CVE-2025-49752

Published Nov 20, 2025

Last updated 14 days ago

Azure Bastion

Overview

AI description

Automated description summarized from trusted sources.

CVE-2025-49752 is an authentication bypass vulnerability in Microsoft's Azure Bastion, a managed service providing secure RDP and SSH connectivity to virtual machines in Azure. The vulnerability, classified as CWE-294 (Authentication Bypass by Capture-Replay), allows a remote attacker to potentially gain administrative privileges on all VMs accessible via Bastion. Attackers can intercept and replay valid authentication tokens to gain unauthorized access. Exploitation requires only a single network request and no user interaction. All Azure Bastion implementations prior to the security update released on November 20, 2025, are potentially vulnerable.

Description: Azure Bastion Elevation of Privilege Vulnerability
Source: secure@microsoft.com
NVD status: Analyzed
CNA Tags: exclusively-hosted-service
Products: azure_bastion_developer

Risk scores

CVSS 3.1

Type: Secondary
Base score: 10
Impact score: 6
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
Severity: CRITICAL

Weaknesses

secure@microsoft.com: CWE-294

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "negate": false,
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:microsoft:azure_bastion_developer:-:*:*:*:*:*:*:*",
            "vulnerable": true,
            "matchCriteriaId": "F4B68077-90CE-41F2-ADE8-64D1C897EBC9"
          }
        ],
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.