CVE-2017-8495

Name: CVE-2017-8495
Creator: NVD / NIST
Published: 2017-07-11T21:29:00.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.62%

Last modified Jun 17, 2026

CVE-2017-8495 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 4.62% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

4.62%

90.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions	Update
Microsoft	Windows 10	All versions	—
Microsoft	Windows 10	1511	—
Microsoft	Windows 10	1607	—
Microsoft	Windows 10	1703	—
Microsoft	Windows 7	All versions	Sp1
Microsoft	Windows 8.1	All versions	—
Microsoft	Windows Rt 8.1	All versions	—
Microsoft	Windows Server 2008	All versions	Sp2
Microsoft	Windows Server 2008	r2	Sp1
Microsoft	Windows Server 2012	All versions	—
Microsoft	Windows Server 2012	r2	—
Microsoft	Windows Server 2016	All versions	—

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

Timeline

Published: Jul 11, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-8495?

How severe is CVE-2017-8495?

Severity scoring for CVE-2017-8495 is pending analysis. The EPSS model estimates a 4.62% probability of exploitation in the next 30 days.

How do I fix CVE-2017-8495?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-8495?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST