CVE-2017-8495 Security feature bypass in 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.

High 7.5 Published 11 Jul 2017 Updated 16 Sep 2024

Attackers can bypass Extended Protection for Authentication by tampering with the Kerberos SNAME field, affecting Microsoft Windows systems.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2017-8495?

CVE-2017-8495 is a high-severity vulnerability in Microsoft Windows 10, published on 11 Jul 2017. Any signed-in user can exploit it over the network, with no action from the victim.

Official 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.

Weakness: CWE-287

Which versions are affected by CVE-2017-8495?

It affects 7 products.

Products include Microsoft Windows 10, Microsoft Windows 7, Microsoft Windows 8.1, Microsoft Windows Rt 8.1, Microsoft Windows Server 2008, Microsoft Windows Server 2012 and 1 more.

How do I fix CVE-2017-8495?

No fix has been published for CVE-2017-8495 yet. Limit exposure of the affected software until one is available.

Is CVE-2017-8495 being exploited?

There is no known exploitation of CVE-2017-8495 in the wild and no public exploit code.

All Microsoft Windows 10 vulnerabilities

Sources

Also known as GHSA-95f7-rc94-rqj7.