CVE-2025-27203
Published: 08 July 2025
Summary
CVE-2025-27203 is a critical-severity Deserialization of Untrusted Data (CWE-502) vulnerability in Adobe Connect Desktop Application. Its CVSS base score is 9.6 (Critical).
Operationally, exploitation aligns with the MITRE ATT&CK technique Malicious Link (T1204.001); ranked in the top 4.0% 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-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Timely flaw remediation through vendor patches directly eliminates the deserialization vulnerability in Adobe Connect, preventing arbitrary code execution.
Information input validation ensures untrusted data is checked and sanitized before deserialization, blocking exploitation of CWE-502 in Adobe Connect.
Memory protection mechanisms like DEP and ASLR mitigate arbitrary code execution even if unsafe deserialization occurs in Adobe Connect.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Deserialization RCE in client app directly requires and is triggered by user opening malicious file or link (T1204 variants).
NVD Description
Adobe Connect versions 24.0 and earlier are affected by a Deserialization of Untrusted Data vulnerability that could lead to arbitrary code execution by an attacker. Exploitation of this issue does require user interaction and scope is changed.
Deeper analysisAI
CVE-2025-27203 is a Deserialization of Untrusted Data vulnerability (CWE-502) affecting Adobe Connect versions 24.0 and earlier. Published on 2025-07-08, it could allow an attacker to achieve arbitrary code execution. The vulnerability carries a CVSS v3.1 base score of 9.6 (AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H), indicating high severity due to its potential for network-accessible exploitation with low complexity and no required privileges, though user interaction is necessary.
An unauthenticated attacker can exploit this vulnerability remotely by tricking a user into interacting with malicious content, such as opening a specially crafted file or link within Adobe Connect. Successful exploitation changes the scope and grants high-impact access, enabling the attacker to compromise confidentiality, integrity, and availability of the affected system, potentially leading to full arbitrary code execution on the user's machine.
Adobe has addressed this issue in security bulletin APSB25-61, available at https://helpx.adobe.com/security/products/connect/apsb25-61.html, which provides details on patches and mitigation steps for affected versions.
Details
- CWE(s)