What is CVE-2025-14847?

CVE-2025-14847 is a high-severity vulnerability in MongoDB, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 7.5/10. Published 2025-12-19.

How severe is CVE-2025-14847?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-14847 known to be exploited?

Yes. CVE-2025-14847 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-29), indicating it is being actively exploited. 43 public proof-of-concept repositories are indexed.

Vulnerability in MongoDB

CVE-2025-14847

Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client. This issue affects all MongoDB Server v7.0 prior to 7.0.28 versions, MongoDB Server v8.0 versions prior to 8.0.17, MongoDB Server v8.2 versions prior to 8.2.3, MongoDB Server v6.0 versions prior to 6.0.27, MongoDB Server v5.0 versions prior to 5.0.32, MongoDB Server v4.4 versions prior to 4.4.30, MongoDB Server v4.2 versions greater than or equal to 4.2.0, MongoDB Server v4.0 versions greater than or equal to 4.0.0, and MongoDB Server v3.6 versions greater than or equal to 3.6.0.

EPSS: 0.832 (99.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Mongodb
Mongodb Inc. Server — versions 8.2, 8.0, 7.0

Weakness classification (CWE)

CWE-130 — Improper Handling of Length Parameter Inconsistency

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2025-12-29. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-01-19.

Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Public proof-of-concept exploits

References

cna@mongodb.com (Patch, Issue Tracking, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List)
af854a3a-2127-422b-91ae-364da2661108 (Technical Description, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (Third Party Advisory, US Government Resource)

Frequently asked questions

What is CVE-2025-14847?: CVE-2025-14847 is a high-severity vulnerability in MongoDB, classified under Improper Handling of Length Parameter Inconsistency. CVSS score: 7.5/10. Published 2025-12-19.
How severe is CVE-2025-14847?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-14847 known to be exploited?: Yes. CVE-2025-14847 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-12-29), indicating it is being actively exploited. 43 public proof-of-concept repositories are indexed.