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Full vulnerability report · 2025
CVE-2025-14847High confidence

MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

MongoDB · MongoDB and MongoDB Server

8.7HighCVSS 4.0
Recommended action
Patch now

CISA confirms exploitation in the wild and lists 2026-01-19 as the remediation due date.

Patch available
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
9AKK108472A9037 · CSAF 2.0 · revision 1 · finalABB Product Security Incident Response Team (PSIRT)ABB AbilityTM zenon Security Risk Due to End-of-Life MongoDB Component
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • IIoT services with MongoDB 4.2 installed on ABB Ability Zenon /all
Summary
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.
Remediation
ABB recommends the following mitigation measures: - Replace bundled MongoDB with a supported version if IIoT services are required: - Where IIoT functionality is required, the bundled MongoDB instance can be replaced with a supported and patched version through manual configuration. - The following zenon online help section explains the process of installing and using your own MongoDB database: zenHelpViewer - Uninstall IIoT Services wherever it’s not required: - If IIoT Services are not required, they can be removed using the Control panel uninstaller. This eliminates the dependency on MongoDB without affecting other zenon components. Refer to section “General security recommendations” for further advise on how to keep your system secure.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Select the national-authority views to include. The exact source language is shown on each matched advisory. Your choice is remembered on this device and encoded in the shareable URL.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-204529

CISA KEV mirrored by ENISA

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.

EUVD state
Present in the current official mapping
Known exploitation
Recorded by ENISA since 29 Dec 2025. Evidence sources: cisa_kev.
ENISA score
8.7 · CVSS 4.0
Advisory evidence
2 linked advisory records
Explicit mitigation evidence

Only statements that explicitly mention a fix, patch, update, workaround or mitigation are shown here.

  • csaf_ncscnl · NCSC-2025-0402Kwetsbaarheid verholpen in MongoDB
Recommended actionPatch now

CISA confirms exploitation in the wild and lists 2026-01-19 as the remediation due date.

Patch available
01

What, why and how

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.

What

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.

Why

The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

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.

Why

The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Confirmed in the wild

CISA added this CVE to its Known Exploited Vulnerabilities catalogue on 2025-12-29.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
Reference recorded

A structured CVE source labels at least one public reference as exploit material. BlackTree has not independently validated that it is safe, reliable or weaponised.

Likely attack path
a network path → Improper Handling of Length Parameter Inconsistency → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-130 ↗

CWE-130: Improper Handling of Length Parameter Inconsistency. The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
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

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VINoneVulnerable-system integrity: No direct loss is represented by this metric.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-130CISA KEVPublic exploit reference
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2025-204529Known-exploited evidence recorded

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.

Official EUVD record ↗
BSI · German · WID-SEC-2025-2905MongoDB: Schwachstelle ermöglicht Offenlegung von Informationen

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in MongoDB ausnutzen, um Informationen offenzulegen.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV26-120Commvault security advisory (AV26-120)

On February 10, 2026, Commvault published security advisories to address vulnerabilities in the following products:

Official advisory ↗
Canadian Centre for Cyber Security · English · AL25-021AL25-021 - Vulnerability affecting MongoDB - CVE-2025-14847

An Alert is used to raise awareness of a recently identified cyber threat that may impact cyber information assets, and to provide additional detection and mitigation advice to recipients. The Canadian Centre for Cyber Security ("Cyber Centre") is also available to provide additional assistance regarding the content of this Alert to recipients as requested.

Official advisory ↗
Canadian Centre for Cyber Security · English · AV25-862MongoDB security advisory (AV25-862) - Update 1

On December 15, 2025, MongoDB published a security advisory to address a vulnerability in the following products: On December 29, 2025, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2025-14847 to their Known Exploited Vulnerabilities (KEV) Database.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0395Multiples vulnérabilités dans les produits IBM

