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Exploited vulnerability · CISA KEV

Is CVE-2025-14847 exploited? Yes: in CISA KEV since 29 Dec 2025

Gociux · MongoDB and MongoDB Server · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2025-14847, MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 29 Dec 2025, 10 days after it was published. It affects MongoDB and MongoDB Server. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 29 Dec 2025
ransomwareNot knownno confirmed use
EPSStop 1%among the most likely CVEs to be exploited
severity7.5CVSS 3.1 · high
US federal due19 Jan 2026BOD 22-01 deadline

What it is

MongoDB Server contains an improper handling of length parameter inconsistency vulnerability in Zlib compressed protocol headers. This vulnerability may allow a read of uninitialized heap memory by an unauthenticated client.

VendorMongoDB (2 exploited CVEs in KEV)
ProductMongoDB and MongoDB Server
VulnerabilityMongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
WeaknessCWE-130
Published19 Dec 2025
Added to KEV29 Dec 2025
Reported by (CNA)mongodb

What to do

  1. Check whether you run it. Look for MongoDB and MongoDB Server in your asset inventory, including appliances and cloud images. Stack check lists every exploited MongoDB CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 19 Dec 2025.
  4. Get told next time. Email alerts when CISA adds a CVE for MongoDB.

References

Questions

Is CVE-2025-14847 being exploited?

Yes. CISA added CVE-2025-14847 to the Known Exploited Vulnerabilities catalog on 29 Dec 2025, which means there is reliable evidence of exploitation in the wild.

Is CVE-2025-14847 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2025-14847?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check MongoDB's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected MongoDB and MongoDB Server and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in December 2025 · MongoDB scorecard · act-now radar.

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