VulnerabilityModified

CVE-2017-8495

HIGH 7.5EPSS 4.62%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (4.62%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

Microsoft Windows 7 SP1, Windows Server 2008 SP2 and R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allows an attacker to bypass Extended Protection for Authentication when Kerberos fails to prevent tampering with the SNAME field during ticket exchange, aka "Kerberos SNAME Security Feature Bypass Vulnerability" or Orpheus' Lyre.

CVSS 3.0: 7.5 HIGHCVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 4.62% probability · 92th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-287
Affected: microsoft/windows 10 · microsoft/windows 7 · microsoft/windows 8.1 · microsoft/windows rt 8.1 · microsoft/windows server 2008 · microsoft/windows server 2012 · microsoft/windows server 2016
Source: secure@microsoft.com

EPSS trend

EPSS 4.6% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

http://www.securityfocus.com/bid/99424Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038862Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495Patch, Vendor Advisory
https://www.orpheus-lyre.info/Third Party Advisory
http://www.securityfocus.com/bid/99424Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038862Third Party Advisory, VDB Entry
https://portal.msrc.microsoft.com/en-us/security-guidance/advisory/CVE-2017-8495Patch, Vendor Advisory
https://www.orpheus-lyre.info/Third Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.