Overview
The cybersecurity field is always on high alert for any vulnerabilities that could compromise the security of systems and networks. In this blog post, we’re discussing a critical vulnerability, CVE-2025-45986, that affects multiple versions of Blink routers. This vulnerability, if exploited, can lead to system compromise or data leakage, posing a significant threat to the integrity, confidentiality, and availability of your data and systems.
Blink routers are widely used in homes and businesses, making this a concern for a broad range of users, from individual consumers to large corporations. The exploit takes advantage of a command injection vulnerability, which allows attackers to execute arbitrary commands on the system. This is a severe vulnerability that has been rated with a CVSS score of 9.8, emphasizing the urgency in addressing this issue.
Vulnerability Summary
CVE ID: CVE-2025-45986
Severity: Critical, CVSS 9.8
Attack Vector: Network
Privileges Required: Low
User Interaction: None
Impact: System compromise, potential data leakage
Affected Products
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Product | Affected Versions
BL-WR9000 | V2.4.9
BL-AC2100_AZ3 | V1.0.4
BL-X10_AC8 | v1.0.5
BL-LTE300 | v1.2.3
BL-F1200_AT1 | v1.0.0
BL-X26_AC8 | v1.2.8
BLAC450M_AE4 | v4.0.0
BL-X26_DA3 | v1.2.7
How the Exploit Works
The vulnerability lies in the bs_SetMacBlack function of the affected router firmware. This function accepts a ‘mac’ parameter without validating or sanitizing the input effectively. As a result, an attacker can inject malicious commands through this parameter, which are then executed by the system. This type of attack, known as command injection, can have devastating effects, including system compromise and data leakage.
Conceptual Example Code
The following is a conceptual example of how the vulnerability might be exploited. This is a sample HTTP POST request where a malicious command is injected through the ‘mac’ parameter.
POST /bs_SetMacBlack HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"mac": ";[malicious_command]"
}In this example, ‘[malicious_command]’ would be replaced with the actual command that the attacker wishes to execute on the system. The semicolon preceding the command is used to separate it from any preceding commands, allowing it to be executed independently.
Please note: This example is purely conceptual and meant for educational purposes. Attempting to exploit this vulnerability could be illegal and against the ethical guidelines of responsible cybersecurity.