CVE-2025-20005 Overview
CVE-2025-20005 is a BIOS/UEFI vulnerability affecting Intel reference platforms due to improper buffer restrictions in the UEFI firmware. This vulnerability allows a privileged local attacker to potentially escalate privileges and manipulate data on affected systems.
The vulnerability stems from CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), a memory corruption weakness that occurs when software performs operations on a memory buffer without properly restricting the operations to within the buffer's intended boundaries.
Critical Impact
A privileged local attacker exploiting this vulnerability can achieve privilege escalation and data manipulation through improper buffer handling in Intel UEFI firmware, potentially compromising system integrity.
Affected Products
- Intel UEFI firmware for Intel reference platforms
- Systems utilizing affected Intel reference platform firmware
- Vendor implementations based on vulnerable Intel reference designs
Discovery Timeline
- 2026-03-10 - CVE-2025-20005 published to NVD
- 2026-03-11 - Last updated in NVD database
Technical Details for CVE-2025-20005
Vulnerability Analysis
This vulnerability resides in the UEFI firmware layer of certain Intel reference platforms. The improper buffer restrictions create a condition where memory operations can exceed intended boundaries, enabling an attacker with elevated privileges to manipulate firmware-level data structures.
The attack requires local access to the system and a high complexity approach, meaning successful exploitation is not trivial and depends on specific environmental conditions. The attacker must already possess privileged user access before attempting to leverage this vulnerability.
From an impact perspective, the vulnerability primarily affects system integrity, potentially allowing unauthorized data modification. While confidentiality is not directly impacted, the availability of the system may experience limited degradation. The firmware-level nature of this vulnerability makes it particularly concerning, as UEFI firmware operates at a foundational layer below the operating system.
Root Cause
The root cause is improper buffer restrictions (CWE-119) within the UEFI firmware code. This weakness occurs when the firmware fails to properly validate or restrict memory operations within defined buffer boundaries. In firmware contexts, such flaws can be particularly dangerous as they operate in a highly privileged execution environment before the operating system loads.
Buffer restriction issues in UEFI firmware can arise from insufficient bounds checking when processing data structures, configuration data, or during runtime services. The firmware's trusted execution environment makes proper memory safety critical, as exploitation can bypass traditional OS-level security controls.
Attack Vector
The attack vector is local, requiring the adversary to have existing access to the target system. The attacker must possess privileged user credentials to exploit this vulnerability, limiting the attack surface to scenarios involving insider threats, compromised administrative accounts, or physical access to the system.
Given the high attack complexity rating, successful exploitation likely requires specific conditions such as particular firmware configurations, timing dependencies, or the need to chain this vulnerability with other attack techniques. The local access requirement combined with the need for privileged access significantly reduces the likelihood of opportunistic exploitation.
The exploitation mechanism involves leveraging the improper buffer restrictions to perform unauthorized memory operations that escalate privileges or manipulate critical firmware data structures. Specific technical details regarding the exact exploitation methodology should be obtained from the Intel Security Advisory SA-01234.
Detection Methods for CVE-2025-20005
Indicators of Compromise
- Unexpected modifications to UEFI firmware variables or configuration data
- Anomalous firmware update activities or runtime service calls
- System integrity check failures during boot sequence
- Unusual privileged process behavior interacting with firmware interfaces
Detection Strategies
- Monitor firmware integrity using hardware-based attestation mechanisms such as TPM measurements
- Implement UEFI Secure Boot with signature verification to detect unauthorized firmware modifications
- Deploy endpoint detection solutions capable of monitoring SMM and firmware-level operations
- Utilize system management mode (SMM) monitoring where available to detect anomalous firmware interactions
Monitoring Recommendations
- Enable firmware event logging and forward logs to centralized SIEM for analysis
- Establish baseline UEFI firmware configurations and monitor for deviations
- Implement periodic firmware integrity verification using vendor-provided tools
- Monitor for suspicious privileged process activity that interacts with firmware services
How to Mitigate CVE-2025-20005
Immediate Actions Required
- Review the Intel Security Advisory SA-01234 for affected product details and remediation guidance
- Identify systems utilizing affected Intel reference platform firmware in your environment
- Restrict privileged account access and enforce principle of least privilege
- Enable UEFI Secure Boot if not already configured to prevent unauthorized firmware modifications
Patch Information
Intel has published guidance through Intel Security Advisory SA-01234. Organizations should consult this advisory and work with their system vendors to obtain appropriate firmware updates, as Intel reference platform firmware updates are typically distributed through OEM and system manufacturer channels.
Contact your hardware vendor for specific firmware update packages applicable to your systems. Firmware updates should be tested in a controlled environment before broad deployment due to the critical nature of UEFI firmware.
Workarounds
- Implement strict access controls to limit users with privileged system access
- Enable hardware security features such as Secure Boot and TPM to provide additional firmware integrity protections
- Restrict physical access to affected systems to reduce local attack surface
- Monitor privileged account usage and implement multi-factor authentication for administrative access
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
