Microsoft, Fortinet & Ivanti Warn About Actively Exploited Zero Day Vulnerabilities

Posted By Steve Alder on May 14, 2025

Microsoft, Fortinet & Ivanti have all notified customers about vulnerabilities in their products that are known to have been exploited by threat actors. Prompt patching is strongly recommended, and workaround/mitigations should be implemented if patching must be delayed.

Microsoft

On Patch Tuesday, Microsoft issued patches for five vulnerabilities known to have been exploited in the wild, plus two publicly disclosed zero-day vulnerabilities. The actively exploited  vulnerabilities are:

The following vulnerabilities have been publicly disclosed:

Microsoft also released patches for six critical vulnerabilities that are not known to have been exploited but should be prioritized. They affect Microsoft Office (CVE-2025-30377 and CVE-2025-30386), Microsoft Power Apps (CVE-2025-47733), Remote Desktop Gateway Service (CVE-2025-29967), and Windows Remote Desktop (CVE-2025-29966).

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Fortinet

Fortinet has issued a security advisory about a critical vulnerability affecting its FortiVoice, FortiMail, FortiNDR, FortiRecorder, and FortiCamera products. The stack-based buffer overflow vulnerability has been assigned a CVSS v4 severity score of 9.6 (CVSS v3.1: 9.8) and can be exploited by a remote unauthenticated hacker by sending HTTP requests with a specially crafted hash cookie. Successful exploitation of the vulnerability can allow arbitrary code execution.

Fortinet said it has observed exploitation of the vulnerability on FortiVoice. The threat actor scanned the device network, erased system crashlogs, and enabled fcgi debugging to log credentials from the system or SSH login attempts. The vulnerability is tracked as CVE-2025-32756 and affects the following product versions:

Fortinet has issued indicators of Compromise in its security alert. If immediate patching is not possible, Fortinet recommends disabling the HTTP/HTTPS administrative interface

Ivanti

Ivanti has issued a security advisory about two vulnerabilities affecting the Ivanti Endpoint Manager Mobile (EPMM) solution, one is a medium severity flaw and the other is high severity flaw. The two vulnerabilities can be chained together and can allow unauthenticated remote code execution. Ivanti explained that the two vulnerabilities are associated with open-source code used in the EPMM, and not within Ivanti’s code.

The medium severity flaw is tracked as CVE-2025-4427 and is an authentication bypass flaw with a CVSS v3.1 severity score of 5.3. The second vulnerability is a remote code execution vulnerability with a CVSS v3.1 severity score of 7.2

Ivanti said users should upgrade to the latest version as soon as possible; however, risk can be greatly reduced if the user filters access to the API using the built-in Portal ACLs or an external WAF.