CVERecord?id=CVE-2024-50379 Référence CVE CVE-2024-52316 https://www.cve.org/CVERecord?id=CVE-2024-52316 Référence CVE CVE-2024-52317 https://www.cve.org/CVERecord?id=CVE-2024-52317 Référence CVE CVE-2024-5629 https://www.cve.org/CVERecord?id=CVE-2024-5629 Référence CVE CVE-2024-56337 https://www.cve.org/CVERecord?id=CVE-2024-56337 Référence CVE CVE-2024-6232 https://www.cve.org/CVERecord?id=CVE-2024-6232 Référence CVE CVE-2024-6923 https://www.cve.org/CVERecord?id=CVE-2024-6923 Référence CVE CVE-2024-8088 https://www.cve.org/CVERecord?id=CVE-2024-8088 Référence CVE CVE-2025-12818 https://www.cve.org/CVERecord?id=CVE-2025-12818 Référence CVE CVE-2025-14847 https://www.cve.org/CVERecord?id=CVE-2025-14847 Référence CVE CVE-2025-24813 https://www.cve.org/CVERecord?id=CVE-2025-24813 Référence CVE CVE-2025-31650 https://www.cve.org/CVERecord?id=CVE-2025-31650 Référence CVE CVE-2025-31651 https://www.cve.org/CVERecord?id=CVE-2025-31651 Référence CVE CVE-2025-38129 https://www.cve.org/CVERecord?id=CVE-2025-38129 Référence CVE CVE-2025-38248 https://www.cve.org/CVERecord?id=CVE-2025-38248 Référence CVE CVE-2025-40064 https://www.cve.org/CVERecord?id=CVE-2025-40064 Référence CVE CVE-2025-49124 https://www.cve.org/CVERecord?id=CVE-2025-49124 Référence CVE CVE-2025-50181 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0224Multiples vulnérabilités dans les produits IBM

com/support/pages/node/7261887 Bulletin de sécurité IBM 7261890 du 25 février 2026 https://www.ibm.com/support/pages/node/7261890 Bulletin de sécurité IBM 7261935 du 26 février 2026 https://www.ibm.com/support/pages/node/7261935 Bulletin de sécurité IBM 7261959 du 26 février 2026 https://www.ibm.com/support/pages/node/7261959 Référence CVE CVE-2023-53673 https://www.cve.org/CVERecord?id=CVE-2023-53673 Référence CVE CVE-2024-29371 https://www.cve.org/CVERecord?id=CVE-2024-29371 Référence CVE CVE-2025-12816 https://www.cve.org/CVERecord?id=CVE-2025-12816 Référence CVE CVE-2025-13601 https://www.cve.org/CVERecord?id=CVE-2025-13601 Référence CVE CVE-2025-14847 https://www.cve.org/CVERecord?id=CVE-2025-14847 Référence CVE CVE-2025-15284 https://www.cve.org/CVERecord?id=CVE-2025-15284 Référence CVE CVE-2025-39993 https://www.cve.org/CVERecord?id=CVE-2025-39993 Référence CVE CVE-2025-40154 https://www.cve.org/CVERecord?id=CVE-2025-40154 Référence CVE CVE-2025-40240 https://www.cve.org/CVERecord?id=CVE-2025-40240 Référence CVE CVE-2025-40248 https://www.cve.org/CVERecord?id=CVE-2025-40248 Référence CVE CVE-2025-40277 https://www.cve.org/CVERecord?id=CVE-2025-40277 Référence CVE CVE-2025-61140 https://www.cve.org/CVERecord?id=CVE-2025-61140 Référence CVE CVE-2025-64756 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0102Vulnérabilité dans Splunk Enterprise

Une vulnérabilité a été découverte dans Splunk Enterprise. Elle permet à un attaquant de provoquer un problème de sécurité non spécifié par l'éditeur.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0087Vulnérabilité dans les produits Belden

Une vulnérabilité a été découverte dans les produits Belden. Elle permet à un attaquant de provoquer une atteinte à la confidentialité des données.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0061Multiples vulnérabilités dans les produits IBM

De multiples vulnérabilités ont été découvertes dans les produits IBM. Elles permettent à un attaquant de provoquer un contournement de la politique de sécurité et un problème de sécurité non spécifié par l'éditeur.

