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Known exploited vulnerability

CVE-2025-14847

highCVSS 4.0 8.7In CISA KEVEPSS 83%Published · MongoDB Inc.

The short answer

CVE-2025-14847 affects MongoDB Inc. MongoDB Server and is rated high (CVSS 8.7). CISA added it to the Known Exploited Vulnerabilities catalog on 2025-12-29: attackers are using it, so patch it first. The vendor has linked a patch.

What it is

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.

Weakness: CWE-130.

Severity

8.7 high

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Exploited (CISA KEV)

Yes, since Dec 29, 2025

Federal due date Jan 19, 2026

EPSS, next 30 days

83%

Higher than 100% of scored CVEs

How it can be exploited

Attack vector
Network
Attack complexity
Low
Attack requirements
None
Privileges required
None
User interaction
None
Confidentiality impact
High
Integrity impact
None
Availability impact
None

What CISA says to do

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

Affected products

MongoDB Server. NVD's record lists the exact affected versions.

References

Questions

Is CVE-2025-14847 being exploited?

Yes. CISA added CVE-2025-14847 to its Known Exploited Vulnerabilities catalog on 2025-12-29, with a federal remediation due date of 2026-01-19.

How do I fix CVE-2025-14847?

CISA's 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.

From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.

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