CVE-2026-45498
HIGHCVSS 7.5/10Actively ExploitedEPSS 63.08%
Last modified
CVE-2026-45498 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Microsoft Defender Denial of Service Vulnerability. CISA has confirmed active exploitation in the wild. EPSS estimates a 63.08% chance of exploitation in the next 30 days.
Description
Microsoft Defender Denial of Service Vulnerability
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Defender Antimalware Platform | < 4.18.26040.7 |
References
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-45498?
Microsoft Defender Denial of Service Vulnerability
How severe is CVE-2026-45498?
CVE-2026-45498 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 63.08% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.
How do I fix CVE-2026-45498?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-45498?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST