CVE-2021-20225: fedoraproject fedora Out-of-bounds Write
Vulnerability summary
CVE-2021-20225 is a high (CVSS 7.2) Out-of-bounds Write vulnerability in fedoraproject fedora. EPSS estimates a 1.01% chance of exploitation in the next 30 days, higher than 62.4% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 25 · Related 10Timeline
- 03-03-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS metrics
5 scores · 4 sources · 2 versions- 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
- NVDNIST6.7MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.01%
Chance of exploitation in the next 30 days
Percentile
62%
Versus all other CVEs
30-day change
0.00 pp
From 1.01% on 18-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Redhat5 products
- enterprise_linuxEOL7.0 | 8.0
- enterprise_linux_server_aus7.2 | 7.3 | 7.4 | 7.6 | 7.7 | 8.2
- enterprise_linux_server_eus7.6 | 7.7 | 8.1
- enterprise_linux_server_tus7.4 | 7.6 | 7.7 | 8.2
- enterprise_linux_workstation7.0
Ubuntu2 products
- grub2-signedAll versions (No fix recorded) | < 1.167~18.04.5 | < 1.167.2
- grub2-unsigned< 2.04-1ubuntu44.1.2 | < 2.04-1ubuntu44.2
Alpine1 product
- grub< 2.06-r0
Debian1 product
- grub2< 2.04-16
Fedoraproject1 product
- fedoraEOL33 | 34
Gnu1 product
- grub2< 2.06
Netapp1 product
7 vendors · 12 products
