CASCACascade Atlas

Evidence dossier

CVE-2025-14847

Zlib compressed protocol header length confusion may allow memory read

Exploited in the wild (CISA KEV since Dec 29, 2025). mongodb reports CVSS 4.0 8.7. EPSS estimates 83.2% exploit likelihood as of Aug 26, 2026.

82.6–84.2Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

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.

State
PUBLISHED
Published
Dec 19, 2025
Updated
Feb 26, 2026
Evidence coverage
97%

Evidence chronology

What was known when

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  1. Source dateSource date omittedFirst observed by CASCA
    CISA-ADP

    Record text: CISA ADP Vulnrichment

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    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    CVE Program

    Record text: CVE Program Container

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    Field
    container
    Value
    CVE Program Container
    Original evidence ↗
  3. Source dateSource date omittedFirst observed by CASCA
    mongodb

    Record text: Zlib compressed protocol header length confusion may allow memory read

    Inspect raw assertion
    Field
    container
    Value
    Zlib compressed protocol header length confusion may allow memory read
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
    Original evidence ↗
  5. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 83.22% probability · 99.65th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.832180000000; percentile 0.996540000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Dec 29, 2025 · first observed Jul 19, 2026

Exploit likelihood83.22%

FIRST EPSS · score date Aug 26, 2026 · 99.7th percentile · first observed Aug 26, 2026

SeverityCVSS 8.7

mongodb · CVSS 4.0 · first observed Jul 19, 2026 · same-version scores align in this snapshot

Evidence detail

Source limits and decisions

Why each evidence state has this value

casca-unknown-reasons-v1
Exploitation statusEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Exploit likelihoodEvidence supported

Eligible evidence is present for this bounded claim.

Revision
evidence-policy-v1.1.0
Cutoff
Aug 27, 2026
Resolution
None
Severity assessmentEvidence supported

Eligible evidence is present for this bounded claim.

Revision
casca-direct-cvss-eligibility-v1
Cutoff
Aug 27, 2026
Resolution
None
Affected productsSource-reported scope

The cited source assertion is retained while canonical product linkage remains open.

Revision
casca-factor-d-obligations-v1
Cutoff
Aug 27, 2026
Resolution
Resolve identity

Source comparison

Who said what

CISA-ADPIndependent enrichment
Record text

CISA ADP Vulnrichment

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Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CVE ProgramDerivative copy
Record text

CVE Program Container

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Field
container
Value
CVE Program Container
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
mongodbOriginal assertion
Record text

Zlib compressed protocol header length confusion may allow memory read

Inspect raw assertion
Field
container
Value
Zlib compressed protocol header length confusion may allow memory read
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
MongoDB and MongoDB Server Improper Handling of Length Parameter Inconsistency Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

83.22% probability · 99.65th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.832180000000; percentile 0.996540000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
6Underlying assertions
1Canonical products
6Target assertions
0Constraint assertions

Grouped from 1 configuration nodes in this exact snapshot. Visual grouping is navigational; asset exposure and root cause require cited evidence.

Identity source boundaries
  • Cpe dictionary1,775,266 records · observed through 2026-07-21T06:45:29.809Z27d65b0f-b718-4b4f-bb79-c47c68d09dfa
  • Cpe match643,502 records · observed through 2026-07-21T08:13:17.697Z955dae73-7302-438b-aee1-058d7cc5d48e

