CVE-2025-4727

Name: CVE-2025-4727
Creator: NVD / NIST
Published: 2025-05-15T23:15:59.47+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.59%

Last modified Jun 17, 2026

CVE-2025-4727 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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. EPSS estimates a 0.59% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

3.7/10

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

CVSS 4.0

6.3/10

CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.59%

43.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Meteor	Meteor	< 3.2.2

References

https://github.com/meteor/meteor/commit/f7ea6817b90952baaea9baace2a3b4366fee6a63Issue Tracking, Patch
https://github.com/meteor/meteor/issues/13713Broken Link
https://github.com/meteor/meteor/pull/13721Issue Tracking, Patch
https://github.com/meteor/meteor/releases/tag/release/METEOR%403.2.2Release Notes
https://vuldb.com/?ctiid.309029Permissions Required, VDB Entry
https://vuldb.com/?id.309029Third Party Advisory, VDB Entry
https://vuldb.com/?submit.570441Exploit, Third Party Advisory, VDB Entry
https://vuldb.com/?submit.570441Exploit, Third Party Advisory, VDB Entry

Timeline

Published: May 15, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-4727?

How severe is CVE-2025-4727?

CVE-2025-4727 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.59% probability of exploitation in the next 30 days.

How do I fix CVE-2025-4727?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-4727?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST