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CVE-2025-25235: Server-Side Request Forgery in Omnissa Secure Email Gateway

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Overview

CVE-2025-25235 is a serious Server-Side Request Forgery (SSRF) vulnerability that affects Omnissa Secure Email Gateway (SEG) running on Windows and UAG platforms. SSRF vulnerabilities are a common issue, but they are especially concerning when they exist in security infrastructure such as Omnissa’s SEG. The vulnerability’s impact is heightened due to the possibility of routing network traffic such as HTTP requests to internal networks, potentially leading to system compromise or data leaks.

Vulnerability Summary

CVE ID: CVE-2025-25235
Severity: High (8.6 CVSS Score)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise or data leakage

Affected Products

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Product | Affected Versions

Omnissa Secure Email Gateway (Windows) | Prior to 2.32
Omnissa Secure Email Gateway (UAG) | Prior to 2503

How the Exploit Works

The vulnerability lies in the ability of an attacker to manipulate the server into sending requests on their behalf. The SSRF vulnerability in Omnissa’s SEG allows an attacker to forge requests from the server to internal networks. This could potentially expose sensitive internal resources and data. Depending on the configuration of the internal network, this could even allow an attacker to bypass firewalls and access internal services.

Conceptual Example Code

The following is a conceptual example of how an attacker might exploit this vulnerability:

GET /fetch?url=http://internal.example.com/secrets HTTP/1.1
Host: vulnerable.example.com
Content-Type: application/json
{ "malicious_payload": "..." }

In this example, the attacker is instructing the vulnerable server to fetch a resource from an internal network (`http://internal.example.com/secrets`) and return the data.

Recommendations for Mitigation

The most effective mitigation for this vulnerability is to apply the vendor’s patch. Omnissa has released updates that rectify this SSRF vulnerability in SEG. Users running SEG on Windows should upgrade to version 2.32 or later, while users on UAG should upgrade to version 2503 or later.
In cases where patching is not immediately possible, use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can provide temporary mitigation. However, these should be seen as interim solutions only. Long-term security can only be assured by patching the vulnerability at its source.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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