7.8

CVE-2022-28735: gnu project gnu grub

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2022-28735DEBIAN-CVE-2022-28735
Published 20-07-2023Last modified 13-02-2025
Open JSON

Vulnerability summary

CVE-2022-28735 is a high (CVSS 7.8) vulnerability in gnu project gnu grub. EPSS estimates a 0.31% chance of exploitation in the next 30 days, higher than 22.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.31%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 11 · Related 6
OPENSUSE-SU-2024:12137-1RHSA-2022:5095RHSA-2022:5096RHSA-2022:5098RHSA-2022:5099RHSA-2022:5100

Timeline

  1. 20-07-2023
    PublishedVulnerability first disclosed.
  2. 13-02-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.31%

Chance of exploitation in the next 30 days

Percentile

23%

Versus all other CVEs

30-day change

0.00 pp

From 0.31% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu2 products
  • grub2-signedAll versions (No fix recorded) | < 1.187.3~18.04.1 | < 1.187.3~20.04.1 | < 1.187.3~22.04.1
  • grub2-unsignedAll versions (No fix recorded) | < 2.06-2ubuntu14.1
Debian1 product
  • grub2< 2.06-3
Gnu1 product
Gnu project1 product

4 vendors · 5 products

References

8 links