CASCACascade Atlas

Evidence dossier

CVE-2026-45498

Microsoft Defender Denial of Service Vulnerability

65.9–89.6Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

Microsoft Defender Denial of Service Vulnerability

State
PUBLISHED
Published
May 20, 2026
Updated
Jun 19, 2026
Evidence coverage
72%
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 EPSS63.08%

2026-07-18 · v2026.06.15 · percentile 99.1%

Source stateConflict visible

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

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

microsoftoriginal assertion
container

Microsoft Defender Denial of Service Vulnerability

CISA KEVoriginal assertion
observed_exploitation

Microsoft Defender Denial of Service Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.630760000000; percentile 0.991100000000

Applicability

Cited product scope

Trace impact →
MicrosoftMicrosoft Defender Antimalware Platform
[{"status": "affected", "version": "4.0.0.0", "lessThan": "4.18.26040.7", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:microsoft:defender_antimalware_platform:*:*:*:*:*:*:*:*; end excluding 4.18.26040.7supported

Assessments

CVSS by origin

7.5
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0
secure@microsoft.comCVSS 3.1 · role SecondaryCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
4.0
microsoftCVSS 3.1 · role unknownCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C

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.