Vulnerability-Lookup

CVE-2021-20233 (GCVE-0-2021-20233)

Vulnerability from cvelistv5 – Published: 2021-03-03 16:44 – Updated: 2024-08-03 17:37

Summary

A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity

8.2 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

CWE

CWE-787

Assigner

redhat CNA under the redhat root

CNA scorecard B 82/100 over 1045 records in the last 180 days details

References

4 references

URL	Tags
https://bugzilla.redhat.com/show_bug.cgi?id=1926263	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://security.gentoo.org/glsa/202104-05	vendor-advisoryx_refsource_GENTOO
https://security.netapp.com/advisory/ntap-2022032…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
n/a	grub2	Affected: grub 2.06

Show details on NVD website

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MSRC_CVE-2021-20233

Vulnerability from csaf_microsoft - Published: 2021-03-02 00:00 - Updated: 2026-02-26 01:01

Summary

A flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Scope

1 vulnerability in this advisory, including CVE-2021-20233.

CVE-2021-20233

8.2 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Fixed: 2 products Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OESA-2021-1095 (CVE-2020-25632)

Vulnerability from osv_openeuler – Published: 2021-03-26 11:04 – Updated: 2026-08-06 11:04 – Source website

Summary

grub2 security update

Details

GNU GRUB is a Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn. Briefly, a boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the operating system kernel software (such as the Hurd or Linux). The kernel, in turn, initializes the rest of the operating system (e.g. GNU).

Security Fix(es):

A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25632)

A flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25647)

A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27749)

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.(CVE-2021-20225)

A flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.(CVE-2020-14372)

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.(CVE-2020-27779)

Severity

7.6 (High)


                    
                      CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References

URL

Type

	https://openeuler.org/en/security/safety-bulletin…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-25632	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-25647	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-27749	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-20225	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-20233	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-14372	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-27779	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "grub2-debuginfo-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-cdboot-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-2.04-13.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-13.oe1.aarch64.rpm",
          "grub2-debuginfo-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-cdboot-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-13.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.aarch64.rpm"
        ],
        "noarch": [
          "grub2-efi-aa64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-13.oe1.noarch.rpm",
          "grub2-efi-x64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-help-2.04-13.oe1.noarch.rpm",
          "grub2-common-2.04-13.oe1.noarch.rpm",
          "grub2-efi-ia32-modules-2.04-13.oe1.noarch.rpm",
          "grub2-efi-ia32-modules-2.04-13.oe1.noarch.rpm",
          "grub2-help-2.04-13.oe1.noarch.rpm",
          "grub2-efi-aa64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-common-2.04-13.oe1.noarch.rpm",
          "grub2-efi-x64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-13.oe1.noarch.rpm"
        ],
        "src": [
          "grub2-2.04-13.oe1.src.rpm",
          "grub2-2.04-13.oe1.src.rpm"
        ],
        "x86_64": [
          "grub2-pc-2.04-13.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-13.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-extra-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-pc-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-13.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-2.04-13.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-extra-2.04-13.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS",
        "name": "grub2",
        "purl": "pkg:rpm/openEuler/grub2\u0026distro=openEuler-20.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-13.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "grub2-debuginfo-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-2.04-13.oe1.aarch64.rpm",
          "grub2-efi-aa64-cdboot-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-extra-2.04-13.oe1.aarch64.rpm",
          "grub2-debugsource-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-2.04-13.oe1.aarch64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.aarch64.rpm"
        ],
        "noarch": [
          "grub2-efi-ia32-modules-2.04-13.oe1.noarch.rpm",
          "grub2-help-2.04-13.oe1.noarch.rpm",
          "grub2-efi-aa64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-common-2.04-13.oe1.noarch.rpm",
          "grub2-efi-x64-modules-2.04-13.oe1.noarch.rpm",
          "grub2-pc-modules-2.04-13.oe1.noarch.rpm"
        ],
        "src": [
          "grub2-2.04-13.oe1.src.rpm"
        ],
        "x86_64": [
          "grub2-pc-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-efi-2.04-13.oe1.x86_64.rpm",
          "grub2-debuginfo-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-x64-2.04-13.oe1.x86_64.rpm",
          "grub2-debugsource-2.04-13.oe1.x86_64.rpm",
          "grub2-efi-ia32-cdboot-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-minimal-2.04-13.oe1.x86_64.rpm",
          "grub2-tools-extra-2.04-13.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "grub2",
        "purl": "pkg:rpm/openEuler/grub2\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-13.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "High"
  },
  "details": "GNU GRUB is a Multiboot boot loader. It was derived from GRUB, the GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn. Briefly, a boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the operating system kernel software (such as the Hurd or Linux). The kernel, in turn, initializes the rest of the operating system (e.g. GNU).\r\n\r\nSecurity Fix(es):\r\n\r\nA flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25632)\r\n\r\nA flaw was found in grub2 in versions prior to 2.06. During USB device initialization, descriptors are read with very little bounds checking and assumes the USB device is providing sane values. If properly exploited, an attacker could trigger memory corruption leading to arbitrary code execution allowing a bypass of the Secure Boot mechanism. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-25647)\r\n\r\nA flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27749)\r\n\r\nA 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.(CVE-2021-20225)\r\n\r\nA flaw was found in grub2 in versions prior to 2.06. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2021-20233)\n\nA flaw was found in grub2 in versions prior to 2.06, where it incorrectly enables the usage of the ACPI command when Secure Boot is enabled. This flaw allows an attacker with privileged access to craft a Secondary System Description Table (SSDT) containing code to overwrite the Linux kernel lockdown variable content directly into memory. The table is further loaded and executed by the kernel, defeating its Secure Boot lockdown and allowing the attacker to load unsigned code. The highest threat from this vulnerability is to data confidentiality and integrity, as well as system availability.(CVE-2020-14372)\n\nA 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\u0027s memory layout. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.(CVE-2020-27779)",
  "id": "OESA-2021-1095",
  "modified": "2026-08-06T11:04:19Z",
  "published": "2021-03-26T11:04:19Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2021-1095"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25632"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-25647"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27749"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20225"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-20233"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-14372"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-27779"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "grub2 security update",
  "upstream": [
    "CVE-2020-25632",
    "CVE-2020-25647",
    "CVE-2020-27749",
    "CVE-2021-20225",
    "CVE-2021-20233",
    "CVE-2020-14372",
    "CVE-2020-27779"
  ]
}

