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 3.9% 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-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
Adobe Connect versions 24.0 and earlier contain a deserialization of untrusted data vulnerability, tracked as CVE-2025-27203 and assigned CWE-502. The flaw carries a CVSS 3.1 score of 9.6 with the vector AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H, indicating that untrusted data can be deserialized to achieve arbitrary code execution when the affected server processes attacker-supplied input.
An unauthenticated remote attacker can trigger the issue by sending a crafted payload that the victim must interact with, after which code execution occurs with changed scope. Successful exploitation grants the attacker full control over confidentiality, integrity, and availability on the targeted Adobe Connect instance.
The vendor advisory at https://helpx.adobe.com/security/products/connect/apsb25-61.html addresses the issue. The associated EPSS score rose from a low baseline after disclosure to a peak of 0.2524 on 2026-04-03 before receding to the current value of 0.2350, indicating that exploitation interest increased post-publication.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2025-20691
Vulnerability details
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.
- CWE(s)
Related Threats
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).
CVEs Like This One
Affected Assets
Mitigating Controls
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.