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Microsoft Defender Antivirus

Endpoint Security
Microsoft·Website

Built-in Windows antimalware — antimalware platform (client) version

Latest versions

StableWindows4.18.26080.3
Actively exploited
0
CISA KEV · 2 lifetime
Affecting latest
0
v4.18.26080.3
+26 unverified
Known CVEs
28
across all versions, as matched by PemSync
Last checked
6 Sep 2026, 0:15

Of 28 recorded CVEs, 2 are fixed in versions you're past. 26 could not be evaluated against 4.18.26080.3 — treat them as unknown rather than resolved. They are listed first in the table below.

CVESeverityEPSS pctStatusScore source
CVE-2021-1647Exploited
HIGH 7.899%Impact unverifiedNVD12 Jan 2021
CVE-2017-8540Exploited
HIGH 7.899%Impact unverifiedNVD26 May 2017
44%Impact unverified25 Feb 2021
52%Impact unverified14 Jul 2020
74%Impact unverified9 Jun 2020
56%Impact unverified9 Jun 2020
51%Impact unverified15 Apr 2020
58%Impact unverified15 Apr 2020
90%Impact unverified23 Sep 2019
57%Impact unverified14 Aug 2019
99%Impact unverified4 Apr 2018
99%Impact unverified29 Jun 2017
93%Impact unverified26 May 2017
99%Impact unverified26 May 2017
93%Impact unverified26 May 2017
99%Impact unverified26 May 2017
97%Impact unverified26 May 2017
97%Impact unverified26 May 2017
97%Impact unverified26 May 2017
100%Impact unverified9 May 2017
77%Impact unverified10 Jul 2013
77%Impact unverified9 Apr 2013
77%Impact unverified25 Feb 2011
96%Impact unverified13 May 2008
96%Impact unverified13 May 2008
Showing 125 of 28
Page 1 of 2

PemSync reports known, cataloged exploited vulnerabilities (CISA KEV) and published CVEs. It is not a zero-day detection or threat-intelligence system — a vulnerability may be exploited before it appears here. Absence of data does not mean an app is secure.

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