Platform
exchange
Component
microsoft-exchange-server
Fixed in
15.01.2507.061
15.02.1544.036
15.02.1748.039
15.02.2562.029
CVE-2025-59249 describes a privilege escalation vulnerability discovered in Microsoft Exchange Server. This flaw allows an authenticated attacker to gain elevated privileges within the network, potentially leading to unauthorized access and control. The vulnerability impacts Exchange Server versions 15.01.0.0 through 15.02.2562.029, and a fix is available in version 15.02.2562.029.
Successful exploitation of CVE-2025-59249 could allow an attacker with existing, limited access to an Exchange Server to significantly escalate their privileges. This could enable them to access sensitive email data, modify configurations, and potentially pivot to other systems within the network. The impact is particularly severe in environments where Exchange Server handles critical business communications or stores confidential information. A compromised Exchange Server could be used as a launchpad for further attacks, leading to widespread data breaches and operational disruption. The ability to elevate privileges over the network represents a significant security risk.
CVE-2025-59249 was publicly disclosed on 2025-10-14. The vulnerability's severity is rated HIGH (CVSS: 8.8). As of this writing, no public proof-of-concept exploits are known, but the ease of privilege escalation suggests a potential for rapid exploitation if a PoC is released. Monitor security advisories and threat intelligence feeds for any indications of active exploitation campaigns. This CVE has not yet been added to the CISA KEV catalog.
Exploit Status
EPSS
0.07% (22% percentile)
CISA SSVC
CVSS Vector
The primary mitigation for CVE-2025-59249 is to upgrade Microsoft Exchange Server to version 15.02.2562.029 or later. Before upgrading, review Microsoft's official guidance for compatibility and potential breaking changes. If an immediate upgrade is not possible, consider implementing network segmentation to limit the potential blast radius of a successful attack. Review existing authentication mechanisms and enforce multi-factor authentication (MFA) wherever possible to reduce the likelihood of an attacker gaining initial access. After upgrading, verify the fix by attempting to reproduce the vulnerability using known attack vectors and confirming that privilege escalation is prevented.
Update Microsoft Exchange Server to the latest available version. Refer to the Microsoft security bulletin for detailed instructions on how to apply the necessary updates to mitigate this privilege escalation vulnerability.
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CVE-2025-59249 is a HIGH severity vulnerability allowing an authenticated attacker to escalate privileges within Microsoft Exchange Server versions 15.01.0.0 through 15.02.2562.029, potentially gaining unauthorized access.
You are affected if you are running Microsoft Exchange Server versions 15.01.0.0 through 15.02.2562.029 and have not yet upgraded to the patched version.
Upgrade Microsoft Exchange Server to version 15.02.2562.029 or later. Review Microsoft's official guidance before upgrading to ensure compatibility.
As of this writing, no public proof-of-concept exploits are known, but the potential for exploitation exists.
Refer to the official Microsoft Security Update Guide for CVE-2025-59249: [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59249](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59249)
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