Advisory Details

August 14th, 2025

Microsoft Teams Real Time Media Manager Integer Underflow Remote Code Execution Vulnerability

ZDI-25-839
ZDI-CAN-26363

CVE ID CVE-2025-53783
CVSS SCORE 9.8, AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
AFFECTED VENDORS Microsoft
AFFECTED PRODUCTS Teams
VULNERABILITY DETAILS

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft Teams. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the real time media manager. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process.

ADDITIONAL DETAILS Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53783
DISCLOSURE TIMELINE
  • 2025-04-16 - Vulnerability reported to vendor
  • 2025-08-14 - Coordinated public release of advisory
  • 2025-08-14 - Advisory Updated
CREDIT Anonymous
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