Detections
Analytics

nginx 0.7.22 < 1.29.1 Information Disclosure

medium Nessus Plugin ID 253588

Synopsis

The remote web server is affected by a vulnerability.

Description

According to its Sever response header, the installed version of nginx is 0.7.22 prior to 1.29.1. It is, therefore, affected by the following issue :

 - NGINX Open Source and NGINX Plus have a vulnerability in the ngx_mail_smtp_module that might allow an unauthenticated attacker to over-read NGINX SMTP authentication process memory; as a result, the server side may leak arbitrary bytes sent in a request to the authentication server. This issue happens during the NGINX SMTP authentication process and requires the attacker to make preparations against the target system to extract the leaked data. The issue affects NGINX only if (1) it is built with the ngx_mail_smtp_module, (2) the smtp_auth directive is configured with method none, and (3) the authentication server returns the Auth-Wait response header. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. (CVE-2025-53859)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to nginx 1.29.1 or later.

See Also

https://my.f5.com/manage/s/article/K000152786

https://www.cve.org/CVERecord?id=CVE-2025-53859

Plugin Details

Severity: Medium

ID: 253588

File Name: nginx-CVE-2025-53859.nasl

Version: 1.1

Type: combined

Agent: unix

Family: Web Servers

Published: 8/22/2025

Updated: 8/22/2025

Configuration: Enable paranoid mode

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.9

CVSS v2

Risk Factor: Low

Base Score: 2.6

Temporal Score: 1.9

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N

CVSS Score Source: CVE-2025-53859

CVSS v3

Risk Factor: Low

Base Score: 3.7

Temporal Score: 3.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Medium

Base Score: 6.3

Threat Score: 1.7

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

CPE: cpe:/a:igor_sysoev:nginx

Required KB Items: Settings/ParanoidReport, installed_sw/nginx

Exploit Ease: No known exploits are available

Patch Publication Date: 8/13/2025

Vulnerability Publication Date: 8/13/2025

Reference Information

CVE: CVE-2025-53859

IAVA: 2025-A-0615