CVE-2025-14847: MongoDB exploited

Advisory generated from the CVE record, CISA, Exploit Observer and VEDAS: what it is, whether it is exploited, who is affected, and how to fix and detect it.

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.

Description quoted from the CVE record (assigned by mongodb, published 2025-12-19).

Weakness: CWE-130: Improper Handling of Length Parameter Inconsistency

How it can be exploited

Exploitable over the network with low attack complexity with no special attack requirements needing no privileges and no user interaction. Impact: confidentiality high, integrity none, availability none. 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

CISA assessment (SSVC): CISA assesses exploitation as active. Automatable: yes. Technical impact: partial.

On CISA KEV since: 2025-12-29
US federal deadline: 2026-01-19
Ransomware use: Not known

Public exploit evidence (Exploit Observer)

Also known as: BDU:2025-16225, CNNVD-202512-3766, EUVD-2025-204529, GHSA-4742-mr57-2r9j

VEDAS cluster: VEDAS:AXIOMASTRAL

Exploit Observer links 45 pieces of public exploit code or detection modules that name this CVE or one of its aliases.

Exploit code and modules (45)

Code that names this CVE. A repository can be a working exploit, a scanner, a fake or malware; read it before running anything.

Metasploit module: https://www.rapid7.com/db/modules/auxiliary/scanner/mongodb/cve_2025_14847_mongobleed/
Nuclei template: https://raw.githubusercontent.com/projectdiscovery/nuclei-templates/main/javascript/cves/2025/CVE-2025-14847.yaml
Nuclei template: https://raw.githubusercontent.com/projectdiscovery/nuclei-templates/main/network/cves/2025/CVE-2025-14847.yaml
Code repository: https://github.com/0xblackash/cve-2025-14847
Code repository: https://github.com/0xredash/cve-2025-14847
Code repository: https://github.com/alexcyberx/cve-2025-14847_expolit
Code repository: https://github.com/amnnrth/cve-2025-14847
Code repository: https://github.com/ashwesker/ashwesker-cve-2025-14847
Code repository: https://github.com/cadgoose/mongobleed-cve-2025-14847-fully-automated-scanner
Code repository: https://github.com/chinaxploiter/cve-2025-14847-poc
Code repository: https://github.com/codeb0ssx/cve-2025-14847-poc
Code repository: https://github.com/cybertechajju/cve-2025-14847_expolit
and 33 more

Research and write-ups (9)

Research or write-up: https://horizon3.ai/attack-research/vulnerabilities/cve-2025-14847
Research or write-up: https://phoenix.security/mongobleed-vulnerability-cve-2025-14847
Research or write-up: https://unit42.paloaltonetworks.com/mongobleed-cve-2025-14847
Research or write-up: https://www.akamai.com/blog/security-research/2025/dec/cve-2025-14847-all-you-need-to-know-about-mongobleed
Research or write-up: https://www.akamai.com/blog/security-research/cve-2025-14847-all-you-need-to-know-about-mongobleed
Research or write-up: https://www.redhotcyber.com/en/post/critical-mongodb-vulnerability-exposed-cve-2025-14847
Research or write-up: https://www.smartkeyss.com/post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-2025-14847
Research or write-up: https://www.wiz.io/blog/mongobleed-cve-2025-14847-exploited-in-the-wild-mongodb
Research or write-up: https://www.wiz.io/blog/mongobleed-cve-2025-14847-exploited-in-the-wild-mongodb#update-december-31-2025-22

Vulnerability databases and vendor advisories (11)

Catalogue entries, not exploit evidence.

Vulnerability database or vendor advisory: https://euvd.enisa.europa.eu/enisa/EUVD-2025-204529
Vulnerability database or vendor advisory: https://github.com/advisories/GHSA-4742-mr57-2r9j
Vulnerability database or vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-14847
Vulnerability database or vendor advisory: https://osv.dev/vulnerability/UBUNTU-CVE-2025-14847
Vulnerability database or vendor advisory: https://redos.red-soft.ru/support/secure/uyazvimosti/uyazvimost-mongodb-org-cve-2025-14847-7.3/?sphrase_id=1455101
Vulnerability database or vendor advisory: https://ubuntu.com/security/CVE-2025-14847
Vulnerability database or vendor advisory: https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847
Vulnerability database or vendor advisory: https://www.cnnvd.org.cn/home/globalSearch?keyword=CNNVD-202512-3766
Vulnerability database or vendor advisory: https://www.tenable.com/cve/CVE-2025-14847
Vulnerability database or vendor advisory: https://www.vicarius.io/vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-server
Vulnerability database or vendor advisory: https://www.vicarius.io/vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb-server

News (4)

385 more references returned by Exploit Observer did not name this CVE or an alias, so they are left out.

VEDAS data as of 2026-11-01T17:12 UTC; fetched 2026-11-02.

Live scores

EPSS: 0.832
very likely to be attacked soon
VEDAS: 0.987
strong exploit evidence
On CISA KEV: Yes, since 2025-12-29
Detection rule: Nuclei · Suricata

EPSS (chance of attack)

VEDAS (exploit evidence)

Thin horizontal line: the “likely” (EPSS 0.10) or “strong” (VEDAS 0.90) threshold. Shaded “no data” areas are periods when cve-scores did not publish. The vertical line is the day CISA added it to its exploited list.

