A grub2 security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: grub2-2.06~rc1-1.fc33

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Fedora Update Notification
FEDORA-2021-5497f7409b
2021-04-10 23:05:43.632046
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Name : grub2
Product : Fedora 33
Version : 2.06~rc1
Release : 1.fc33
URL :   http://www.gnu.org/software/grub/
Summary : Bootloader with support for Linux, Multiboot and more
Description :

The GRand Unified Bootloader (GRUB) is a highly configurable and
customizable bootloader with modular architecture. It supports a rich
variety of kernel formats, file systems, computer architectures and
hardware devices.

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Update Information:

Update to 2.06~rc1 to fix a bunch of CVEs
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ChangeLog:

* Tue Apr 6 2021 Javier Martinez Canillas - 2.06~rc1-1
- Update to 2.06~rc1 to fix a bunch of CVEs
Resolves: CVE-2020-14372
Resolves: CVE-2020-25632
Resolves: CVE-2020-25647
Resolves: CVE-2020-27749
Resolves: CVE-2020-27779
Resolves: CVE-2021-20225
Resolves: CVE-2021-20233
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-5497f7409b' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys