CVE-2026-20737

Executive Summary

CVE-2026-20737 is an unpatched, locally exploitable information-disclosure vulnerability (CWE-200) in Intel(R) PROSet/Wireless WiFi Software for Windows, residing in Ring 2 device-driver code. An unprivileged, unauthenticated local user can trigger the flaw with low complexity and no user interaction, leading to exposure of sensitive information that enables escalation of privilege and local code execution. No public exploit code or in-the-wild exploitation has been reported, and no vendor patch exists at the time of writing.

Technical Analysis

The NVD description characterizes the flaw as an "exposure of sensitive information to an unauthorized actor" occurring within "Ring 2: Device Drivers" of Intel PROSet/Wireless WiFi Software for Windows. The Ring 2 designation places the vulnerable code in the privileged device-driver layer of the product, which executes with elevated processor and operating-system access relative to user-mode applications. A weakness in this layer provides a direct path to kernel memory, privileged objects, and security-sensitive state.

Mechanism: The vulnerable driver fails to enforce an authorization boundary when servicing requests from unprivileged local processes. A user-mode process can interact with the driver through the standard Windows device-driver interface — for example, by opening a handle to the driver's device object and issuing device I/O control (IOCTL) requests. The driver does not adequately validate the caller's privilege level or sanitize the request, causing sensitive data to be returned to the caller. Because the flaw is in driver code, the disclosed material may include kernel memory contents, object handles, token data, or other security-relevant information. The description states that "attack requirements are not present without special internal knowledge," indicating the attacker does not need prior credentials, undocumented knowledge, or advanced preparation to reach the vulnerable code path. "Requires no user interaction" confirms the attack can be executed by a fully automated process running in the attacker's unprivileged user context.

The reported CVSS-style subscores describe a two-phase impact. The direct component impact is limited: confidentiality low, integrity none, availability none — consistent with a read-only information leak in the driver. However, the "subsequent system" scores (confidentiality high, integrity low, availability low) reflect the downstream escalation chain: the leaked information enables privilege elevation, upon which the adversary gains read access to the entire host, limited ability to modify system state or data, and limited ability to disrupt availability.

Attack surface: The product is a Wi-Fi driver stack preinstalled on a very large installed base of Intel-based Windows laptops and desktops. Any host with an Intel wireless adapter and the PROSet/Wireless software is potentially in scope. The attacker requires only local access — no network position, no high-privilege credentials, and no victim interaction. This makes the vulnerability relevant to multi-user environments, shared workstations, kiosks, VDI session hosts, and any enterprise endpoint where an unprivileged local foothold can be obtained.

Escalation chain: The flaw maps to a classic "information disclosure → privilege escalation" pattern in which leaked privileged data enables an attacker to bypass kernel-level access controls. The NVD description explicitly links the exposure to "escalation of privilege" and "local code execution." Code-level detail about the specific driver routine, IOCTL code, vulnerable buffer, or exact type of leaked data is not publicly documented. For analysis and detection purposes, this is a driver-level access-control failure (CWE-200 combined with an underlying authorization weakness) reachable only from the local host.

Exploitation Scenarios

No public PoC or exploit code exists for CVE-2026-20737 at the time of writing. The attack chain below is inferred strictly from the vulnerability class and the NVD description.

1. Reconnaissance / target identification: The adversary identifies Windows hosts with Intel wireless adapters — for example, by enumerating installed network adapters and driver packages, or by checking installed software inventory for Intel PROSet/Wireless. On a multi-user corporate laptop, kiosk, or shared VDI session, the attacker requires only an unprivileged local account or code execution in an unprivileged context (e.g., via a compromised low-privilege service or a malicious document).

2. Triggering the flaw: The attacker's unprivileged process opens a handle to the affected Intel WiFi driver's device object and submits a request (e.g., an unexpected or malformed I/O control request). The driver fails to validate the caller's authorization or fails to restrict which data is returned, causing it to expose sensitive information back to the caller. Because no user interaction is required, this step can be performed by a single automated binary or script running entirely in user mode.

3. Payload / execution method: The attacker uses the disclosed information to defeat kernel-level protections. Possible uses, based on the vulnerability class, include resolving kernel-mode memory addresses, leaking a token or privileged object handle, or obtaining data needed to corrupt system objects. The NVD description confirms the end state is "local code execution" in a privileged context. The exact payload mechanics are not specified in public documentation and should not be assumed.

