VDB-295633 · CVE-2023-43758 · intel-sa-01139

Intel Processors UEFI Firmware input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in Intel Processors. This affects an unknown function of the component UEFI Firmware. This manipulation causes input validation. This vulnerability appears as CVE-2023-43758. The attack requires local access. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Intel Processors (affected version not known). Affected by this vulnerability is some unknown functionality of the component UEFI Firmware. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

Improper input validation in UEFI firmware for some Intel(R) processors may allow a privileged user to potentially enable escalation of privilege via local access.

The advisory is shared at intel.com. This vulnerability is known as CVE-2023-43758 since 10/25/2023. The exploitation appears to be easy. An attack has to be approached locally. Additional levels of successful authentication are necessary for exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/01/2026).

The vulnerability scanner Nessus provides a plugin with the ID 216356 (Fedora 41 : microcode_ctl (2025-c99f9d789a)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (216356) and CERT Bund (WID-SEC-2025-0323). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

Debian Linux
Amazon Linux 2
Red Hat Enterprise Linux
Fedora Linux
Ubuntu Linux
HPE Synergy
Lenovo Computer
Fujitsu BIOS
HPE ProLiant
RESF Rocky Linux
HP BIOS
Lenovo BIOS
Dell PowerScale
Dell Computer
Dell PowerEdge
Intel Firmware

Productinfo

Vendor

Intel

Name

Processors

License

commercial

Website

Vendor: https://www.intel.com/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 6.7
VulDB Temp Score: 6.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (intel): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 216356
Nessus Name: Fedora 41 : microcode_ctl (2025-c99f9d789a)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/25/2023 🔍
02/12/2025 +476 days 🔍
02/12/2025 +0 days 🔍
05/01/2026 +443 days 🔍

Sourcesinfo

Vendor: intel.com

Advisory: intel-sa-01139
Status: Confirmed

CVE: CVE-2023-43758 (🔍)
GCVE (CVE): GCVE-0-2023-43758
GCVE (VulDB): GCVE-100-295633
CERT Bund: WID-SEC-2025-0323 - Intel Firmware: Mehrere Schwachstellen

Entryinfo

Created: 02/12/2025 23:24
Updated: 05/01/2026 10:01
Changes: 02/12/2025 23:24 (73), 02/16/2025 13:03 (2), 10/14/2025 11:40 (7), 05/01/2026 09:58 (1), 05/01/2026 10:01 (4)
Complete: 🔍
Committer: lywand
Cache ID: 216::103

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