CVE-2020-27779: fedoraproject fedora Improper Authorization
Vulnerability summary
CVE-2020-27779 is a high (CVSS 7.5) Improper Authorization vulnerability in fedoraproject fedora. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 31.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 25 · Related 10Timeline
- 03-03-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
A flaw was found in grub2 in versions prior to 2.06. The cutmem command does not honor secure boot locking allowing an privileged attacker to remove address ranges from memory creating an opportunity to circumvent SecureBoot protections after proper triage about grub's memory layout. 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 · AlpineEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS trend
Probability
0.39%
Chance of exploitation in the next 30 days
Percentile
32%
Versus all other CVEs
30-day change
0.00 pp
From 0.39% 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
