Vulnerability details
CVE-2026-45498
Actively exploited
Microsoft Defender Antimalware Platform
Microsoft Defender Denial of Service Vulnerability
CVSS 3.1
4.0Medium
Official description
Microsoft Defender Denial of Service Vulnerability
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 4.0Medium | 3.1 | CVEProject cvelistV5 (CNA) (microsoft) | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Microsoft | Microsoft Defender Antimalware Platform | 4.0.0.0 ≤ v < 4.18.26040.7 | CVEProject cvelistV5 (CNA) |
References and advisories
2- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 vendor-advisorypatch
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498 government-resource
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Details
- Published
- 2026-05-20
- Last updated
- 2026-08-10
- State
- Published
- Assigner (CNA)
- microsoft
- Kolun priority
- 81 · Critical
CISA KEV catalog
- Date added
- 2026-05-20
- Due date
- 2026-06-03
- Used in ransomware
- Unknown
Exploit prediction (EPSS)
63.07%
Probability of exploitation in 30 days
99.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- Active
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-400Uncontrolled Resource Consumption