CVE-2025-27440
Published: 11 March 2025
Summary
CVE-2025-27440 is a high-severity Buffer Underflow (CWE-124) vulnerability in Zoom Meeting Software Development Kit. Its CVSS base score is 8.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked in the top 34.4% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-16 (Memory Protection) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2025-27440 is a heap overflow vulnerability (CWE-124) affecting some Zoom Workplace Apps. Published on March 11, 2025, it carries a CVSS v3.1 base score of 8.5 (AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H), indicating high severity due to its potential for significant impact across confidentiality, integrity, and availability when successfully exploited.
An authenticated user with low privileges (PR:L) can exploit this vulnerability over the network (AV:N), though it requires high attack complexity (AC:H) and no user interaction (UI:N). Successful exploitation enables escalation of privilege, with the changed scope (S:C) allowing the attacker to achieve high-impact outcomes, including unauthorized access to sensitive data, modification of system resources, and disruption of services.
Zoom's security bulletin at https://www.zoom.com/en/trust/security-bulletin/zsb-25011/ provides details on mitigation, including available patches for affected Zoom Workplace Apps. Security practitioners should consult this advisory for version-specific remediation steps and apply updates promptly to prevent exploitation.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-7783
Vulnerability details
Heap overflow in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via network access.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
The heap overflow vulnerability explicitly enables privilege escalation for an authenticated low-privileged user, directly mapping to T1068 Exploitation for Privilege Escalation.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly mitigates the heap overflow vulnerability by requiring timely remediation through application of vendor patches detailed in Zoom's security bulletin.
Provides comprehensive memory protections to prevent unauthorized code execution from heap overflow exploitation leading to privilege escalation.
Limits the potential impact of privilege escalation by enforcing least privilege for authenticated low-privilege users exploiting the vulnerability.