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CVE-2025-21487: Information Disclosure Vulnerability in RTP Packet Decoding

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Overview

The Common Vulnerabilities and Exposures (CVE) system has recently identified a critical vulnerability, CVE-2025-21487, that can potentially lead to a system compromise or data leakage due to an information disclosure flaw. This vulnerability affects systems that process RTP (Real-time Transport Protocol) packets, which are commonly used in communication and entertainment systems that involve streaming media, such as telephony, video teleconference applications, and television services. It is critical to address this vulnerability due to its high severity score of 8.2, indicating a significant risk to affected systems.

Vulnerability Summary

CVE ID: CVE-2025-21487
Severity: High (CVSS: 8.2)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: System compromise, Data leakage

Affected Products

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Product | Affected Versions

RTP Processing Application | All prior versions

How the Exploit Works

The exploit involves sending an RTP packet with a payload length that exceeds the buffer length of the receiving system. During the decoding process, if the payload length mentioned in the packet is greater than the available buffer length, the system will disclose sensitive information. This information could be used by an attacker to compromise the system or leak data.

Conceptual Example Code

Here’s a conceptual example of an RTP packet that could potentially exploit this vulnerability:

POST /RTP/decode HTTP/1.1
Host: target.example.com
Content-Type: application/rtp
{
"header": {
"payload_type": "example",
"sequence_number": 12345,
"timestamp": 1234567890,
"ssrc": "source1"
},
"payload": "a very long string that is longer than the buffer length....."
}

Mitigation

To mitigate this vulnerability, it’s recommended to apply the patch provided by the vendor. If the patch cannot be applied immediately, using a Web Application Firewall (WAF) or Intrusion Detection System (IDS) can offer temporary protection by blocking or detecting malicious RTP packets. However, these are temporary solutions and do not fix the underlying issue. It is critical to apply the patch as soon as feasible to ensure the continued security of your systems.

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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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