CVE-2021-20233

2021-03-0316:44:34

CWE-787

redhat

www.cve.org

grub2

memory corruption

length calculation

data confidentiality

data integrity

system availability

AI Score

8.3

Confidence

High

EPSS

Percentile

5.1%

JSON

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.

CNA Affected

[
  {
    "product": "grub2",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "grub 2.06"
      }
    ]
  }
]