Overview
The cybersecurity vulnerability CVE-2025-27203 poses a significant threat to Adobe Connect users running versions 24.0 and earlier. Adobe Connect, a widely used communication platform, could be leveraged to execute arbitrary code by an attacker, leading to potential system compromise or data leakage. This vulnerability is particularly dangerous because of its high CVSS Severity Score and the necessity for immediate mitigation to protect sensitive data and maintain system integrity.
Vulnerability Summary
CVE ID: CVE-2025-27203
Severity: Critical (CVSS: 9.6)
Attack Vector: Network
Privileges Required: None
User Interaction: Required
Impact: Arbitrary code execution, potential system compromise, and data leakage
Affected Products
Escape the Surveillance Era
Most apps won’t tell you the truth.
They’re part of the problem.
Phone numbers. Emails. Profiles. Logs.
It’s all fuel for surveillance.
Ameeba Chat gives you a way out.
- • No phone number
- • No email
- • No personal info
- • Anonymous aliases
- • End-to-end encrypted
Chat without a trace.
Product | Affected Versions
Adobe Connect | 24.0 and earlier
How the Exploit Works
The exploit leverages a Deserialization of Untrusted Data vulnerability in Adobe Connect. This vulnerability is due to insecure deserialization, where an attacker could manipulate serialized (or deserialized) data and use it to pass harmful input into the application, potentially leading to arbitrary code execution. In this case, an attacker can trigger the vulnerability through user interaction, such as enticing a user to click on a malicious link or open a compromised file, leading to system compromise or data leakage.
Conceptual Example Code
Here is a conceptual example of how the vulnerability might be exploited. This code represents a malicious serialized object that, when deserialized, could lead to the execution of arbitrary code:
POST /vulnerable/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/serialized-object
{ "serialized_object": "rO0ABXNyABdqYXZhLnV0aWwucHJv..." }In this example, the `serialized_object` is a base64 encoded serialized Java object that, when deserialized, could lead to execution of arbitrary code.
Mitigation and Remediation
Adobe has released a patch to address this vulnerability. All users running Adobe Connect version 24.0 or earlier should apply this patch immediately. If immediate patching is not possible, users should consider implementing a Web Application Firewall (WAF) or Intrusion Detection System (IDS) as a temporary mitigation measure. These systems can detect and block attempts to exploit this vulnerability, providing a layer of defense until patching can be performed.