Vulnerability in Microsoft Lync
CVE-2017-11786
Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.094 (95.4th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 95.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.094 · newest: 0.094 · change: 0.000
Affected products
- Microsoft Lync — versions 2013
- Microsoft Skype For Business — versions 2016
- Microsoft Corporation Skype For Business — versions Microsoft Lync 2013 SP1 and Skype for Business 2016
Weakness classification (CWE)
Public proof-of-concept exploits
References
- www.securityfocus.com/bid/101156 (VDB Entry, Third Party Advisory, vdb-entry)
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786 (Patch, Vendor Advisory)
- www.securitytracker.com/id/1039530 (VDB Entry, Third Party Advisory, vdb-entry)
Frequently asked questions
- What is CVE-2017-11786?
- CVE-2017-11786 is a high-severity vulnerability in Microsoft Lync, classified under Authentication Bypass by Capture-replay. CVSS score: 8.8/10. Published 2017-10-13.
- How severe is CVE-2017-11786?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2017-11786 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.