CVE-2025-48823 Overview
CVE-2025-48823 is an information disclosure vulnerability in Windows Cryptographic Services. The flaw stems from weak cryptographic implementation practices tracked under CWE-310 and CWE-326. An unauthenticated attacker can exploit this weakness over a network to disclose confidential information processed by the affected cryptographic subsystem. The vulnerability affects a broad range of Windows client and server releases still in active enterprise deployment. Microsoft addressed the issue through its Security Update Guide.
Critical Impact
Successful exploitation permits an unauthenticated remote attacker to disclose sensitive information handled by Windows Cryptographic Services, though attack complexity is high.
Affected Products
- Microsoft Windows 10 (versions 1507, 1607, 1809, 21H2, 22H2)
- Microsoft Windows 11 (versions 22H2, 23H2, 24H2)
- Microsoft Windows Server 2016, 2019, 2022, 2022 23H2, and 2025
Discovery Timeline
- 2025-07-08 - CVE-2025-48823 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-48823
Vulnerability Analysis
The vulnerability resides in Windows Cryptographic Services, the operating system component responsible for certificate handling, key storage, and cryptographic primitive operations. The flaw is categorized under CWE-310 (Cryptographic Issues) and CWE-326 (Inadequate Encryption Strength). These weaknesses indicate that the implementation relies on cryptographic constructs that fail to provide the intended confidentiality guarantees. An attacker with network access can leverage the weakness to recover information that should remain protected. The EPSS probability sits at 0.559%, indicating limited observed exploitation activity to date.
Root Cause
The root cause is inadequate encryption strength or improper cryptographic protection within Windows Cryptographic Services. When the service processes protected data, the underlying primitive or protocol does not enforce sufficient confidentiality margins. This deficiency creates a channel through which an attacker can infer plaintext or key material from observable outputs. Microsoft has not published exhaustive internal technical detail beyond the advisory.
Attack Vector
Exploitation requires network access to a system running an affected version of Windows Cryptographic Services. The attacker does not need authentication or user interaction. However, the attack requires specific conditions to be met, reflecting the high attack complexity involved. Successful exploitation yields disclosure of confidential information without altering system integrity or availability. See the Microsoft Security Update Guide for CVE-2025-48823 for vendor-provided technical detail.
No public proof-of-concept code is available. The vulnerability manifests
within Windows Cryptographic Services when processing network-facing
cryptographic operations. Refer to the Microsoft Security Update Guide
for authoritative technical details.
Detection Methods for CVE-2025-48823
Indicators of Compromise
- No public indicators of compromise have been published for CVE-2025-48823 at the time of this advisory.
- Absence of the corresponding Microsoft security update on Windows endpoints and servers is the strongest environmental indicator of exposure.
Detection Strategies
- Enumerate installed patches across the fleet and flag hosts missing the Microsoft update that addresses CVE-2025-48823.
- Monitor anomalous inbound network traffic targeting services that consume Windows Cryptographic Services, including TLS, SChannel, and certificate-based authentication endpoints.
- Correlate repeated failed or unusual cryptographic negotiation attempts with source reputation data to surface reconnaissance activity.
Monitoring Recommendations
- Ingest Windows Security and System event logs into a centralized analytics platform to observe cryptographic subsystem behavior at scale.
- Track outbound data flows from servers exposing cryptographic services for volume anomalies that may indicate information leakage.
- Maintain a current asset inventory mapping Windows versions to patch state so remediation gaps are visible in real time.
How to Mitigate CVE-2025-48823
Immediate Actions Required
- Apply the Microsoft security update referenced in the MSRC advisory for CVE-2025-48823 to all affected Windows client and server systems.
- Prioritize internet-facing hosts and servers offering TLS, RDP, LDAPS, or other cryptographic services for patch deployment.
- Verify successful patch installation with configuration management tooling and rescan the environment to confirm remediation.
Patch Information
Microsoft has released security updates that address CVE-2025-48823 across all supported affected Windows versions. Administrators should consult the Microsoft Security Update Guide for the specific KB article and package matching each Windows build in their environment. Windows Update, WSUS, and Microsoft Update Catalog are the primary distribution channels.
Workarounds
- No official workarounds have been published by Microsoft. Patching remains the required remediation path.
- Restrict network exposure of cryptographic services through firewall segmentation and least-privilege network access controls until the update is applied.
- Enforce TLS termination on hardened proxies where feasible to reduce the attack surface of unpatched backend systems.
# Verify installed updates on Windows and confirm the KB addressing CVE-2025-48823 is present
Get-HotFix | Sort-Object -Property InstalledOn -Descending | Select-Object -First 20
# Force an update check via Windows Update
USOClient.exe StartScan
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
