Improper input validation in Microsoft Lync
CVE-2020-1025
An elevation of privilege vulnerability exists when Microsoft SharePoint Server and Skype for Business Server improperly handle OAuth token validation. An attacker who successfully exploited the vulnerability could bypass authentication and achieve improper access. To exploit this vulnerability, an attacker would need to modify the token. The update addresses the vulnerability by modifying how Microsoft SharePoint Server and Skype for Business Server validate tokens.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.059 (93.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.059 · newest: 0.059 · change: 0.000
Affected products
- Microsoft Lync — versions 2013
- Microsoft Lync Server 2013 — versions 0
- Microsoft Sharepoint Enterprise Server 2016 — versions 16.0.0
- Microsoft Sharepoint Foundation 2013 Service Pack 1 — versions 15.0.0
- Microsoft Sharepoint Server 2019 — versions 16.0.0
- Microsoft Sharepoint Enterprise Server — versions 2016
- Microsoft Sharepoint Foundation — versions 2013
- Microsoft Sharepoint Server — versions 2019
- Microsoft Skype For Business — versions 2015, 2019
- Microsoft Skype For Business Server 2015 Cu 8 — versions 2015 CU 8
Weakness classification (CWE)
References
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1025 (Patch, Vendor Advisory)
Frequently asked questions
- What is CVE-2020-1025?
- CVE-2020-1025 is a critical-severity vulnerability in Microsoft Lync, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-07-14.
- How severe is CVE-2020-1025?
- Critical severity. CVSS v3 base score is 9.8 out of 10.