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CVE-2025-5456: Buffer Over-read Vulnerability in Ivanti Software Suites Risking Denial of Service

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Overview

The vulnerability, identified as CVE-2025-5456, presents a significant threat to users of several Ivanti software products. It involves a buffer over-read weakness that could potentially lead to a system compromise or data leakage. The vulnerability affects a wide range of Ivanti products and versions and poses a substantial risk due to its high CVSS severity score of 7.5.

Vulnerability Summary

CVE ID: CVE-2025-5456
Severity: High – CVSS 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Potential system compromise, data leakage, and denial of service

Affected Products

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Product | Affected Versions

Ivanti Connect Secure | Before 22.7R2.8 or 22.8R2
Ivanti Policy Secure | Before 22.7R1.5
Ivanti ZTA Gateway | Before 2.8R2.3-723
Ivanti Neurons for Secure Access | Before 22.8R1.4

How the Exploit Works

The CVE-2025-5456 vulnerability exploits a buffer over-read weakness in the Ivanti software. A buffer over-read occurs when more data is read than should be allowed, causing a system to crash or become unstable. In this case, an unauthenticated attacker could remotely trigger a denial of service, compromising the system and potentially leading to data leakage.

Conceptual Example Code

Here is a
conceptual
example of how this vulnerability might be exploited:

GET /vulnerable/data HTTP/1.1
Host: target.example.com
Range: bytes=0-99999999
HTTP/1.1 206 Partial Content
Content-Range: bytes 0-99999999/100000000
Content-Length: 100000000
{ "malicious_payload": "..." }

In this example, the attacker requests more data than the server should allow, leading to a buffer over-read and triggering a denial of service.

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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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