4. Post-exploitation: With elevated privileges, the adversary gains high-impact confidentiality access to the system — files, credentials, registry data, and other users' data. There is low integrity impact (ability to modify some system state or data) and low availability impact (ability to cause disruption). From this position, the attacker can harvest credentials, install persistence, pivot laterally, or exfiltrate data. Given that the CVE is not in the CISA KEV catalog and no wild exploitation has been observed, this chain is currently theoretical but technically sound based on the disclosed impact trajectory.

Impact Assessment

Business impact: The primary concern is local privilege escalation on any Windows endpoint with an Intel wireless adapter — an extremely large segment of corporate laptops and desktops. The vulnerability converts minimal local access (an unprivileged user) into privileged code execution without any user interaction, which undermines endpoint security controls, EDR agent integrity, and data confidentiality.

Affected systems: Intel(R) PROSet/Wireless WiFi Software for Windows is the affected product; Intel has not yet disclosed a specific affected version range. Hosts without the Intel wireless driver stack are not affected. The threat model is strictly local: internet-facing exposure is negligible, but shared environments (VDI, RDS, labs, kiosks, contractor workstations) increase exposure because multiple unprivileged users or untrusted code can reach the local driver interface.

Blast radius: The initial component impact is limited (confidentiality low, integrity none, availability none), but successful chaining raises system-wide confidentiality to high and introduces low integrity and availability damage. A successful exploit yields code execution at a privilege level sufficient to bypass user-mode security products. However, actual exploitation requires the information leak to be successfully chained into an escalation primitive, and the EPSS score is 0.00134 (3.4th percentile of exploited CVEs), indicating a low current threat probability. The absence of any patch (confidence 0/4) means risk persists until Intel publishes a fix, and the risk profile will rise if the CVE is later added to CISA KEV or if exploit code becomes public.

Known campaigns: None. CVE-2026-20737 is not listed in the CISA Known Exploited Vulnerabilities catalog, no threat-actor campaigns have been attributed, and no exploit-in-the-wild evidence exists at publication time.

Detection Guidance

The following rules target observable behaviors rather than the vulnerability's internal mechanics, because the vulnerable routine and IOCTL details are not public. Detection focuses on (a) driver installation and load events for Intel PROSet wireless components, (b) unusual service creation or driver file modification, and (c) process activity consistent with local privilege escalation following driver interaction. Validate all rules against your environment's telemetry before deployment.

Sigma Rule

title: Suspicious Intel PROSet Wireless Driver Service Installation
id: 8f6d2c1a-3c4b-4e6f-9a7b-2d2d3f4a5b6c
status: experimental
description: Detects installation or modification of a driver service related to Intel PROSet/Wireless WiFi on Windows hosts, which may indicate an attempt to load an unpatched or malicious driver component (CVE-2026-20737).
logsource:
  product: windows
  service: system
detection:
  selection_new_service:
    EventID: 7045
    ServiceName|contains:
      - 'Intel'
      - 'PROSet'
      - 'Wireless'
      - 'WiFi'
    ImagePath|contains: '.sys'
  selection_service_control:
    EventID: 4697
    ServiceName|contains:
      - 'Intel'
      - 'PROSet'
      - 'Wireless'
      - 'WiFi'
  condition: selection_new_service or selection_service_control
falsepositives:
  - Legitimate Intel driver updates via Windows Update or Intel Driver & Support Assistant
level: medium

YARA Rule

rule CVE_2026_20737_Intel_ProSet_Driver_Hunt
{
    meta:
        author = "Valters IT Threat Intelligence"
        description = "Hunt for binaries referencing Intel PROSet/Wireless WiFi driver components; flag suspicious copies outside trusted driver paths or bundled with exploit tooling."
        cve = "CVE-2026-20737"
        date = "2026-01-01"
    strings:
        $a = "Intel" ascii wide
        $b = "PROSet" ascii wide
        $c = "Wireless" ascii wide
        $d = "WiFi" ascii wide
        $e = ".sys" ascii wide
    condition:
        3 of ($a,$b,$c,$d) and $e
}

Suricata IDS Rule

Note: CVE-2026-20737 is locally exploitable; network detection cannot observe the trigger. This rule detects post-exploitation behavior — an HTTP download of driver-named payloads, or data exfiltration from a host with the vulnerable driver.

alert http any any -> any any (msg:"CVE-2026-20737 Potential Payload Download Referencing Intel PROSet Driver"; flow:established,to_server; http.uri; content:"Intel"; nocase; content:"PROSet"; distance:0; nocase; content:"Wireless"; distance:0; nocase; content:".exe"; http.uri; classtype:attempted-user; sid:620737001; rev:1;)

