CVE-2020-27779
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
02 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
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 0.39% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 32.8% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2021-03-03 16:40Z5 YR AGO
- Last updated
- 2024-08-04 16:25Z2 YR AGO
- Reserved
- 2020-10-27
- Assigning CNA
- redhat
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- CWE-285Improper AuthorizationClass
- Data version
- 5.1
- Document digest
- 7f8284fa56b6a40c02741bc37a0e6b558531e6c016fac67c8e694e6da9fc8eba
05 Affected products
06 References
- bugzilla.redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=1900698
- lists.fedoraproject.orgFEDORA-2021-cab258a413https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
- security.gentoo.orgGLSA-202104-05https://security.gentoo.org/glsa/202104-05
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20220325-0001/
07 Fixed in
AlmaLinux 8
- shim-aa64 Fixed in 15.4-2.el8_1.alma
- shim-ia32 Fixed in 15.4-2.el8_1.alma
- shim-unsigned-aarch64 Fixed in 15-7.el8_1.alma
- shim-unsigned-x64 Fixed in 15.4-4.el8_1.alma
- shim-x64 Fixed in 15.4-2.el8_1.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- grub Fixed in 2:2.06-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- shim-aa64 Fixed in 15.4-2.el8_1.alma
- shim-ia32 Fixed in 15.4-2.el8_1.alma
- shim-unsigned-aarch64 Fixed in 15-7.el8_1.alma
- shim-unsigned-x64 Fixed in 15.4-4.el8_1.alma
- shim-x64 Fixed in 15.4-2.el8_1.alma
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- grub2 Fixed in 2.04-16
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- grub2 Fixed in 2.04-16
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- grub2 Fixed in 2.04-16
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- grub2-signed Fixed in 1.167~18.04.5
- grub2-unsigned Fixed in 2.04-1ubuntu44.1.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- grub2-signed Fixed in 1.167.2
- grub2-unsigned Fixed in 2.04-1ubuntu44.2
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- grub2-signed No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.