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CVE-2026-53581— ntp: write path traversal

Quick assessment

Affected
opnsense core
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OPNsense是OPNsense组织的一款网络防火墙与路由器操作系统。 OPNsense 26.1.9之前版本和OPNsense 26.4_20之前版本存在安全漏洞，该漏洞源于NTP配置模块存在路径遍历问题，攻击者通过操纵GPS或PPS串行端口参数，可逃逸预期目录，以root用户身份将用户控制的数据写入文件系统任意文件，导致覆盖系统上的任意文件。

CVSS 9.0 · Critical EPSS 0.47% · P40

Possible ATT&CK Techniques 1 AI

T1083 · File and Directory Discovery

Affected Version Matrix 2

VendorProduct Version RangeStatus
opnsense core < 26.1.9 affected
< 26.4_20 affected
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I. Basic Information for CVE-2026-53581

Vulnerability Information
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Vulnerability Title
ntp: write path traversal
Source: CVE Program / CVE List V5
Vulnerability Description
OPNsense is a FreeBSD based firewall and routing platform. Prior to version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and force the system to write user-controlled data to any file on the filesystem. Version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core patch the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
OPNsense 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OPNsense是OPNsense组织的一款网络防火墙与路由器操作系统。 OPNsense 26.1.9之前版本和OPNsense 26.4_20之前版本存在安全漏洞，该漏洞源于NTP配置模块存在路径遍历问题，攻击者通过操纵GPS或PPS串行端口参数，可逃逸预期目录，以root用户身份将用户控制的数据写入文件系统任意文件，导致覆盖系统上的任意文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opnsense core < 26.1.9 -

II. Public POCs for CVE-2026-53581

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III. Intelligence Information for CVE-2026-53581

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Vendor Advisories for CVE-2026-53581 (1)

IV. Related Vulnerabilities

Same product: core
Same vendor: opnsense
Same weakness: CWE-22

V. Comments for CVE-2026-53581

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