A shim-unsigned security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: shim-unsigned-x64-15.4-5.fc33

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Fedora Update Notification
FEDORA-2021-f6c91e2b75
2021-04-29 00:56:23.403060
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Name : shim-unsigned-x64
Product : Fedora 33
Version : 15.4
Release : 5.fc33
URL :   https://github.com/rhboot/shim
Summary : First-stage UEFI bootloader
Description :

Initial UEFI bootloader that handles chaining to a trusted full
bootloader under secure boot environments.

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Update Information:

Update to shim 15.4
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ChangeLog:

* Wed Apr 14 2021 Peter Jones - 15.4-5
- Fix the package version in the sbat data.
* Mon Apr 12 2021 Peter Jones - 15.4-4
- Fix mok variable storage allocation region
Resolves: rhbz#1948432
* Sat Apr 10 2021 Peter Jones - 15.4-3
- Fix handling of ignore_db and user_insecure_mode
- Fix booting on pre-UEFI Macs
* Wed Mar 31 2021 Peter Jones - 15.4-2
- Fix the ia32 build.
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
* Tue Mar 30 2021 Peter Jones - 15.4-1
- Update to shim 15.4
- Support for revocations via the ".sbat" section and SBAT EFI variable
- A new unit test framework and a bunch of unit tests
- No external gnu-efi dependency
- Better CI
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
* Wed Mar 24 2021 Peter Jones - 15.3-0~1
- Update to shim 15.3
- Support for revocations via the ".sbat" section and SBAT EFI variable
- A new unit test framework and a bunch of unit tests
- No external gnu-efi dependency
- Better CI
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-f6c91e2b75' 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