IPSec in Microsoft Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 mishandle…

published 2015-11-11 10y ago modified 2026-06-17 4mo ago also EUVD-2015-6054

cvss: 6.8; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 7.8%; EPSS 7.8% chance of exploitation in 30 days, percentile 94%
public exploits: 0; none known

IPSec in Microsoft Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, Windows RT Gold and 8.1, and Windows 10 Gold and 1511 mishandles encryption negotiation, which allows remote authenticated users to cause a denial of service (system hang) via crafted IP traffic, aka "Windows IPSec Denial of Service Vulnerability."

Patch / fix

links 1

docs.microsoft.com/en-us/security-updates/securitybulletins/2015/ms15-120 advisory

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Exploit prediction

7.79% chance of exploitation in the next 30 days, higher than 94% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
NVD	2.0	6.8	AV:N/AC:L/Au:S/C:N/I:N/A:C

Classification

Weakness

CWE-399 Resource Management Errors

References

docs.microsoft.com /en-us/security-updates/securitybulletins/2015/ms15-120
vendor-advisory, patch
securitytracker.com /id/1034123
vdb-entry, third-party-advisory

Sources

CVE List CVE-2015-6111
NVD CVE-2015-6111

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.