Microsoft WinVerifyTrust function Remote Code Execution

What it is

A remote code execution vulnerability exists in the way that the WinVerifyTrust function handles Windows Authenticode signature verification for PE files.

VulnCheck tracked exploitation 2722 days before CISA's KEV listing. VulnCheck's broader catalog of in-the-wild exploitation evidence picked this up before it landed on CISA's formal list. Per-CVE fact about this entry; not a population claim about lead time in general.

Who's affected

Affects anyone running Microsoft WinVerifyTrust function. Microsoft products in a small practice typically sit close to credentials, email, or document workflows — treat the patch as in-scope.

What to do

Apply updates per vendor instructions.

If you don't have someone in-house to verify the patch deployed across every endpoint — or you're not sure whether you're affected — that's exactly the kind of triage we do. Book a free 20-minute triage call.

Microsoft fix

No fixing KB is published yet in the Microsoft Security Update Guide for this CVE. Check Microsoft's advisory page directly if you need to verify whether an update has shipped.

Sourced from Microsoft Security Update Guide (CVRF document 2022-Jan).

CISA due date

Federal deadline: July 10, 2022.Federal agencies must complete the required action by this date. For private SMBs the deadline is advisory — but treat it as a strong recommendation, especially if you handle regulated data (HIPAA, GLBA, ABA model rules).

EPSS

EPSS score: 44.6% — higher than 99% of all scored CVEs.

EPSS estimates the probability of exploitation activity in the next 30 days. Every entry on this site is already confirmed exploited, so read it as relative urgency among the things you still have open, not as permission to wait.

Score dated 2026-07-09, from the FIRST.org Exploit Prediction Scoring System.

Browse more

• All Microsoft KEV entries
• All SMB-relevant KEV entries

Source

Pulled daily from the public cisagov/kev-data mirror (CC0). View the original entry on cisa.gov. CISA KEV is US-Government public-domain data; we add the SMB-vertical framing and the coping action above.