Buffer overflow in Gnu Grub2
CVE-2021-20233
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…
Vulnerability class: Buffer Overflow
EPSS: 0.006 (45.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Gnu Grub2
- Netapp Ontap_select_deploy_administration_utility
- Fedoraproject Fedora — versions 33, 34
- Redhat Enterprise_linux — versions 7.0, 8.0
- Redhat Enterprise_linux_server_aus — versions 7.2, 7.3, 7.4
- Redhat Enterprise_linux_server_eus — versions 7.6, 7.7, 8.1
- Redhat Enterprise_linux_server_tus — versions 7.4, 7.6, 7.7
- Redhat Enterprise_linux_workstation — versions 7.0
- N/a Grub2 — versions grub 2.06
Weakness classification (CWE)
Public proof-of-concept exploits
References
- secalert@redhat.com (Patch, Third Party Advisory, x_refsource_MISC, Issue Tracking)
- secalert@redhat.com (x_refsource_FEDORA, vendor-advisory)
- secalert@redhat.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)
- secalert@redhat.com (x_refsource_CONFIRM, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-20233?
- CVE-2021-20233 is a high-severity vulnerability in Gnu Grub2, classified under Out-of-bounds Write. CVSS score: 8.2/10. Published 2021-03-03.
- How severe is CVE-2021-20233?
- High severity. CVSS v3 base score is 8.2 out of 10.
- Is CVE-2021-20233 known to be exploited?
- 36 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.