CASCACascade Atlas

Evidence dossier

CVE-2025-40551

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

82.8–97.8Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

State
PUBLISHED
Published
Jan 28, 2026
Updated
Feb 26, 2026
Evidence coverage
85%
CISA KEVCatalog member

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

FIRST EPSS84.13%

2026-07-18 · v2026.06.15 · percentile 99.7%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

SolarWindsoriginal assertion
container

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability

CISA KEVoriginal assertion
observed_exploitation

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.841300000000; percentile 0.996660000000

Applicability

Cited product scope

Trace impact →
SolarWindsWeb Help Desk
[{"status": "affected", "version": "12.8.8 HF1 and below"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:solarwinds:web_help_desk:*:*:*:*:*:*:*:*; end excluding 2026.1supported

Assessments

CVSS by origin

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

Limitations and unknowns

  • 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; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • 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.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.