Is CVE-2022-28735 in the CISA KEV catalog?

No. CVE-2022-28735 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-28735?

CVE-2022-28735 has a CVSS v3 base score of 6.7 (MEDIUM).

What is the EPSS score for CVE-2022-28735?

CVE-2022-28735 has an EPSS score of 0.32% (23th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-28735?

Upgrade grub2 on debian 11 to 2.06-3~deb11u1 or later. Fixes are available for 11 affected products.

CVE & CISA-KEV Catalog

CVE-2022-28735

MEDIUM

6.7

CVSS v3

NVD

Description

The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain.

How to fix

Remediation Available

grub2Debian

Fixed in:2.06-3~deb11u1CVE-2022-28735

Fixed in:2.06-3CVE-2022-28735

grub-efi-amd64Ubuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-amd64-binUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-amd64-signedUbuntu

Fixed in:1.187.3~20.04.1+2.06-2ubuntu14.1USN-6355-1

Fixed in:1.187.3~22.04.1+2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64Ubuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64-binUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

grub-efi-arm64-signedUbuntu

Fixed in:1.187.3~20.04.1+2.06-2ubuntu14.1USN-6355-1

Fixed in:1.187.3~22.04.1+2.06-2ubuntu14.1USN-6355-1

grub2-signedUbuntu

Fixed in:1.187.3~20.04.1USN-6355-1

Fixed in:1.187.3~22.04.1USN-6355-1

grub2-unsignedUbuntu

Fixed in:2.06-2ubuntu14.1USN-6355-1

shimUbuntu

Fixed in:15.7-0ubuntu1USN-6355-1

shim-signedUbuntu

Fixed in:1.40.9USN-6355-1

Fixed in:1.51.3USN-6355-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.32%probability of exploitation in 30 days

23rdpercentile

Low risk: more likely to be exploited than 23% of all known CVEs.

References

Third-Party Advisory2

Other references1

security.netapp.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.