Official advisory ↗
CERT-FR · French · CERTFR-2025-AVI-1134Multiples vulnérabilités dans MongoDB Server

De multiples vulnérabilités ont été découvertes dans MongoDB Server. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à la confidentialité des données et une atteinte à l'intégrité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2025-023931MongoDB Inc.のMongoDBにおけるレングスパラメーターの不整合による処理に関する脆弱性

Zlibで圧縮されたプロトコルヘッダーにおける長さフィールドの不一致が原因で、認証されていないクライアントが初期化されていないヒープメモリを読み取る可能性があります。この問題は、MongoDB Server v7.0の7.0.28未満のすべてのバージョン、MongoDB Server v8.0の8.0.17未満のバージョン、MongoDB Server v8.2の8.2.3未満のバージョン、MongoDB Server v6.0の6.0.27未満のバージョン、MongoDB Server v5.0の5.0.32未満のバージョン、MongoDB Server v4.4の4.4.30未満のバージョン、ならびにMongoDB Server v4.2以降、v4.0以降、およびv3.6以降のバージョンにも影響します。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6656美 CISA 발표 주요 Exploit 정보공유(Update. 2025-12-29)

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.

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6655MongoDB 제품 보안 업데이트 권고

MongoDB에서 발생하는 초기화되지 않은 힙 메모리 반환 취약점(CVE-2025-14847) [1][2]

Official advisory ↗
NCSC-NL · Dutch · NCSC-2025-0402Kwetsbaarheid verholpen in MongoDB

De kwetsbaarheid met kenmerk CVE-2025-14847 stelt een ongeauthenticeerde aanvaller op afstand in staat om ongeïnitialiseerd heapgeheugen uit te lezen. De oorzaak ligt in het onjuist verwerken van lengteparameters in Zlib-gecomprimeerde protocolheaders. Misbruik van de kwetsbaarheid kan leiden tot het lekken van gevoelige informatie uit het heapgeheugen, wat door een aanvaller kan worden ingezet om verdere aanvallen op het systeem uit te voeren Onderzoekers hebben een exploit gepubliceerd waarmee CVE-2025-14847 kan worden misbruikt. Het NCSC verwacht op korte termijn actief misbruik van de kwetsbaarheid.

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
IIoT services with MongoDB 4.2 installed on ABB Ability Zenon /all
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
ABB recommends the following mitigation measures: - Replace bundled MongoDB with a supported version if IIoT services are required: - Where IIoT functionality is required, the bundled MongoDB instance can be replaced with a supported and patched version through manual configuration. - The following zenon online help section explains the process of installing and using your own MongoDB database: zenHelpViewer - Uninstall IIoT Services wherever it’s not required: - If IIoT Services are not required, they can be removed using the Control panel uninstaller. This eliminates the dependency on MongoDB without affecting other zenon components. Refer to section “General security recommendations” for further advise on how to keep your system secure.
04

Evidence and provenance

Published 19 Dec 2025 · Last source change 26 Feb 2026, 16:07 UTC · CWE-130 · Improper Handling of Length Parameter Inconsistency

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-204529
Product sourceVendor CSAF · ABB Product Security Incident Response Team (PSIRT)
Remediation sourceVendor CSAF · ABB Product Security Incident Response Team (PSIRT)
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    8.2 < 8.2.3; 8.0 < 8.0.17; 7.0 < 7.0.28; 6.0 < 6.0.27; 5.0 < 5.0.32; 4.4 < 4.4.30; 4.2; 4.0 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    After
    MongoDB Server: 8.2 < 8.2.3, 8.0 < 8.0.17, 7.0 < 7.0.28, 6.0 < 6.0.27, 5.0 < 5.0.32, 4.4 < 4.4.30, 4.2, 4.0, 3.6 · Fixed: An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
    CNA ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from authoritative remediation link to authoritative remediation link.
    Before
    authoritative remediation link
    After
    authoritative remediation link
    ABB Product Security Incident Response Team (PSIRT) ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Added to CISA KEV
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2025-204529↗Vendor CSAF · ABB Product Security Incident Response Team (PSIRT)↗CISA KEV record↗CVE authority or vendor reference↗Public exploit reference↗Public exploit reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-14847 · cve.blacktree.nl