CVE-2025-41368

High

Published: 26 March 2026

Published

26 March 2026

Modified

26 March 2026

KEV Added

—

Patch

—

CVSS Score 8.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

EPSS Score 0.0003 8.3th percentile

Risk Priority 16 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-41368 is a high-severity Path Traversal (CWE-22) vulnerability in Smallsrv Small Http Server. Its CVSS base score is 8.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 8.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 1 other technique. What defenders deploy: see the NIST 800-53 controls recommended below.

Threat & Defense Details

Mitigating Controls (NIST 800-53 r5)AI

SI-2 Flaw Remediation good match

prevent

Directly remediates the specific flaw in Small HTTP Server v3.06.36 that enables authenticated path traversal bypassing SecurityManager restrictions.

SI-10 Information Input Validation good match

prevent

Validates user-supplied path inputs at the '/' endpoint to block traversal sequences like '../' from accessing files outside the document root.

AC-6 Least Privilege partial match

prevent

Limits damage from successful traversal by restricting the web server process to least privilege, preventing access to sensitive files despite OS permissions.

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

T1005 Data from Local System Collection

Adversaries may search local system sources, such as file systems, configuration files, local databases, virtual machine files, or process memory, to find files of interest and sensitive data prior to Exfiltration.

attack.mitre.org →

Why these techniques?

Path traversal in public-facing HTTP server directly enables T1190 for initial exploitation and T1005 for arbitrary local file read/write.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

NVD Description

Problem in the Small HTTP Server v3.06.36 service. An authenticated path traversal vulnerability in '/' allows remote users to bypass the intended restrictions of SecurityManager and display any file if they have the appropriate permissions outside the document root configured…

on the server.

Deeper analysisAI

CVE-2025-41368 is an authenticated path traversal vulnerability (CWE-22) in Small HTTP Server version 3.06.36. The flaw occurs in the '/' endpoint of the service, enabling remote authenticated users to bypass SecurityManager restrictions and access any file outside the configured document root, provided they possess the necessary file permissions on the server. It carries a CVSS v3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N), indicating high severity due to its potential for unauthorized file disclosure and manipulation.

An attacker with low-privileged authenticated access over the network can exploit this vulnerability with low complexity and no user interaction required. Successful exploitation allows reading sensitive files beyond the web root and potentially altering them, leading to high impacts on confidentiality and integrity, such as exposing configuration files, credentials, or application data, while availability remains unaffected.

The INCIBE-CERT advisory addresses multiple vulnerabilities in Small HTTP Server, including CVE-2025-41368, and provides details at https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-small-http-server-smallsrv. Security practitioners should consult this reference for recommended mitigations, such as applying patches if available or restricting access to the affected service.