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CVE-2014-6321

81
FAUCET Score

CVE-2014-6321, also known as "Winshock," is a critical remote code execution vulnerability in Microsoft's Schannel security package, affecting numerous Windows operating systems from Server 2003 to Windows 8.1 and Server 2012 R2. With a CVSS score of 10.0, it allows unauthenticated remote attackers to execute arbitrary code with full system privileges by sending specially crafted packets. While there is no evidence of active exploitation in the KEV catalog or readily available public exploit code, the vulnerability has garnered significant community discussion, indicating awareness and potential for future exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_rt:-:*:*:*:*:*:*:*
Range not provided by sourceCPE matchmatch criteria
cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

10.0HIGH

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

Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
10.0
CvssVersion
2.0

Exploit Intelligence

EPSS Score
95.99%
Probability of exploitation in next 30 days
EPSS Percentile
99.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.9599 is in the 100th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

blog.beyondtrust.com / triggering-ms14-066
ExploitThird Party Advisory
marc.info
ExploitMailing ListThird Party Advisory
docs.microsoft.com / en-us/security-updates/securitybulletins/2014/ms14-066
PatchVendor Advisory
secunia.com / advisories/59800
Third Party Advisory
kb.cert.org / vuls/id/505120
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/70954
Third Party AdvisoryVDB Entry
securitysift.com / exploiting-ms14-066-cve-2014-6321-aka-winshock
ExploitThird Party Advisory
us-cert.gov / ncas/alerts/TA14-318A
Third Party AdvisoryUS Government Resource