Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-53859
CVE-2025-53859:
NGINX vulnerability analysis and mitigation
Overview
CVE-2025-53859 affects the ngxmailsmtp_module in nginx versions 0.7.22 through 1.29.0. The vulnerability was discovered and disclosed on August 13, 2025, impacting the SMTP authentication process in the nginx mail module (Nginx Announce).
Technical details
The vulnerability is a buffer over-read issue in the ngxmailsmtp_module when processing specially crafted login/password combinations using the "none" authentication method. This could potentially lead to worker process memory disclosure to the authentication server (OSS Security).
Impact
The vulnerability could result in sensitive information leakage through HTTP requests to the authentication server. The issue requires specific preparations by an attacker against the target system to extract the leaked data (OSS Security).
Mitigation and workarounds
The issue has been fixed in nginx version 1.29.1. For older versions, two temporary workarounds are available: 1) disable the "none" parameter in the "smtp_auth" directive, or 2) remove the "Auth-Wait" header line in the authentication server response. A patch is also available at https://nginx.org/download/patch.2025.smtp.txt (OSS Security).
Additional resources
Source: This report was generated using AI
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