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 prio…

EPSS: 0.830 (99.6th 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.