CVE-2025-33056
Published: 10 June 2025
Summary
CVE-2025-33056 is a high-severity Improper Access Control (CWE-284) vulnerability in Microsoft Windows Server 2008. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 9.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
The vulnerability CVE-2025-33056 stems from improper access control in the Microsoft Local Security Authority Server (lsasrv) component. It is tracked under CWE-284 and carries a CVSS 3.1 base score of 7.5 reflecting network attack vector, low complexity, and no required privileges or user interaction, with high impact limited to availability.
An unauthenticated attacker can send crafted network requests to trigger a denial-of-service condition against the affected lsasrv instance, disrupting authentication and security services on the target system without gaining code execution or data access.
Microsoft has published an advisory and associated guidance for this issue at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-33056. The current EPSS score of 0.0556 has shown no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-17742
Vulnerability details
Improper access control in Microsoft Local Security Authority Server (lsasrv) allows an unauthorized attacker to deny service over a network.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
The access control policy and procedures directly mandate and enforce proper access control mechanisms across the organization.
Device lock enforces restricted access until re-authentication, directly reducing unauthorized use of active sessions.
Supervision and review of access control activities directly detects and remediates improper access configurations or usages.
Explicitly identifying and documenting actions permitted without identification or authentication enforces proper access control boundaries by defining justified exceptions.
By automatically labeling outputs with security attributes, the control supports attribute-based enforcement and reduces exploitability of improper access control weaknesses.
Associating and retaining security attributes with data directly supports enforcement of access control decisions across storage, processing, and transmission.
Requiring prior authorization for each remote access type prevents improper access control over remote connections.
Requiring authorization of wireless access before allowing connections enforces proper access control for this access method.