Full Report
A vulnerability has been discovered in Zoom Clients that could allow for remote code execution. Zoom is a cloud-based communications platform that allows users to connect via video, audio, chat, and content sharing. Successful exploitation could allow an attacker to target meeting participants, execute code without user interaction, steal data, activate cameras or microphones, and install malware.
Analysis Summary
# Vulnerability: "Zoomsday" Zero-Click Remote Code Execution in Zoom Clients
## CVE Details
- **CVE ID:** CVE-2026-53413
- **CVSS Score:** Not explicitly listed, but categorized as **High/Critical** impact.
- **CWE:** CWE-120 (Buffer Overflow / Missing bounds check)
## Affected Systems
- **Zoom Workplace (All platforms):** Versions prior to 7.1.5 and 7.0.6 (respective branches).
- **Zoom Workplace VDI Client (Windows):** Versions prior to 7.0.11 and 6.6.16 (respective branches).
- **Zoom Rooms (All platforms):** Versions prior to 7.1.0.
- **Zoom Meeting SDK (All platforms):** Versions prior to 7.1.0.
## Vulnerability Description
A missing bounds check exists in the **annotator function** of Zoom Clients. This flaw allows for a buffer overwrite via network access. Because the vulnerability is triggered through the processing of malicious meeting data, a meeting participant can achieve remote code execution (RCE) on another participant's device without any user interaction (Zero-Click).
## Exploitation
- **Status:** No reports of exploitation in the wild (as of August 12, 2026); dubbed "Zoomsday" by researchers.
- **Complexity:** Medium (requires joining/hosting a meeting).
- **Attack Vector:** Network (Remote).
- **Interaction:** None (Zero-Click).
## Impact
- **Confidentiality:** High (Stealing data, activating camera/microphone).
- **Integrity:** High (Executing arbitrary code, installing malware).
- **Availability:** High (Full device compromise).
## Remediation
### Patches
Update to the following versions or higher:
- **Zoom Workplace:** 7.1.5 or 7.0.6
- **Zoom Workplace VDI (Windows):** 7.0.11 or 6.6.16
- **Zoom Rooms:** 7.1.0
- **Zoom Meeting SDK:** 7.1.0
### Workarounds
- Enable OS-level exploit protections (DEP, Windows Defender Exploit Guard, Apple SIP/Gatekeeper).
- Implement network segmentation to limit the blast radius of compromised endpoints.
- Restrict meeting access to authenticated/internal users only where possible until patched.
## Detection
- **Indicators of Compromise:** Unusual outbound network traffic from Zoom processes; unauthorized activation of peripheral hardware (webcams/mics).
- **Detection Methods:** Use vulnerability scanners (SCAP-compliant) to identify outdated Zoom binaries; monitor for crashes in the Zoom annotator module which may indicate failed exploitation attempts.
## References
- **CVE Record:** hxxps[://]www[.]cve[.]org/CVERecord?id=CVE-2026-53413
- **Zoom Security Bulletin:** hxxps[://]www[.]zoom[.]com/en/trust/security-bulletin/zsb-26015/
- **Security Affairs:** hxxps[://]securityaffairs[.]com/197042/hacking/zoom-patches-zoomsday-zero-click-flaw-enabling-remote-code-execution[.]html