CASCACascade Atlas

Evidence dossier

CVE-2024-40711

A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

Exploited in the wild (CISA KEV since Oct 17, 2024). NVD reports CVSS 3.1 9.8. EPSS estimates 90.4% exploit likelihood as of Aug 26, 2026.

86.2–88.8Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

State
PUBLISHED
Published
Sep 7, 2024
Updated
Oct 21, 2025
Evidence coverage
90%

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

    Inspect raw assertion
    Field
    container
    Value
    CISA ADP Vulnrichment
    Original evidence ↗
  2. Source dateSource date omittedFirst observed by CASCA
    hackerone

    Record text: A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

    Inspect raw assertion
    Field
    container
    Value
    A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: Veeam Backup and Replication Deserialization Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    Veeam Backup and Replication Deserialization Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 90.37% probability · 99.79th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.903690000000; percentile 0.997890000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Oct 17, 2024 · first observed Jul 19, 2026

Exploit likelihood90.37%

FIRST EPSS · score date Aug 26, 2026 · 99.8th percentile · first observed Aug 26, 2026

SeverityCVSS 9.8

NVD · CVSS 3.1 · 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

Inspect raw assertion
Field
container
Value
CISA ADP Vulnrichment
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
hackeroneOriginal assertion
Record text

A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).

Inspect raw assertion
Field
container
Value
A deserialization of untrusted data vulnerability with a malicious payload can allow an unauthenticated remote code execution (RCE).
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

Veeam Backup and Replication Deserialization Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
Veeam Backup and Replication Deserialization Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

90.37% probability · 99.79th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.903690000000; percentile 0.997890000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
1Underlying assertions
1Canonical products
1Target 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

3 scope groups

CISA-ADP · source assertedveeambackup_\&_replicationDirect source scope
Affected: 0 through 12.2.0.334 (custom comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "12.2.0.334"}]
hackerone · source assertedVeeamBackup and RecoveryDirect source scope
Affected: 12.1.2 through 12.1.2 (semver comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "12.1.2", "versionType": "semver", "lessThanOrEqual": "12.1.2"}]
NVD CPE · APPLICATIONveeamveeam_backup_&_replicationVulnerable target · 1 assertions
Any version (unconstrained) (>= 12.0.0.1420, < 12.2.0.334)Canonical identity product-4ca0c9ca76ce25c8ab3fc111e7891d840034db35d7ea3add60a2990a60473a79Linked exact
Scope supported
Inspect raw assertion
  1. cpe:2.3:a:veeam:veeam_backup_\&_replication:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    from including 12.0.0.1420; through excluding 12.2.0.334
    Match ID
    e3ad538f-6d77-4528-9bd8-c06e1cd65354

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-acc9e78eb332d4adec4ddd85e2956638ab6a8c581e840b238feb2aebc007bf66 · product-4ca0c9ca76ce25c8ab3fc111e7891d840034db35d7ea3add60a2990a60473a79

Source class
Nvd cpe vulnerable target
Assertions
1
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
03c16630-758f-4118-9365-a8720e816a5a
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
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
12e7cc1e-8f44-4033-a0b5-950f363dfedae5086b39-c07f-44de-b629-d4c2ca5f0f72

Assessments

CVSS by origin

9.8
NVDCVSS 3.1 · role Primary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
support@hackerone.comCVSS 3.0 · role Secondary · priority eligiblevalid_matchCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
hackeroneCVSS 3.0 · role unknown · display onlyDirect record assessment retained outside normalized eligibilityCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Direct CVE/CNA normalized decisions

9.8Priority eligible

hackerone

CVSS 3.0 · Primary · Original assertion · rank 1

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Validation
Valid match
Recomputed
9.8
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.