CVE-2025-27439
Published: 11 March 2025
Summary
CVE-2025-27439 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 39.9% 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-2025-27439 is a buffer underflow vulnerability, classified under CWE-124, affecting some Zoom Workplace Apps. Published on 2025-03-11, 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). The issue may enable an authenticated user to achieve an escalation of privilege through network access.
An attacker with low privileges (PR:L), such as an authenticated user on the network, can exploit this vulnerability remotely (AV:N). Exploitation requires high attack complexity (AC:H) but no user interaction (UI:N), resulting in a scope change (S:C) with high impacts to confidentiality, integrity, and availability (C:H/I:H/A:H). Successful attacks allow privilege escalation within the affected Zoom Workplace Apps.
Mitigation details are provided in the Zoom security bulletin ZSB-25011, available at https://www.zoom.com/en/trust/security-bulletin/zsb-25011/. Security practitioners should consult this advisory for patching instructions and recommended actions.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-7782
Vulnerability details
Buffer underflow 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?
Buffer underflow vulnerability directly enables remote exploitation by authenticated users to achieve privilege escalation on affected Zoom apps.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly remediates the buffer underflow vulnerability through timely application of vendor patches as specified in the Zoom security bulletin ZSB-25011.
Provides memory protections such as address space layout randomization and data execution prevention to block exploitation of buffer underflow leading to code execution and privilege escalation.
Enforces least privilege to restrict low-privileged authenticated users from gaining elevated access even if the buffer underflow is exploited.