CVE-2025-27440: Zoom Meeting SDK Privilege Escalation Flaw

CVE-2025-27440 Overview

CVE-2025-27440 is a heap overflow vulnerability affecting multiple Zoom Workplace applications across various platforms. This memory corruption flaw allows an authenticated user to escalate privileges through network access, potentially compromising the confidentiality, integrity, and availability of affected systems. The vulnerability impacts a wide range of Zoom products including Workplace Desktop, Rooms, Rooms Controller, and the Meeting Software Development Kit across Windows, macOS, Linux, Android, and iOS platforms.

Critical Impact

An authenticated attacker can exploit this heap overflow vulnerability via network access to achieve privilege escalation, potentially gaining elevated access to system resources and compromising enterprise communication infrastructure.

Affected Products

• Zoom Workplace Desktop (Windows, macOS, Linux)
• Zoom Workplace (Android, iOS)
• Zoom Workplace Virtual Desktop Infrastructure (Windows)
• Zoom Rooms (Windows, macOS, Android, iPadOS)
• Zoom Rooms Controller (Windows, macOS, Linux, Android)
• Zoom Meeting Software Development Kit (Windows, macOS, Linux, Android, iOS)

Discovery Timeline

• 2025-03-11 - CVE-2025-27440 published to NVD
• 2025-10-22 - Last updated in NVD database

Technical Details for CVE-2025-27440

Vulnerability Analysis

CVE-2025-27440 is classified under CWE-124 (Buffer Underwrite), indicating a memory corruption issue where data is written before the start of a buffer. In this case, the vulnerability manifests as a heap overflow condition within certain Zoom Workplace applications. When exploited, the flaw allows an authenticated user with network access to corrupt heap memory structures, potentially overwriting critical application data or function pointers.

The exploitation requires authenticated access to the Zoom application, meaning an attacker must first have valid credentials or an active session within the Zoom environment. Once authenticated, the attacker can craft malicious network requests that trigger the heap overflow condition, leading to memory corruption that can be leveraged for privilege escalation.

The impact of successful exploitation is significant, as it can compromise the confidentiality, integrity, and availability of the affected system. In enterprise environments where Zoom is deployed at scale, this vulnerability could serve as a pivot point for lateral movement or as a means to gain elevated access to sensitive communications and meeting data.

Root Cause

The root cause of this vulnerability lies in improper memory management within the affected Zoom applications. Specifically, the heap overflow occurs due to insufficient boundary checking when processing certain data structures, allowing data to be written beyond allocated heap buffer boundaries. This type of vulnerability (CWE-124) typically arises from:

• Incorrect calculation of buffer sizes before memory allocation
• Missing or inadequate validation of user-controlled input that influences memory operations
• Pointer arithmetic errors that cause writes to unintended memory locations

The vulnerability affects multiple Zoom products across various operating systems, suggesting the flawed code may reside in a shared component or library used across the Zoom product suite.

Attack Vector

The attack vector for CVE-2025-27440 is network-based, requiring the attacker to have authenticated access to the vulnerable Zoom application. The exploitation flow involves:

1. Authentication: The attacker must first authenticate to the Zoom application, obtaining a valid session
2. Malicious Request: Crafting and sending a specially designed network request that triggers the heap overflow condition
3. Memory Corruption: The overflow corrupts heap memory, potentially overwriting function pointers or critical data structures
4. Privilege Escalation: The corrupted memory state is leveraged to execute code with elevated privileges or bypass security controls

The attack does not require user interaction and can be performed remotely once authentication is established, making it particularly concerning for organizations with compromised credentials or insider threat scenarios.

Detection Methods for CVE-2025-27440

Indicators of Compromise

• Unexpected crashes or instability in Zoom Workplace applications that may indicate exploitation attempts
• Anomalous memory consumption patterns in Zoom processes, particularly sudden spikes in heap usage
• Unusual network traffic patterns to/from Zoom applications, especially malformed or oversized packets
• Evidence of privilege escalation or unauthorized access following Zoom application usage

Detection Strategies

• Deploy endpoint detection and response (EDR) solutions capable of monitoring heap memory operations and detecting overflow conditions
• Implement network traffic analysis to identify malformed requests targeting Zoom applications
• Enable application-level logging for Zoom clients and monitor for crash events or error conditions
• Utilize memory protection technologies such as ASLR and DEP verification to detect exploitation attempts

Monitoring Recommendations

• Monitor Zoom application processes for unexpected child process creation or unusual system calls
• Track network connections from Zoom applications for anomalous destinations or data volumes
• Review system and application logs for authentication anomalies preceding any Zoom-related crashes
• Implement file integrity monitoring on Zoom installation directories to detect unauthorized modifications

How to Mitigate CVE-2025-27440

Immediate Actions Required

• Update all affected Zoom Workplace applications to the latest patched versions immediately
• Review and audit user accounts with access to Zoom applications, removing unnecessary privileges
• Implement network segmentation to limit the potential impact of successful exploitation
• Enable enhanced logging and monitoring for Zoom application activity across the enterprise

Patch Information

Zoom has released security updates to address this vulnerability. Organizations should consult the Zoom Security Bulletin ZSB-25011 for specific version information and download links for patched releases. The bulletin provides detailed guidance on affected versions and the corresponding fixed versions for each product.

All Zoom Workplace products should be updated through official channels, and organizations using the Meeting Software Development Kit should ensure their applications incorporate the updated SDK libraries.

Workarounds

• Restrict network access to Zoom applications by implementing firewall rules that limit connectivity to known Zoom infrastructure
• Enforce strong authentication policies and multi-factor authentication for Zoom accounts to reduce the risk of credential-based exploitation
• Consider deploying application whitelisting or allowlisting solutions to prevent unauthorized code execution
• Implement network-level monitoring and intrusion detection to identify potential exploitation attempts before they succeed

# Example: Verify Zoom application version on Windows
# Check if running a vulnerable version and prioritize updates
Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\*" | 
  Where-Object { $_.DisplayName -like "*Zoom*" } | 
  Select-Object DisplayName, DisplayVersion

# Example: Monitor Zoom processes for anomalous behavior
Get-Process -Name "Zoom*" | Select-Object Name, Id, WorkingSet64, CPU