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CVE-2025-4727— Meteor livedata_server.js Object.assign redos

Quick assessment

Affected
n/a Meteor
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.

Meteor是Meteor开源的一个JavaScript应用平台。 Meteor 3.2.1及之前版本存在安全漏洞，该漏洞源于文件packages/ddp-server/livedata_server.js中函数Object.assign对参数forwardedFor的错误操作导致正则表达式复杂性不足。

CVSS 3.7 · Low EPSS 0.70% · P51

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-4727

Vulnerability Information
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Vulnerability Title
Meteor livedata_server.js Object.assign redos
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in Meteor up to 3.2.1 and classified as problematic. This issue affects the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to inefficient regular expression complexity. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.2 is able to address this issue. The identifier of the patch is f7ea6817b90952baaea9baace2a3b4366fee6a63. It is recommended to upgrade the affected component.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1333
Source: CVE Program / CVE List V5
Vulnerability Title
Meteor 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Meteor是Meteor开源的一个JavaScript应用平台。 Meteor 3.2.1及之前版本存在安全漏洞，该漏洞源于文件packages/ddp-server/livedata_server.js中函数Object.assign对参数forwardedFor的错误操作导致正则表达式复杂性不足。
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
- Meteor 3.2.0 -

II. Public POCs for CVE-2025-4727

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III. Intelligence Information for CVE-2025-4727

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Vendor Advisories for CVE-2025-4727 (1)

Same Patch Batch · n/a · 2025-05-15 · 13 CVEs total

CVE-2025-44181 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2025-44182 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2025-44180 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2025-44183 PHPGurukul Vehicle Record Management System 安全漏洞
CVE-2025-46052 webERP 安全漏洞
CVE-2025-46053 WebERP 安全漏洞
CVE-2025-44185 SourceCodester Best Employee Management System 安全漏洞
CVE-2024-52878 Insyde InsydeH2O kernel 安全漏洞
CVE-2024-52879 Insyde InsydeH2O kernel 安全漏洞
CVE-2024-52877 Insyde InsydeH2O kernel 安全漏洞
CVE-2024-52880 Insyde InsydeH2O kernel 安全漏洞
CVE-2025-44110 Fluxbb 安全漏洞

IV. Related Vulnerabilities

Same vendor: n/a
Same weakness: CWE-1333

V. Comments for CVE-2025-4727

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