CVE-2026-45498 kev in the critical feed json
Microsoft Defender Denial of Service Vulnerability
published 2026-05-20 5 mo ago modified 2026-08-10 2 mo ago also EUVD-2026-31102
- cvss
- 4.0
- version 3.1, CNA
- cisa kev
- Exploited
- added 2026-05-20
- epss
- 63.1%
- EPSS 63.1% chance of exploitation in 30 days, percentile 99.2%
- public exploits
- 0
- none known
Summary
Microsoft Defender Denial of Service Vulnerability
Patch / fix
cisa required action Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Microsoft Microsoft Defender Antimalware Platform 4.18.26040.7
Timeline
- Added to CISA KEV
- Published
- CISA SSVC: exploitation active
- CISA patch deadline
Known exploited
- Added
- 5 mo ago
- Patch by
- 2026-06-03 (5 mo ago)
- Ransomware
- Not known
- Required action
- Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Vendor, product
- Microsoft, Defender
- CISA name
- Microsoft Defender Denial of Service Vulnerability
CISA SSVC
- Exploitation
- Active, exploited in the wild
- Automatable
- no
- Technical impact
- partial
- Assessed
- 5 mo ago
Exploit prediction
63.08% chance of exploitation in the next 30 days, higher than 99.2% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.0 | 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 |
| CNA | 3.1 | 4.0 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
- Microsoft Microsoft Defender Antimalware Platform
Classification
- Weakness
-
- CWE-400 Uncontrolled Resource Consumption
References
-
msrc.microsoft.com
/update-guide/vulnerability/CVE-2026-45498
vendor-advisory, patch
-
cisa.gov
/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498
government-resource, third-party-advisory, us-government-resource
Sources
- CVE List CVE-2026-45498
- NVD CVE-2026-45498
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.