Is CVE-2023-40550 in the CISA KEV catalog?

No. CVE-2023-40550 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-40550?

CVE-2023-40550 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2023-40550?

CVE-2023-40550 has an EPSS score of 0.39% (31th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-40550?

Upgrade shim on debian 11 to 15.8-1~deb11u1 or later. Fixes are available for 21 affected products.

CVE & CISA-KEV Catalog

CVE-2023-40550

MEDIUM

5.5

CVSS v3

NVD

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.

CWE-125Out-of-bounds Read

How to fix

Remediation Available

shimDebian

Fixed in:15.8-1~deb11u1CVE-2023-40550

Fixed in:15.8-1~deb12u1CVE-2023-40550

Fixed in:15.8-1CVE-2023-40550

mokutilRed Hat / RHEL

Fixed in:0:15.8-1.el7RHSA-2024:1959

mokutilRocky

Fixed in:0:15.8-1.el7RHSA-2024:1959

mokutil-debuginfoRocky

Fixed in:0:15.8-1.el7RHSA-2024:1959

mokutil-debuginfoRed Hat / RHEL

Fixed in:0:15.8-1.el7RHSA-2024:1959

shimRocky

Fixed in:0:15.8-3.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

Fixed in:0:15.8-3.el9RHSA-2024:1835

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

shimRed Hat / RHEL

Fixed in:0:15.8-3.el7RHSA-2024:1959

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

Fixed in:0:15.8-3.el9RHSA-2024:1835

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

shim-aa64Rocky

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

Fixed in:0:15.8-3.el9RHSA-2024:1835

shim-aa64Red Hat / RHEL

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

Fixed in:0:15.8-3.el9RHSA-2024:1835

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

shim-ia32Red Hat / RHEL

Fixed in:0:15.8-1.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

shim-ia32Rocky

Fixed in:0:15.8-1.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-2.el8RHSA-2024:1883

shim-signedRed Hat / RHEL

Fixed in:0:15.8-1.el7RHSA-2024:1959

shim-signedRocky

Fixed in:0:15.8-1.el7RHSA-2024:1959

shim-unsigned-aarch64Rocky

Fixed in:0:15.8-2.el9RHSA-2024:1835

shim-unsigned-aarch64Red Hat / RHEL

Fixed in:0:15.8-2.el9RHSA-2024:1835

shim-unsigned-ia32Rocky

Fixed in:0:15.8-3.el7RHSA-2024:1959

shim-unsigned-ia32Red Hat / RHEL

Fixed in:0:15.8-3.el7RHSA-2024:1959

shim-unsigned-x64Rocky

Fixed in:0:15.8-3.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-2.el9RHSA-2024:1835

shim-unsigned-x64Red Hat / RHEL

Fixed in:0:15.8-3.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-2.el9RHSA-2024:1835

shim-x64Rocky

Fixed in:0:15.8-1.el7RHSA-2024:1959

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

Fixed in:0:15.8-3.el9RHSA-2024:1835

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

shim-x64Red Hat / RHEL

Fixed in:0:15.8-1.el7RHSA-2024:1959

Fixed in:0:15.8-4.el8_9RHSA-2024:1902

Fixed in:0:15.8-2.el8_4RHSA-2024:1873

Fixed in:0:15.8-2.el8_6RHSA-2024:2086

Fixed in:0:15.8-2.el8_2RHSA-2024:1834

Fixed in:0:15.8-2.el8RHSA-2024:1883

Fixed in:0:15.8-3.el9RHSA-2024:1835

Fixed in:0:15.8-3.el9_2RHSA-2024:1876

Fixed in:0:15.8-4.el9_3RHSA-2024:1903

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.39%probability of exploitation in 30 days

31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Vendor Advisory2

Other references10

Related Vulnerabilities

Other CWE-125 (Out-of-bounds Read) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2014-0160	High	7.5	100%	KEV	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2021-4034	High	7.8	95%	KEV	Fix
CVE-2023-21769	High	7.5	92%	-	Fix
CVE-2023-49285	High	8.6	89%	-	Fix
CVE-2020-8794	Critical	9.8	89%	-	Fix

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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.