CVE-2025-58715 Overview
CVE-2025-58715 is an integer overflow vulnerability [CWE-190] in the Microsoft Windows Speech component. The flaw allows an authorized local attacker to elevate privileges on affected systems. Microsoft assigned this vulnerability a CVSS 3.1 base score of 8.8, reflecting a scope-changing impact on confidentiality, integrity, and availability.
The issue affects a broad range of Windows client and server releases, including Windows 10, Windows 11, and Windows Server editions from 2016 through 2025. Microsoft released updates addressing the flaw through its October 2025 security guidance.
Critical Impact
A low-privileged local user can trigger an integer overflow in the Windows Speech component to gain elevated privileges with a scope change, potentially compromising the entire host.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (versions 22H2, 23H2, 24H2, 25H2)
- Microsoft Windows Server 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-10-14 - CVE-2025-58715 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-58715
Vulnerability Analysis
The vulnerability resides in the Windows Speech component and stems from an integer overflow or wraparound condition. When the affected code performs arithmetic on attacker-influenced values without adequate bounds validation, the resulting wraparound produces an undersized allocation or an incorrect length calculation. Subsequent memory operations use the miscalculated value, leading to memory corruption in a higher-privileged context.
Successful exploitation results in a scope change, meaning the impact extends beyond the security authority that initially controls the vulnerable code. An attacker who succeeds can gain SYSTEM-level privileges from a low-privileged user session, undermining local security boundaries.
Root Cause
The root cause is an integer overflow or wraparound weakness [CWE-190] in a Windows Speech code path. Arithmetic on untrusted input exceeds the storage capacity of the integer type, wraps to a small value, and drives an unsafe allocation or copy operation. This class of defect commonly leads to heap corruption when the wrapped value is used as a buffer size.
Attack Vector
Exploitation requires local access and low privileges. No user interaction is needed. The attacker must run code on the target host, then interact with the affected Speech interface or service to trigger the overflow. Because the scope is changed, a successful attack transitions from user-mode privileges to a higher trust boundary on the same system.
No public proof-of-concept exploit is currently available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog. Refer to the Microsoft Security Update for CVE-2025-58715 for authoritative technical details.
Detection Methods for CVE-2025-58715
Indicators of Compromise
- Unexpected crashes, access violations, or Windows Error Reporting entries referencing Windows Speech binaries or associated service processes.
- New child processes spawned from Speech-related services running with elevated integrity levels.
- Creation of new local administrator accounts or scheduled tasks shortly after Speech component activity on the host.
Detection Strategies
- Baseline normal Speech component behavior and alert on anomalous process creation, token manipulation, or module loads originating from Speech binaries.
- Correlate local logon events with subsequent privilege elevations to surface potential exploitation attempts.
- Track Windows patch state across the fleet and alert on hosts missing the October 2025 security update that resolves this issue.
Monitoring Recommendations
- Enable process creation auditing (Event ID 4688) with command-line logging and forward events to a centralized analytics platform.
- Monitor Sysmon Event IDs 1 (process creation), 10 (process access), and 11 (file creation) for activity involving Speech component paths.
- Review Windows Error Reporting and application crash telemetry for repeated faults tied to Speech-related modules, which may indicate exploitation attempts.
How to Mitigate CVE-2025-58715
Immediate Actions Required
- Apply the Microsoft security updates released through the MSRC advisory for CVE-2025-58715 to all affected Windows 10, Windows 11, and Windows Server systems.
- Prioritize patching multi-user hosts, jump servers, and systems accessible to low-privileged users where local elevation attacks are most impactful.
- Audit local accounts and remove unnecessary interactive logon rights to reduce the population of users capable of triggering the flaw.
Patch Information
Microsoft addressed CVE-2025-58715 in its October 2025 security updates. Administrators should install the cumulative update corresponding to each affected Windows build. Consult the Microsoft Security Update Guide for the specific KB articles and package identifiers per operating system version.
Workarounds
- No official workaround has been published by Microsoft; applying the security update is the supported remediation.
- Where patching must be delayed, restrict local logon rights and enforce application allowlisting to limit which users can execute code that interacts with the Speech component.
- Disable or restrict Speech-related services on systems that do not require them, following Microsoft guidance and internal change control.
# Verify installed updates on a Windows host
wmic qfe list brief /format:table
# PowerShell alternative to enumerate installed hotfixes
Get-HotFix | Sort-Object -Property InstalledOn -Descending
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
