CVE-2026-45498

high

Description

Microsoft Defender Denial of Service Vulnerability

References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498

https://www.securityweek.com/microsoft-working-on-patch-for-rogueplanet-zero-day/

https://thehackernews.com/2026/06/microsoft-confirms-rogueplanet-defender_02022423645.html

https://www.securityweek.com/new-windows-zero-day-exploit-rogueplanet-released/

https://thehackernews.com/2026/06/microsoft-defender-rogueplanet-zero-day.html

https://www.infosecurity-magazine.com/news/microsoft-uncoordinated-zeroday/

https://thehackernews.com/2026/05/microsoft-slams-public-zero-day.html

https://www.securityweek.com/microsoft-patches-exploited-undefend-and-redsun-defender-zero-days/

https://www.helpnetsecurity.com/2026/05/21/microsoft-defender-vulnerabilities-cve-2026-41091-cve-2026-45498/

https://www.bleepingcomputer.com/news/security/microsoft-warns-of-new-defender-zero-days-exploited-in-attacks/

https://thehackernews.com/2026/05/microsoft-warns-of-two-actively.html

https://securityaffairs.com/192508/security/u-s-cisa-adds-microsoft-and-adobe-flaws-to-its-known-exploited-vulnerabilities-catalog.html

https://www.cisa.gov/news-events/alerts/2026/05/20/cisa-adds-seven-known-exploited-vulnerabilities-catalog

https://securityaffairs.com/193436/security/chaotic-eclipse-unveils-rogueplanet-exploit-targeting-fully-patched-windows.html

https://www.bleepingcomputer.com/news/microsoft/critical-windows-netlogon-remote-code-execution-flaw-now-exploited-in-attacks/

https://www.darkreading.com/cyberattacks-data-breaches/exploits-turn-windows-defender-attacker-tool

https://deadeclipse666.blogspot.com/2026/04/funny-dos-tool.html

Details

Source: Mitre, NVD

Published: 2026-05-20

Updated: 2026-05-28

Named Vulnerability: UnDefendKnown Exploited Vulnerability (KEV)

Risk Information

CVSS v2

Base Score: 7.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

EPSS

EPSS: 0.02271

Vulnerability Watch

Tenable Research has classified this CVE under the following Vulnerability Watch classification, which includes active and historical (inactive) classifications. You can learn more about these classifications on our blog.

Vulnerability of Interest