2 scope groups

mongodb · source assertedMongoDB Inc.MongoDB ServerDirect source scope
Affected: 8.2 to before 8.2.3 (custom comparison)Affected: 8.0 to before 8.0.17 (custom comparison)Affected: 7.0 to before 7.0.28 (custom comparison)Affected: 6.0 to before 6.0.27 (custom comparison)Affected: 5.0 to before 5.0.32 (custom comparison)Affected: 4.4 to before 4.4.30 (custom comparison)Affected: 4.2 (custom comparison)Affected: 4.0 (custom comparison)Affected: 3.6 (custom comparison)
Source-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Inspect raw assertion[{"status": "affected", "version": "8.2", "lessThan": "8.2.3", "versionType": "custom"}, {"status": "affected", "version": "8.0", "lessThan": "8.0.17", "versionType": "custom"}, {"status": "affected", "version": "7.0", "lessThan": "7.0.28", "versionType": "custom"}, {"status": "affected", "version": "6.0", "lessThan": "6.0.27", "versionType": "custom"}, {"status": "affected", "version": "5.0", "lessThan": "5.0.32", "versionType": "custom"}, {"status": "affected", "version": "4.4", "lessThan": "4.4.30", "versionType": "custom"}, {"status": "affected", "version": "4.2", "versionType": "custom"}, {"status": "affected", "version": "4.0", "versionType": "custom"}, {"status": "affected", "version": "3.6", "versionType": "custom"}]
NVD CPE · APPLICATIONmongodbmongodbVulnerable target · 6 assertions
Any version (unconstrained) (>= 3.6.0, < 4.4.30); Any version (unconstrained) (>= 5.0.0, < 5.0.32); Any version (unconstrained) (>= 6.0.0, < 6.0.27); Any version (unconstrained) (>= 7.0.0, < 7.0.28); Any version (unconstrained) (>= 8.0.0, < 8.0.17); Any version (unconstrained) (>= 8.2.0, < 8.2.3)Canonical identity product-3ca420f6690a2f629a35a42c4c6ee8d889749f4de6e5cc5618ff98752093760dLinked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 3
    Logic
    OR
    Version bounds
    from including 7.0.0; through excluding 7.0.28
    Match ID
    5c9277bb-90fc-4a57-9028-dd57322f1d44
  2. cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 2
    Logic
    OR
    Version bounds
    from including 6.0.0; through excluding 6.0.27
    Match ID
    41ecb5ab-e6d0-412e-802f-839d53076677
  3. cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    from including 5.0.0; through excluding 5.0.32
    Match ID
    ccd1eb22-51ea-4abc-9e0b-99520670133b
  4. cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 4
    Logic
    OR
    Version bounds
    from including 8.0.0; through excluding 8.0.17
    Match ID
    2f4d674d-cbc0-4412-af68-6fed8a6394c3
  5. cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 3.6.0; through excluding 4.4.30
    Match ID
    2fcc5203-4e5e-4b2b-86a1-fd47a097013c
  6. cpe:2.3:a:mongodb:mongodb:*:*:*:*:-:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 5
    Logic
    OR
    Version bounds
    from including 8.2.0; through excluding 8.2.3
    Match ID
    4302991b-e6cf-4e7b-9b24-bd2355c6f393

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-6d5fee571212725fd07351dbc0be12d4bc0ddd7662716d9d101be3397fdddd8a · product-3ca420f6690a2f629a35a42c4c6ee8d889749f4de6e5cc5618ff98752093760d

Source class
Nvd cpe vulnerable target
Assertions
6
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
302a38c7-5e30-42f3-a5b6-6c90234c9fdd50caa693-5744-4250-8a13-3b74c6231dea91529c32-4e8f-4139-a5bb-009c11d6c69793003503-b6d6-47f5-9f99-cb5684b90864ade20a3e-f76e-40d2-abf0-3bb71c64993beddb870b-478a-40d3-9a17-884aa83bc336
Source-reported scopeSource-reported scope

Canonical linkage remains open; the cited source assertion is retained below.

Vendor specified only by source · Product specified only by source

Source class
Direct cve affected
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
ceee767f-f159-4bf3-b0df-e53b08fe3867

Assessments

CVSS by origin

8.7
cna@mongodb.comCVSS 4.0 · role Secondary · priority eligiblevalid_matchCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
7.5
cna@mongodb.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.7
mongodbCVSS 4.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5
mongodbCVSS 3.1 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Direct CVE/CNA normalized decisions

8.7Priority eligible

mongodb

CVSS 4.0 · Primary · Original assertion · rank 1

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
Validation
Valid match
Recomputed
8.7
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1
7.5Priority eligible

mongodb

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Validation
Valid match
Recomputed
7.5
Decision reason
Evidence supported
Policy
casca-direct-cvss-eligibility-v1

Assessments are retained side by side under closed precedence. Cascade never averages CVSS.

Evidence boundaries

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; remaining scope stays source-scoped.
  • NVD-carried upstream facts remain derivative; independent corroboration requires a separately authored source.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.
  • OSV aggregation and OSV-converted NVD material are not independent corroboration.
  • Red Hat facts are vendor assertions for the exact supplied products.
  • Nonmembership and not-yet-observed states are not proof of safety.