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CVE-2026-58127— PACSgear MediaWriter 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service

Quick assessment

Affected
Hyland PACSgear MediaWriter
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.

Hyland PACSgear MediaWriter是美国Hyland公司的一款医疗影像数据刻录工具。 Hyland PACSgear MediaWriter 5.2.1版本存在安全漏洞，该漏洞源于通过PacsgearMediaServerEngine.dll公开的.NET Remoting TCP服务未设置身份验证，且在反序列化过程中利用MarshalByRefObject对象解组技术和.NET WebClient类方法，导致未经身份验证的远程攻击者可以读取和写入主机文件系统的任意文件，并进一步结合D

CVSS 9.8 · Critical EPSS 1.88% · P79

Affected Version Matrix 1

VendorProduct Version RangeStatus
Hyland PACSgear MediaWriter 5.2.1 affected
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I. Basic Information for CVE-2026-58127

Vulnerability Information
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Vulnerability Title
PACSgear MediaWriter 5.2.1 Unauthenticated RCE via .NET Remoting TCP Service
Source: CVE Program / CVE List V5
Vulnerability Description
PACSgear MediaWriter 5.2.1 exposes a .NET Remoting TCP service on port 9000 via PacsgearMediaServerEngine.dll, registered with ObjectURIs RemoteObj and UIRemoteObj, without any authentication requirement. By exploiting the MarshalByRefObject object unmarshalling technique and implementing .NET WebClient class methods, an unauthenticated remote attacker can read and write arbitrary files on the host filesystem. The ObjectURIs are identical across all installations by default. Chaining the arbitrary file write primitive with DLL hijacking opportunities in the MediaWriter service (which runs as NT Authority\\SYSTEM and loads missing DLLs such as CRYPTBASE.DLL from the application directory) enables unauthenticated remote code execution as SYSTEM upon service restart.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Hyland PACSgear MediaWriter 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hyland PACSgear MediaWriter是美国Hyland公司的一款医疗影像数据刻录工具。 Hyland PACSgear MediaWriter 5.2.1版本存在安全漏洞，该漏洞源于通过PacsgearMediaServerEngine.dll公开的.NET Remoting TCP服务未设置身份验证，且在反序列化过程中利用MarshalByRefObject对象解组技术和.NET WebClient类方法，导致未经身份验证的远程攻击者可以读取和写入主机文件系统的任意文件，并进一步结合D
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
Hyland PACSgear MediaWriter 5.2.1 -

II. Public POCs for CVE-2026-58127

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III. Intelligence Information for CVE-2026-58127

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Proof of Concept for CVE-2026-58127 (1)

Vendor Pages for CVE-2026-58127 (1)

Other References for CVE-2026-58127 (1)

IV. Related Vulnerabilities

Same vendor: Hyland
Same weakness: CWE-306

V. Comments for CVE-2026-58127

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