CVE-2021-28211: tianocore edk_ii Heap-based Buffer Overflow
CVSS: 6.7v3.1MediumModified
AliasesRHSA-2021:2591UBUNTU-CVE-2021-28211DEBIAN-CVE-2021-28211
Published 11-06-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-28211 is a medium (CVSS 6.7) Heap-based Buffer Overflow vulnerability in tianocore edk_ii. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.7/10
010
Medium · v3.1 (NVD)EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 9 · Related 8Timeline
- 11-06-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A heap overflow in LzmaUefiDecompressGetInfo function in EDK II.
CVSS metrics
5 scores · 4 sources · 2 versionsMedium 6.7Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · Red hatEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Medium 4.6Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.39%
Chance of exploitation in the next 30 days
Percentile
31%
Versus all other CVEs
30-day change
0.00 pp
From 0.39% on 19-09-2026
19-09-202619-10-2026
EPSS score0.39%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.tianocore.org)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-122Heap-based Buffer OverflowA heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Redhat3 products
- edk2< 0:20200602gitca407c7246bf-4.el8_4.1
- edk2-aarch64< 0:20200602gitca407c7246bf-4.el8_4.1
- edk2-ovmf< 0:20200602gitca407c7246bf-4.el8_4.1
Debian1 product
- edk2< 2020.11-1
Ubuntu1 product
- edk2< 0~20160408.ffea0a2c-2ubuntu0.2+esm3 | < 0~20180205.c0d9813c-2ubuntu0.3+esm2 | < 0~20191122.bd85bf54-2ubuntu3.2
4 vendors · 7 products
References
13 links- bugzilla.tianocore.org/show_bug.cgi?id=1816X Refsource MISCExploitIssue TrackingPatchVendor Advisory
