CVE-2017-11786 json
Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be re…
published 2017-10-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2017-3394
- cvss
- 8.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 9.4%
- EPSS 9.4% chance of exploitation in 30 days, percentile 95%
- public exploits
- 0
- none known
Summary
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."
Patch / fix
Exploit prediction
9.39% chance of exploitation in the next 30 days, higher than 95% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C |
Affected products
- Microsoft Corporation Skype for Business
Classification
- Weakness
-
- CWE-294 Authentication Bypass by Capture-replay
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2017-11786
patch, vendor-advisory
-
securityfocus.com
/bid/101156
vdb-entry, third-party-advisory
-
securitytracker.com
/id/1039530
vdb-entry, third-party-advisory
Sources
- CVE List CVE-2017-11786
- NVD CVE-2017-11786
Fencer Vulns 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.