OPENSUSE-SU-2021:0462-1

Vulnerability from csaf_opensuse - Published: 2021-03-22 11:05 - Updated: 2026-09-20 19:22

Summary

Security update for grub2

Severity

Important

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Recommended: 14 products

Open the full advisory

OPENSUSE-SU-2024:10824-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2026-09-20 20:06

Summary

grub2-2.06-7.1 on GA media

Severity

Moderate

Scope

11 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Recommended: 36 products

Open the full advisory

RHSA-2021:0696

Vulnerability from csaf_opensuse - Published: 2021-03-02 00:00 - Updated: 2026-09-20 11:13

Summary

security update for grub2

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Recommended: 13 products

Open the full advisory

RHSA-2021:0699

Vulnerability from csaf_opensuse - Published: 2021-03-02 00:00 - Updated: 2026-09-20 11:13

Summary

security update for grub2

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Recommended: 13 products

Open the full advisory

RHSA-2021:0697

Vulnerability from csaf_redhat - Published: 2021-03-02 19:28 - Updated: 2026-06-26 22:26

Summary

Red Hat Security Advisory: grub2 security update

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

A flaw was found in grub2. Setparam_prefix() in the menu rendering code performs a length calculation on the assumption that expressing a quoted single quote will require 3 characters, while it actually requires 4 characters which allows an attacker to corrupt memory by one byte for each quote in the input. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Fixed: 41 products

https://access.redhat.com/errata/RHSA-2021:0697

Open the full advisory

RHSA-2021:0698

Vulnerability from csaf_redhat - Published: 2021-03-02 19:19 - Updated: 2026-06-26 22:26

Summary

Red Hat Security Advisory: grub2 security update

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Fixed: 41 products

https://access.redhat.com/errata/RHSA-2021:0698

Open the full advisory

RHSA-2021:0700

Vulnerability from csaf_redhat - Published: 2021-03-02 21:02 - Updated: 2026-06-26 22:26

Summary

Red Hat Security Advisory: grub2 security update

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Fixed: 57 products

https://access.redhat.com/errata/RHSA-2021:0700

Open the full advisory

RHSA-2021:0701

Vulnerability from csaf_redhat - Published: 2021-03-02 21:13 - Updated: 2026-06-26 22:26

Summary

Red Hat Security Advisory: grub2 security update

Severity

Moderate

Scope

7 vulnerabilities in this advisory, including CVE-2021-20233.

CVE-2021-20233

7.5 (High)


                
                  CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Fixed: 72 products

https://access.redhat.com/errata/RHSA-2021:0701

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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CVE-2021-20233 (GCVE-0-2021-20233)

OESA-2021-1095 (CVE-2020-25632)

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