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CVE-2023-40550

Shim: out-of-bound read in verify_buffer_sbat()

Medium5.5EPSS 0.40%
Published
Updated
Reserved
Assigned by
redhat

Description

An out-of-bounds read flaw was found in Shim when it tried to validate the SBAT information. This issue may expose sensitive data during the system's boot phase.

Timeline

  1. ID reserved

    By redhat

  2. · 6 months later

    Published

  3. · 24 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2023-40550, by who scored it
Scored byCVSSScoreVector
redhatCNA (assigner)3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
EPSS (exploitation in 30 days)
0.40% · top 66% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

Affected products

References (12)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .