Which products and versions are affected by CVE-2014-6321?

Affected: Windows 7 (Microsoft); Windows 8 (Microsoft); Windows 8.1 (Microsoft), among others. The full list is in the CVE brief.

Is CVE-2014-6321 being exploited in the wild?

It is exploited in the wild, listed in Industry KEV feed since Mar 23, 2026.

Is CVE-2014-6321 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2014-6321?

No public exploit code is known.

Is there a fix for CVE-2014-6321?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2014-6321 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2014-6321

CriticalExploited

Schannel in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code via crafted packets, aka…

Published Nov 11, 2014 · Updated May 6, 2026

Key Facts

Patch immediately

CVE-2014-6321 is a critical-severity vulnerability (CVSS 10.0 v2) affecting Windows 7 (Microsoft), Windows 8 (Microsoft), Windows 8.1 (Microsoft) and 6 more products.
It is exploited in the wild, listed in Industry KEV feed since Mar 23, 2026. No public exploit code is known.
EPSS estimates a 96% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v2

10.0

AV:N/AC:L/Au:N/C:C/I:C/A:C

EPSS (30-day exploit likelihood)

96%

Higher than 99.8% of all scored CVEs

Exploited in the wild

Yes

1 catalog listing

Public exploit code

None known

Get the full CVE-2014-6321 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
Industry KEV feed	Mar 23, 2026	n/a	Not reported

Required action: Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

Affected Products

12 affected entries in total

Product	Affected versions	Fixed in
Windows 7Microsoft	See advisory	n/a
Windows 8Microsoft	See advisory	n/a
Windows 8.1Microsoft	See advisory	n/a
Windows RtMicrosoft	See advisory	n/a
Windows Rt 8.1Microsoft	See advisory	n/a

4 more affected products in the full CVE brief

Timeline

Publicly disclosed
Nov 11, 2014
Added to Industry KEV feed
Mar 23, 2026
Last updated
May 6, 2026

Weakness Type

CWE-94 Improper Control of Generation of Code ('Code Injection')

References

advisory59800
advisoryVU#505120
advisory70954
advisoryTA14-318A
patchMS14-066

4 more references in the full CVE brief

FAQ

Common Questions.

Schannel in Microsoft Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows 7 SP1, Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows remote attackers to execute arbitrary code via crafted packets, aka "Microsoft Schannel Remote Code Execution…
Affected: Windows 7 (Microsoft); Windows 8 (Microsoft); Windows 8.1 (Microsoft), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Mar 23, 2026.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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