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 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.
do firstUpgrade to a fixed release: 4.4.30, 5.0.32, 6.0.27, 7.0.28 (+2 more below).
Can a WAF block it? No. The vulnerability is triggered by a malformed Zlib compressed protocol header sent to the MongoDB server, which is not an HTTP-based protocol. Therefore, a web application firewall cannot filter or block these attacks.
Also consider: patch
Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.
Is CVE-2025-14847 being exploited?
Yes. CVE-2025-14847 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.
How severe is CVE-2025-14847?
CVE-2025-14847 is rated High with a CVSS score of 7.5. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-14847?
Yes. A fix has been recorded for CVE-2025-14847. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-14847 affect?
CVE-2025-14847 affects mongodb:mongodb. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
- affected>= 4.4.0 and < 4.4.30
- affected>= 5.0.0 and < 5.0.32
- affected>= 6.0.0 and < 6.0.27
- affected>= 7.0.0 and < 7.0.28
- affected>= 8.0.0 and < 8.0.17
- affected>= 8.2.0 and < 8.2.3
- affected>= 8.2 and < 8.2.3
- affected>= 8.0 and < 8.0.17
- affected>= 7.0 and < 7.0.28
- affected>= 6.0 and < 6.0.27
- affected>= 5.0 and < 5.0.32
- affected>= 4.4 and < 4.4.30
- affected4.2
- affected4.0
- affected3.6
As published in the CVE Program record, and, for products that ship the affected component, in the advisory named beside them. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
public exploits
Unvetted proof-of-concept code on GitHub: 1 Metasploit module · 42 GitHub proofs of concept · 1 Nuclei template
- auxiliary/scanner/mongodb/cve_2025_14847_mongobleed · auxiliary · normal
- MongoDB Server - Information Disclosure (MongoBleed) · detection template · high
- Black1hp/mongobleed-scanner · 36 ★
- cybertechajju/CVE-2025-14847_Expolit · 35 ★
- ProbiusOfficial/CVE-2025-14847 · 27 ★
- onewinner/CVE-2025-14847 · 15 ★
Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.
cisa ssvc
- exploitation
- active
- automatable
- yes
- technical impact
- partial
Assessed by CISA 30 Dec 2025 (SSVC 2.0.3).
timeline
- 30 Jul 2025First proof-of-concept repository on GitHub (unvetted)
- 19 Dec 2025Published · 142 days (about 5 months) later
- 29 Dec 2025Added to CISA KEV (exploited in the wild) · 10 days later
- 30 Dec 2025CISA SSVC assessment: exploitation active · 1 day later
- 19 Jan 2026CISA remediation due date (US federal agencies) · 20 days later
- 26 Feb 2026CVE record last updated · 39 days later
- 2 Nov 2026Analysed by vulneraibility.com · 249 days (about 8 months) later
- Linkjira.mongodb.org /browse/SERVER-115508
- Linkcisa.gov /known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-14847
- Linkopenwall.com /lists/oss-security/2025/12/29/21
- Linkvicarius.io /vsociety/posts/cve-2025-14847-detection-script-heap-memory-exposure-in-mongodb-
- Linkvicarius.io /vsociety/posts/cve-2025-14847-mitigation-script-heap-memory-exposure-in-mongodb
- Linksmartkeyss.com /post/mongobleed-pre-auth-memory-disclosure-via-op_compressed-in-mongodb-cve-202
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA KEV catalog: exploitation, date added, due date
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Metasploit Framework: exploit and scanner modules
- Nuclei templates: detection templates
- PoC-in-GitHub: GitHub repositories that claim a proof of concept
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.