CASCACascade Atlas

Evidence dossier

CVE-2024-28986

SolarWinds Web Help Desk Java Deserialization Remote Code Execution Vulnerability

Exploited in the wild (CISA KEV since Aug 15, 2024). SolarWinds reports CVSS 3.1 9.8. EPSS estimates 84.6% exploit likelihood as of Aug 26, 2026.

85.5–88.2Priority evidence range
Evidence current through Aug 27, 2026, 6:09 PM UTC

As of Aug 27, 2026

Normalized restatement

SolarWinds Web Help Desk was found to be susceptible to a Java Deserialization Remote Code Execution vulnerability that, if exploited, would allow an attacker to run commands on the host machine. While it was reported as an unauthenticated vulnerability, SolarWinds has been unable to reproduce it without authentication after thorough testing. However, out of an abundance of caution, we recommend all Web Help Desk customers apply the patch, which is now available.

State
PUBLISHED
Published
Aug 13, 2024
Updated
Oct 21, 2025
Evidence coverage
92%

Evidence chronology

What was known when

Download this view's receipt →
  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
    SolarWinds

    Record text: SolarWinds Web Help Desk Java Deserialization Remote Code Execution Vulnerability

    Inspect raw assertion
    Field
    container
    Value
    SolarWinds Web Help Desk Java Deserialization Remote Code Execution Vulnerability
    Original evidence ↗
  3. Source dateFirst observed by CASCA
    CISA KEV

    Exploitation cataloged: SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

    Inspect raw assertion
    Field
    observed_exploitation
    Value
    SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
    Original evidence ↗
  4. Source dateFirst observed by CASCA
    FIRST EPSS

    EPSS score: 84.63% probability · 99.69th percentile

    Inspect raw assertion
    Field
    model_probability
    Value
    Probability 0.846280000000; percentile 0.996870000000
    Original evidence ↗
ExploitationCatalog member

CISA KEV · catalog date Aug 15, 2024 · first observed Jul 19, 2026

Exploit likelihood84.63%

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

SeverityCVSS 9.8

SolarWinds · 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 ↗
SolarWindsOriginal assertion
Record text

SolarWinds Web Help Desk Java Deserialization Remote Code Execution Vulnerability

Inspect raw assertion
Field
container
Value
SolarWinds Web Help Desk Java Deserialization Remote Code Execution Vulnerability
Source dateSource date omittedFirst observed by CASCAOriginal evidence ↗
CISA KEVOriginal assertion
Exploitation cataloged

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

Inspect raw assertion
Field
observed_exploitation
Value
SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Source dateFirst observed by CASCAOriginal evidence ↗
FIRST EPSSOriginal assertion
EPSS score

84.63% probability · 99.69th percentile

Inspect raw assertion
Field
model_probability
Value
Probability 0.846280000000; percentile 0.996870000000
Source dateFirst observed by CASCAOriginal evidence ↗

Applicability

Cited product scope

Trace impact →
2Underlying assertions
1Canonical products
2Target 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 assertedsolarwindswebhelpdeskDirect source scope
Affected: 0 through 12.8.3 (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": "12.8.3"}]
SolarWinds · source assertedSolarWindsWeb Help DeskDirect source scope
Affected: previous versions through 12.8.3 (12.8.3 comparison)
Source-reported scope

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

Inspect raw assertion[{"status": "affected", "version": "previous versions", "versionType": "12.8.3", "lessThanOrEqual": "12.8.3"}]
NVD CPE · APPLICATIONsolarwindsweb_help_deskVulnerable target · 2 assertions
Any version (unconstrained) (<= 12.8.2); Version 12.8.3Canonical identity product-40829529b05cdb61ecbaa42e76f650c54c56e9caa25bf81b375909ef6d0ed843Linked exact
Scope supported
Inspect raw assertions
  1. cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 0
    Logic
    OR
    Version bounds
    through including 12.8.2
    Match ID
    5426a720-f345-4c8e-b5b5-76639d447a6d
  2. cpe:2.3:a:solarwinds:web_help_desk:12.8.3:-:*:*:*:*:*:*
    Official link
    Linked exact
    Role
    Vulnerable target
    Configuration
    0 · node/0 · match 1
    Logic
    OR
    Version bounds
    No explicit bounds
    Match ID
    331bf887-f099-419e-9664-ee2ec76e2e23

Affected-product evidence

Accepted scope and product mapping

1 canonical links · 1 source-reported links

Mapping establishedEvidence supported

vendor-391e7faeab524390123e1ed5f782756e82c750d283ae0f54737c4a4dc9612f6d · product-40829529b05cdb61ecbaa42e76f650c54c56e9caa25bf81b375909ef6d0ed843

Source class
Nvd cpe vulnerable target
Assertions
2
Mapping revision
cpe23-exact-mapping-v1
Observed cutoff
Aug 27, 2026
Retained assertion IDs
488812d7-cd33-4315-b316-e764702e7755970679b1-b857-42ce-b137-20302a35740c
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
1e183104-395b-4331-b65c-ffffcbb631b35a6977a8-6b25-41b9-8969-27549716c9b5

Assessments

CVSS by origin

9.8
psirt@solarwinds.comCVSS 3.1 · role Secondary · priority eligiblevalid_matchCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
SolarWindsCVSS 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:H/A:H

Direct CVE/CNA normalized decisions

9.8Priority eligible

SolarWinds

CVSS 3.1 · Primary · Original assertion · rank 1

CVSS:3.1/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.