Meteor up to 3.2.1 livedata_server.js Object.assign forwardedFor redos

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.5$0-$5k0.93

Summaryinfo

A vulnerability was found in Meteor up to 3.2.1. It has been rated as problematic. The affected element is the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to redos. This vulnerability is traded as CVE-2025-4727. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. Upgrading the affected component is advised.

Detailsinfo

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 with an unknown input leads to a redos vulnerability. Using CWE to declare the problem leads to CWE-1333. The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles. Impacted is availability.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2025-4727. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known. MITRE ATT&CK project uses the attack technique T1449.003 for this issue.

It is declared as proof-of-concept.

Upgrading to version 3.2.2 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch f7ea6817b90952baaea9baace2a3b4366fee6a63 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-15378). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.7
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.7
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 3.7
CNA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Redos
CWE: CWE-1333 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Meteor 3.2.2
Patch: f7ea6817b90952baaea9baace2a3b4366fee6a63

Timelineinfo

05/15/2025 Advisory disclosed
05/15/2025 +0 days VulDB entry created
06/23/2025 +39 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 13713
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2025-4727 (🔒)
GCVE (CVE): GCVE-0-2025-4727
GCVE (VulDB): GCVE-100-309029
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/15/2025 09:18
Updated: 06/23/2025 17:47
Changes: 05/15/2025 09:18 (61), 05/16/2025 03:37 (1), 05/16/2025 11:43 (30), 06/23/2025 17:47 (1)
Complete: 🔍
Submitter: DayShift
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #570441: meteor https://www.meteor.com/ <=3.2.1 Inefficient Regular Expression Complexity (by DayShift)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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