2-aarch64
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugzilla.tianocore.org https://bugzilla.tianocore.org/show_bug.cgi?id=1816 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.7 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 4.6 AV:L/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • TianoCore EDK II

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.