CVE-2025-4727: A vulnerability was found in Meteor up to 3.2.1 and classified as problematic

Q: How do I fix CVE-2025-4727?

meteor: upgrade to 3.2.2. Exact commands for each OS are on this page.

Q: Is CVE-2025-4727 being exploited?

CVE-2025-4727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-4727 affect?

CVE-2025-4727 affects meteor. Severity is low (CVSS 3.7). 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 ineffici

Q: How urgent is CVE-2025-4727?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

This week

LOW 3.7REMOTEUPGRADE

CVE-2025-4727 is a low-severity flaw (CVSS 3.7) affecting meteor. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 m

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.9% (top 40%)
CISA exploited list	No
Weakness	CWE-400, CWE-1333
Published	2025-05-15
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: meteor

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-05-15 23:15 UTCPublished CVE record published
2026-06-17 09:33 UTCUpdated Record last modified

meteor meteor UPGRADE

Affected: < 3.2.2

Fixed in: 3.2.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy meteor || rpm -q meteor || meteor --version

2. UPGRADE to 3.2.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade meteor

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade meteor

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-4727?

meteor: upgrade to 3.2.2. Exact commands for each OS are on this page.

Is CVE-2025-4727 being exploited?

CVE-2025-4727 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-4727 affect?

CVE-2025-4727 affects meteor. Severity is low (CVSS 3.7). 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 ineffici

How urgent is CVE-2025-4727?

Priority 38/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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