HIGH
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 Oct 13, 2017
8.8
HIGHCVSS 3.0
EPSS 9.39%
Description
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."
Affected products
-
- Version Microsoft Lync 2013 SP1 and Skype for Business 2016StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft Corporation | Skype for Business | n/a |
|
OR
- 2013
- 2016
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
8.8 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
9.3 HIGH NVD
AV:N/AC:M/Au:N/C:C/I:C/A:C
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
9.39% 0.09392
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.09392
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (51 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 9.39% (0.09392) | 95.26th | v5 (v2026.06.15) |
| Sep 22, 2026 | 9.39% (0.09392) | 95.18th | v5 (v2026.06.15) |
| Sep 21, 2026 | 8.13% (0.08127) | 94.67th | v5 (v2026.06.15) |
| Sep 6, 2026 | 9.39% (0.09392) | 95.07th | v5 (v2026.06.15) |
| Sep 5, 2026 | 8.13% (0.08127) | 94.55th | v5 (v2026.06.15) |
| Aug 30, 2026 | 9.39% (0.09392) | 95.04th | v5 (v2026.06.15) |
| Aug 28, 2026 | 8.13% (0.08127) | 94.51th | v5 (v2026.06.15) |
| Aug 24, 2026 | 9.39% (0.09392) | 95.01th | v5 (v2026.06.15) |
| Aug 23, 2026 | 8.13% (0.08127) | 94.49th | v5 (v2026.06.15) |
| Jun 15, 2026 | 9.39% (0.09392) | 94.75th | v5 (v2026.06.15) |
| Mar 4, 2026 | 11.49% (0.11493) | 93.48th | v4 (v2025.03.14) |
| Mar 1, 2026 | 20.05% (0.20046) | 95.39th | v4 (v2025.03.14) |
| Feb 4, 2026 | 11.49% (0.11493) | 93.44th | v4 (v2025.03.14) |
| Feb 1, 2026 | 20.05% (0.20046) | 95.35th | v4 (v2025.03.14) |
| Jan 4, 2026 | 11.49% (0.11493) | 93.38th | v4 (v2025.03.14) |
| Jan 1, 2026 | 20.05% (0.20046) | 95.33th | v4 (v2025.03.14) |
| Dec 4, 2025 | 11.49% (0.11493) | 93.34th | v4 (v2025.03.14) |
| Dec 1, 2025 | 20.05% (0.20046) | 95.29th | v4 (v2025.03.14) |
| Nov 4, 2025 | 11.49% (0.11493) | 93.30th | v4 (v2025.03.14) |
| Nov 1, 2025 | 20.05% (0.20046) | 95.27th | v4 (v2025.03.14) |
| Oct 4, 2025 | 11.49% (0.11493) | 93.33th | v4 (v2025.03.14) |
| Oct 1, 2025 | 20.05% (0.20046) | 95.32th | v4 (v2025.03.14) |
| Sep 6, 2025 | 11.49% (0.11493) | 93.36th | v4 (v2025.03.14) |
| Sep 1, 2025 | 20.05% (0.20046) | 95.30th | v4 (v2025.03.14) |
| Aug 4, 2025 | 11.49% (0.11493) | 93.33th | v4 (v2025.03.14) |
| Aug 1, 2025 | 20.05% (0.20046) | 95.28th | v4 (v2025.03.14) |
| Jul 6, 2025 | 11.49% (0.11493) | 93.27th | v4 (v2025.03.14) |
| Jul 5, 2025 | 20.05% (0.20046) | 95.20th | v4 (v2025.03.14) |
| Jul 1, 2025 | 15.79% (0.15791) | 94.45th | v4 (v2025.03.14) |
| Jun 6, 2025 | 8.80% (0.08801) | 92.05th | v4 (v2025.03.14) |
| Jun 1, 2025 | 15.79% (0.15791) | 94.41th | v4 (v2025.03.14) |
| May 4, 2025 | 8.80% (0.08801) | 92.03th | v4 (v2025.03.14) |
| May 1, 2025 | 15.79% (0.15791) | 94.37th | v4 (v2025.03.14) |
| Apr 13, 2025 | 9.22% (0.09221) | 91.97th | v4 (v2025.03.14) |
| Apr 12, 2025 | 16.47% (0.16470) | 94.34th | v4 (v2025.03.14) |
| Apr 2, 2025 | 9.22% (0.09221) | 91.98th | v4 (v2025.03.14) |
| Apr 1, 2025 | 16.47% (0.16470) | 94.33th | v4 (v2025.03.14) |
| Mar 30, 2025 | 9.72% (0.09717) | 92.18th | v4 (v2025.03.14) |
| Mar 29, 2025 | 8.30% (0.08297) | 86.84th | v4 (v2025.03.14) |
| Mar 25, 2025 | 9.72% (0.09717) | 92.12th | v4 (v2025.03.14) |
| Mar 24, 2025 | 13.48% (0.13476) | 93.58th | v4 (v2025.03.14) |
| Mar 18, 2025 | 9.72% (0.09717) | 92.39th | v4 (v2025.03.14) |
| Mar 17, 2025 | 13.48% (0.13476) | 93.67th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.59% (0.00594) | 79.07th | v3 (v2023.03.01) |
| Feb 8, 2024 | 0.59% (0.00594) | 77.67th | v3 (v2023.03.01) |
| Sep 3, 2023 | 0.59% (0.00594) | 75.63th | v3 (v2023.03.01) |
| Mar 7, 2023 | 1.05% (0.01050) | 81.73th | v3 (v2023.03.01) |
| Mar 6, 2023 | 10.46% (0.10457) | 94.63th | v2 (v2022.01.01) |
| Feb 4, 2022 | 10.46% (0.10457) | 87.68th | v2 (v2022.01.01) |
| Feb 3, 2022 | 8.76% (0.08756) | 86.41th | v5 (v2026.06.15) |
| Apr 14, 2021 | 8.76% (0.08756) | 0.00th | v1 |
Weaknesses (1)
References (3)
- http://www.securityfocus.com/bid/101156 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039530 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786 x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/101156 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1039530 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786 | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Oct 13, 2017
Updated Sep 16, 2024
Reserved Jul 31, 2017
Link CVE-2017-11786
CISA Vulnrichment
Updated n/a