rhboot shim shim.c verify_buffer_authenticode out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic has been found in rhboot shim. The impacted element is the function verify_buffer_authenticode of the file shim.c. This manipulation causes out-of-bounds. The identification of this vulnerability is CVE-2023-40549. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in rhboot shim (version now known). Affected by this vulnerability is the function verify_buffer_authenticode of the file shim.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality.

The weakness was shared 01/24/2024. The advisory is shared at bugzilla.redhat.com. This vulnerability is known as CVE-2023-40549 since 08/15/2023. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 215357 (Azure Linux 3.0 Security Update: shim / shim-unsigned-aarch64 / shim-unsigned-x64 (CVE-2023-40549)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (215357) and EUVD (EUVD-2023-45120). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.1
VulDB Meta Temp Score: 5.1

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CNA Base Score: 6.2
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 215357
Nessus Name: Azure Linux 3.0 Security Update: shim / shim-unsigned-aarch64 / shim-unsigned-x64 (CVE-2023-40549)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

08/15/2023 🔍
01/24/2024 +162 days 🔍
01/24/2024 +0 days 🔍
10/01/2025 +616 days 🔍

Sourcesinfo

Advisory: bugzilla.redhat.com
Status: Not defined

CVE: CVE-2023-40549 (🔍)
GCVE (CVE): GCVE-0-2023-40549
GCVE (VulDB): GCVE-100-251929
EUVD: 🔍

Entryinfo

Created: 01/24/2024 09:45
Updated: 10/01/2025 12:37
Changes: 01/24/2024 09:45 (37), 02/17/2024 18:27 (1), 02/17/2024 18:36 (21), 06/11/2024 06:12 (15), 02/11/2025 04:11 (3), 10/01/2025 12:37 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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