Overview
The CVE-2025-7382 is a high-risk vulnerability that affects the WebAdmin interface of Sophos Firewall versions older than 21.0 MR2 (21.0.2). This command injection vulnerability poses a serious threat to organizations as it allows adjacent attackers to execute arbitrary code on High Availability (HA) auxiliary devices without needing to authenticate first, provided OTP authentication for the admin user is enabled. As such, it’s crucial for network administrators and cybersecurity professionals to understand the implications of this vulnerability and how to mitigate its potential impact.
Vulnerability Summary
CVE ID: CVE-2025-7382
Severity: High (8.8)
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
Sophos Firewall | Older than 21.0 MR2 (21.0.2)
How the Exploit Works
The exploit takes advantage of a command injection weakness in the WebAdmin interface of older Sophos Firewall versions. Attackers can craft malicious inputs that are interpreted as part of the command to be executed by the system. When these inputs are processed, the system executes the attacker’s code, hence achieving pre-auth code execution on HA auxiliary devices.
Conceptual Example Code
A conceptual example of exploiting this vulnerability could involve sending a malicious HTTP POST request to a vulnerable endpoint, as illustrated below:
POST /WebAdmin/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_command": "rm -rf /*" }In this example, if the malicious_command payload is processed by the system, it could potentially delete all files, leading to a system compromise.
Mitigation
The most effective way to mitigate the impact of CVE-2025-7382 is to apply the vendor-provided patch, which upgrades the Sophos Firewall to a version where this vulnerability is fixed (21.0 MR2 or later). In case applying the patch is not immediately feasible, using a Web Application Firewall (WAF) or an Intrusion Detection System (IDS) can serve as temporary mitigation measures, preventing the execution of malicious commands. Regular monitoring and updating of system components and applications is a best practice that can help prevent future vulnerabilities.