Background exploitation KEV catalog No authentication

CVE-2025-14847

MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

CheckOps priority index

8.4/10 Patch within 24 h

Severity8.7

Probability8.3

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 83.2% higher than 99.7% of CVEs

CVSS 4.0 8.7 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/

Exploited for 309 days 29 Dec 2025

CISA due date 19 Jan 2026 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)29 Dec 2025
Exploited in EUVD (ENISA)29 Dec 2025
Used by ransomwareno
EPSS above 10 %83.2%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

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

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

MongoDB ServerMongoDB and MongoDB Server

Affected versions

8.0 <8.0.17
4.0
4.2
3.6
7.0 <7.0.28
8.2 <8.2.3
6.0 <6.0.27
5.0 <5.0.32
4.4 <4.4.30

Weaknesses (CWE)

CWE-130

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

19 Dec 2025
Published
29 Dec 2025
Exploitation reported (ENISA)
29 Dec 2025
Added to the KEV catalog
19 Jan 2026
CISA remediation due date
25 Sept 2026
EPSS peak: 83.2%

References

Other exploited vulnerabilities from the same vendor

CVE-2019-10758MongoDB mongo-express Remote Code Execution Vulnerability
8.3 · Background exploitation