Who is affected

Product	Affected	Not affected
MongoDB Inc. MongoDB Server	from 8.2 before 8.2.3 from 8.0 before 8.0.17 from 7.0 before 7.0.28 from 6.0 before 6.0.27 from 5.0 before 5.0.32 from 4.4 before 4.4.30 version 4.2 version 4.0 and 1 more ranges	Not stated

Version ranges exactly as the CVE record states them. “Before X” means X is the first fixed version.

Exploit Observer also maps it to: mongodb mongodb, mongodb_inc. mongodb, ооо_«ред_софт» ред_ос.

How to fix it

Fixed versions stated in the CVE record: 8.2.3, 8.0.17, 7.0.28, 6.0.27, 5.0.32, 4.4.30.

CISA 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.

Vendor guidance:

How to detect it

Nuclei template (active check)

Zlib compressed protocol headers may - Vulnerability
Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by an unauthenticated client.

Name and description quoted from the template, written by VEDAS.

The template decides using dsl, regex, word matchers. Severity in the template: high. Marked as not yet verified against a live vulnerable target.

Run it against a host you own or are authorised to test:

bash

nuclei -u https://your-host -t CVE-2025-14847.yaml

Show the template (58 lines)

yaml

id: CVE-2025-14847

info:
  name: "Zlib compressed protocol headers may - Vulnerability"
  author: vedas-arpsyndicate
  severity: high
  description: |
    Mismatched length fields in Zlib compressed protocol headers may allow a read of uninitialized heap memory by
    an unauthenticated client.
  reference:
    - https://www.exploit.observer/?keyword=CVE-2025-14847&match=exact
    - https://subdomain.center/?engine=ammonites&keyword=mongodb&match=exact
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2025-14847
    cwe-id: CWE-908
  metadata:
    verified: false
  tags: cve,cve2025,mongodb,memory-leak,network,mongobleed,kev,vkev,vuln
tcp:
  - inputs:
      - data: 3b0000003c300000ffffffffd40700000000000061646d696e2e24636d640000000000ffffffff14000000106275696c64696e666f000100000000
        type: hex
    host:
      - "{{Hostname}}"
    port: 27017
    read-size: 2048

    matchers-condition: and
    matchers:
      - type: word
        part: raw
        words:
          - "version"
          - "gitVersion"
        condition: and

      - type: dsl
        dsl:
          - "compare_versions(version, '>= 8.2.0') && compare_versions(version, '<= 8.2.2')"
          - "compare_versions(version, '>= 8.0.0') && compare_versions(version, '<= 8.0.16')"
          - "compare_versions(version, '>= 7.0.0') && compare_versions(version, '<= 7.0.27')"
          - "compare_versions(version, '>= 6.0.0') && compare_versions(version, '<= 6.0.26')"
          - "compare_versions(version, '>= 5.0.0') && compare_versions(version, '<= 5.0.31')"
          - "compare_versions(version, '>= 4.4.0') && compare_versions(version, '<= 4.4.29')"
          - "compare_versions(version, '>= 4.2.0') && compare_versions(version, '<= 4.2.25')"
          - "compare_versions(version, '>= 4.0.0') && compare_versions(version, '<= 4.0.28')"
          - "compare_versions(version, '>= 3.6.0') && compare_versions(version, '<= 3.6.23')"
        condition: or

    extractors:
      - type: regex
        name: version
        part: raw
        group: 1
        regex:
          - '(?s)version.{0,50}?([0-9]+\.[0-9]+\.[0-9]+)'

CVE-2025-14847.yaml on GitHub

Suricata rules (network detection)

1 rule that alert on traffic matching this exploit: VEDAS CVE-2025-14847 Zlib compressed protocol headers may - Vulnerability. Add them to your Suricata rule set and reload.

Show the rules

suricata

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"VEDAS CVE-2025-14847 Zlib compressed protocol headers may - Vulnerability"; flow:established,to_server; content:"3b0000003c300000ffffffffd40700000000000061646d696e2e24636d64"; nocase; fast_pattern; classtype:attempted-admin; reference:cve,CVE-2025-14847; reference:url,https://www.exploit.observer/?keyword=CVE-2025-14847&match=exact; reference:url,https://subdomain.center/?engine=ammonites&keyword=mongodb&match=exact; sid:1011483; rev:1;)

CVE-2025-14847.rules on GitHub

Advisories on this CVE

MongoBleed (CVE-2025-14847) (29 Dec 2025)

References

Government sources

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847 (government-resource)

Other references

Other databases

Where this comes from

This advisory is generated automatically by VEDAS from: CVE.org record, CISA KEV, cve-scores (EPSS and VEDAS), Exploit Observer, vedas-signatures. Text in quotes is reproduced from the source; everything else is a fixed template filled with source fields. Nothing here is written by a language model. Check the vendor advisory before acting, and read how VEDAS and Exploit Observer work, and their limits.