How severe is CVE-2025-4727?

CVE-2025-4727 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2025-4727 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4727?

CVE-2025-4727 affects Meteor. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4727?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4727 have an EU (EUVD) identifier?

Yes. CVE-2025-4727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15378.

When was CVE-2025-4727 published?

CVE-2025-4727 was published on 2025-05-15 and last updated on 2026-06-17.

CVE-2025-4727

CVE-2025-4727 is a low-severity vulnerability in Meteor with a CVSS 3.x base score of 3.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Low (CVSS 3.x base score 3.7)
CVSS v2: 2.6
CVSS v4: 6.3
EPSS exploit prediction: 1% (44th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-15378
Weakness: CWE-400
Affected product: Meteor
Published: 2025-05-15
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-4727?: 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.
How severe is CVE-2025-4727?: CVE-2025-4727 has a CVSS 3.x base score of 3.7, rated low severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2025-4727 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (44th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4727?: CVE-2025-4727 affects Meteor. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4727?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4727 have an EU (EUVD) identifier?: Yes. CVE-2025-4727 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-15378.
When was CVE-2025-4727 published?: CVE-2025-4727 was published on 2025-05-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:meteor:meteor:*:*:*:*:*:*:*:*

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