CVE-2026-45498
Microsoft Defender Denial of Service Vulnerability
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Listed in CISA KEV
- Fix
- Fixed in 4.18.26040.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Microsoft Defender, Microsoft's built-in antivirus and endpoint protection software, is affected by a vulnerability that could allow an attacker to cause a denial of service. This could disrupt the software's normal operation, potentially making the protected system less secure or unavailable until the issue is addressed.
Summarized by anthropic/claude-haiku-5.5. Verify details against the original sources.
Read the original description
Microsoft Defender Denial of Service Vulnerability
Timeline
- Added to CISA KEV
CISA has evidence of exploitation in the wild
- CVE published
- CISA remediation deadline
Due date for US federal agencies to patch
- Record last updated
Affected versions
- Microsoft Microsoft Defender Antimalware Platform
From 4.0.0.0 · fixed in 4.18.26040.7