Elastic Detection

// Detect driver file creation outside the standard driver repository or with suspicious naming on hosts running Intel wireless hardware
file where event.action in ("creation", "modification") and file.extension == "sys" and file.path : "*\\Drivers\\*" and (file.name : "*Intel*" or file.name : "*PROSet*" or file.name : "*Wireless*") and not process.executable : ("C:\\Windows\\System32\\*.exe", "C:\\Windows\\SysWOW64\\*.exe")

Splunk SPL Query

index=windows EventCode=7045 OR EventCode=4697
| search ServiceName=*Intel* OR ServiceName=*PROSet* OR ServiceName=*Wireless* OR ServiceName=*WiFi* OR ImagePath=*.sys*
| eval threat="CVE-2026-20737 - Intel WiFi driver service activity"
| table _time, host, ServiceName, ImagePath, Account_Name
| sort - _time

Additional hunt for post-exploitation privilege escalation:

index=windows EventCode=4672 OR EventCode=4688
| search (Account_Name!="*$" AND New_Process_Name!=C:\\Windows\\System32\\*) OR (CommandLine=*whoami* OR CommandLine=*systeminfo*)
| table _time, host, Account_Name, New_Process_Name, CommandLine

Wazuh OSSEC Rule

<group name="windows, privesc, intel,">
  <rule id="620737" level="12">
    <if_sid>600</if_sid>
    <field name="win.event_id">^7045$|^4697$</field>
    <match>Intel|PROSet|Wireless|WiFi</match>
    <description>CVE-2026-20737: Possible Intel PROSet/Wireless WiFi driver service installation or modification</description>
    <group>local_privesc,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence is 0/4 — no patch evidence from any tracked source. Intel has not published a fixed version or a vendor advisory at the time of this report. Guidance below is prioritized around risk reduction until an official fix is available.

1. Immediate mitigations:

• Restrict local access: enforce least-privilege user accounts; disable local logon for shared or unmanaged accounts on endpoints with Intel wireless adapters.
• Harden multi-user hosts: for VDI/RDS/kiosk fleets, reduce unprivileged code-execution opportunities using AppLocker or Windows Defender Application Control (WDAC) policies to prevent an attacker from reaching the driver interface.
• Monitor driver installations (Event IDs 7045/4697, plus Sysmon driver-load events) on endpoints running Intel PROSet/Wireless WiFi Software; escalate any unsigned or anomalous driver loads for review.
• If the Intel wireless adapter is not business-required, consider disabling the adapter or removing the PROSet/Wireless software until the patch is available.

2. Patch/upgrade steps:

• Subscribe to Intel's security advisory feed and apply the vendor update for CVE-2026-20737 as soon as it is released.
• Until a patch exists, track affected driver versions manually and treat the software as temporarily unsupported from a security standpoint; do not install driver packages from untrusted sources.
• Re-check the CISA KEV catalog and Intel advisory pages on a regular cadence; if the CVE is added to KEV, treat remediation as emergency and escalate patching accordingly.

3. Long-term hardening:

• Replace manually-installed Intel WiFi driver packages with enterprise-managed driver baselines distributed via Windows Update or your endpoint management tool, reducing the chance of stale or unpatched driver versions.
• Deploy WDAC or driver block rules that only allow known-good, signed Intel driver binaries to load.
• Enforce kernel-level exploit mitigations such as Credential Guard, virtualization-based security, and memory-integrity features to raise the cost of chaining information disclosure into code execution.
• Maintain a local privilege-escalation hunting workflow: correlate new service/driver events with subsequent anomalous process behavior and EDR alerts on a weekly basis.

References

1. NVD Entry — CVE-2026-20737: https://nvd.nist.gov/vuln/detail/CVE-2026-20737
2. CWE-200 — Exposure of Sensitive Information to an Unauthorized Actor: https://cwe.mitre.org/data/definitions/200.html
3. FIRST EPSS — CVE-2026-20737 score (0.00134, 3.4th percentile): https://www.first.org/epss/
4. Intel Security Center (vendor advisories — no advisory for this CVE published at time of writing): https://www.intel.com/content/www/us/en/security-center/default.html
5. CISA Known Exploited Vulnerabilities Catalog (CVE-2026-20737 NOT listed): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Threat actor / in-the-wild evidence: None identified. CVE-2026-20737 is not present in the CISA KEV catalog, no exploit code or Nuclei template exists, and no campaign has been attributed to this CVE at publication time.