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CVE-2025-29785: QUIC protocol implementation vulnerability in quic-go

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Overview

This report provides an analysis of the CVE-2025-29785 vulnerability, which targets the QUIC protocol implementation in Go, specifically the quic-go package. This vulnerability can potentially lead to system compromise or data leakage, affecting systems that utilize the quic-go package in versions prior to v0.50.1. Given the severity of this vulnerability, it is crucial to understand its implications and apply the necessary mitigation measures.

Vulnerability Summary

CVE ID: CVE-2025-29785
Severity: High (CVSS: 7.5)
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

quic-go | < v0.50.1 How the Exploit Works

The exploit takes advantage of a nil-pointer dereference in the loss recovery logic for path probe packets in the quic-go package. This can be triggered by a malicious QUIC client sending valid QUIC packets from different remote addresses, thus triggering the path validation logic where the server sends path probe packets. Subsequently, the client sends ACKs for packets received from the server, crafted in a way that triggers the nil-pointer dereference.

Conceptual Example Code

Below is a conceptual representation of how the vulnerability might be exploited. This pseudocode represents the process of sending valid QUIC packets from different remote addresses followed by specially crafted ACKs.

# Pseudocode representation
for address in malicious_addresses:
send_valid_QUIC_packet(address)
receive_probe_packet()
send_malicious_ACK()

Please note that the above code is a conceptual representation and does not represent an actual exploit.

Mitigation Guidance

The recommended mitigation for this vulnerability is to apply the vendor-provided patch (v0.50.1). This patch fixes the nil-pointer dereference vulnerability. In situations where immediate patching is not feasible, temporary mitigation can be achieved through the use of a Web Application Firewall (WAF) or Intrusion Detection System (IDS). However, these measures only serve as a temporary solution and the vendor patch should be applied as soon as possible to fully address the vulnerability.

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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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